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Best Bifocal Safety Glasses Reviewed & Rated for Quality

last updated Mar 07, 2019

Safety in the workplace is critically important which is why many companies make plenty of investments in order to make sure that the workplace is safe. Such investments may include personal protective equipment such as steel-toed boots, safety glasses, gloves, or other such equipment. Even if you do not need to own personal protection equipment for your job, there are plenty of reasons to own basic items such as safety glasses and work boots and everyone’s vision is different which is why some people need safety glasses that have a bifocal lens. But many people are ending up confused since there is more than enough choices on the market when it comes to safety glasses, and that’s why we’ve made a list that will help you to be able to find a pair that is best suited to your needs.

In a Hurry? The test winner after 14 hrs of research

icon
Dewalt DPG59-120C
97.5/100 our score
Comfort
97
Durability
97
UV Protection
98
Visibility
98
Dewalt DPG59-120C
Why is it better?

The lenses are made of polycarbonate to help resist scratches.

They are impact resistant so your eyes and face are protected.

The temple area is ergonomically designed for comfort and grip.

The magnification lens (diopter) is built into the main lens.

You can purchase it in different lens colors depending on your needs.

In a Hurry? Editors choice:
Dewalt DPG59-120C
Test Winner: Dewalt DPG59-120C
Researched Sources
8
Researched Sources
Reviews Considered
35
Reviews Considered
Hours Researching
14
Hours Researching
Products Evaluated
30
Products Evaluated
Sorting Options
Comfort Durability UV Protection Visibility Versatility By Default
Rank
PictureProduct
Name
Rating
Shops
#1
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
97.5
Comfort
97%
Durability
97%
UV Protection
98%
Visibility
98%
Price Comparison Last Updated (19.05.19)
$11.07
#2
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
95.5
Comfort
97%
Durability
94%
UV Protection
96%
Visibility
95%
Price Comparison Last Updated (19.05.19)
$9.95
#3
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
94.3
Comfort
93%
Durability
95%
UV Protection
94%
Versatility
95%
Price Comparison Last Updated (19.05.19)
$9.15
#4
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92.8
Comfort
95%
Durability
93%
UV Protection
93%
Visibility
90%
Price Comparison Last Updated (19.05.19)
$10.00
#5
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.8
Comfort
90%
Durability
89%
UV Protection
92%
Visibility
88%
Price Comparison Last Updated (19.05.19)
$13.99
#6
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.3
Comfort
88%
Durability
86%
UV Protection
89%
Visibility
86%
Price Comparison Last Updated (19.05.19)
$9.56
#7
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86
Comfort
86%
Durability
85%
UV Protection
88%
Visibility
85%
Price Comparison Last Updated (19.05.19)
$12.20
#8
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
83
Comfort
83%
Durability
84%
UV Protection
82%
Visibility
83%
Price Comparison Last Updated (19.05.19)
$18.99
#9
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
79.3
Comfort
80%
Durability
75%
UV Protection
81%
Visibility
81%
Price Comparison Last Updated (19.05.19)
$30.14
#10
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
76.8
Comfort
78%
Durability
77%
UV Protection
76%
Visibility
76%
Price Comparison Last Updated (19.05.19)
$9.56
In Depth Review Top 10
  • Dewalt DPG59-120C
  • Calabria 91348
  • Elvex RX-350C
  • Phillips Safety SB-9000
  • grinderPUNCH
  • Radians C2-115
  • 3M BX
  • proSPORTsunglasses
  • SSP Eyewear
  • Radians C2-120
Table of contents
  • Criteria Used for Evaluation
  • Other Factors to Consider
  • Frequently Asked Questions

10 Best Bifocal Safety Glasses

1. Dewalt DPG59-120C

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
97.5
Dewalt DPG59-120C
Comfort
97
Durability
97
UV Protection
98
Visibility
98
best offer for today
$11.07
Pros:

The lenses are made of polycarbonate to help resist scratches.

They are impact resistant so your eyes and face are protected.

The temple area is ergonomically designed for comfort and grip.

The magnification lens (diopter) is built into the main lens.

You can purchase it in different lens colors depending on your needs.

Cons:

Some users have reported that they scratch easier than they should.

The protective sleeve is tight and makes it hard to use.

Dewalt is a brand that has a reputation for being tuff around the job site. That's why it makes sense to consider a pair of eye protection glasses made by the company. These glasses are strong and durable yet they are also comfortable enough to wear throughout the entire workday without bothering the side of your head, ears, or your nose.

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Eye strain is one reason why some people are resistant to wear safety glasses which is why these glasses are distortion free. This will help to reduce eye strain and make it easier to see.

UV radiation can cause eye disease which is why it is important to own a pair of glasses that protect your eyes. These glasses block 99.9% of harmful UV radiation.

You can purchase the DPG59-12C at a price that is slightly above the average price. The small increase in price is due to the higher end materials used to make them so they provide a great value.

2. Calabria 91348

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
95.5
Calabria 91348
Comfort
97
Durability
94
UV Protection
96
Visibility
95
best offer for today
$9.95
Pros:

The lenses are made of polycarbonate which resists scratching.

They are shatterproof which helps increase safety and protection.

You can pick a magnification option that is best suited to your needs.

The lenses are sold in five different color options for different lighting conditions.

The frame is made of nylon and is strong yet lightweight.

Cons:

Reviewers have reported that the nose pads can come off too easily.

The bifocal area can be off for some users making it hard to use.

The 91348 model safety glasses by Calabria is another great choice for when you are looking for an excellent pair of work glasses. These glasses feature a lightweight frame that will help them sit comfortably on your face so that you will forget that you are even wearing them in the first place. There plenty of different magnification and color options available as well.

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Since everyone's eyes are different, the Calabria safety glasses are sold in different magnification options so that you can pick the strength that is best for your eyes which will help you see the best.

You can purchase the lenses in any one of the five different color options. The different lens colors can help you see better in certain light conditions which is why it's helpful to have choices.

You can purchase a pair of these safety glasses at an average price. This makes it into an excellent value for anyone that is looking for a pair of fairly priced safety glasses.

3. Elvex RX-350C

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
94.3
Elvex RX-350C
Comfort
93
Durability
95
UV Protection
94
Versatility
95
best offer for today
$9.15
Pros:

The temples are rubberized so they will stay on your face.

The glasses are lightweight which helps make them more comfortable.

The nose area is ventilated so that it breathes well.

The polycarbonate lenses are shatterproof and resist high impacts to your face.

You can adjust the nose bridge as needed for additional comfort.

Cons:

The bifocal area is small and can be hard to use.

Some people have reported that they can pinch the sides of your head.

Elvex is another reputable brand that offers you industrial strength safety glasses. These glasses have been designed to have a stylish look while maintaining safety and comfort. These are perfect to use for jobs where you need to look at fine details such as machining, grinding, or even doing crafts or jewelry work. You can trust these glasses to keep you safe and comfortable all day long.

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The temple area of the glasses is rubberized which helps to maintain comfort by gripping the side of your head without using an excessive amount of pressure. They also make the tips more durable.

The nose area is vented for additional comfort. The ventilation keeps sweat from pooling up on your nose and it also helps to keep the glasses from fogging up while you are wearing them.

You will be able to purchase the RX-350C glasses at a price that is a little lower than the average price. This makes them into a great choice since they are high quality at a lower price.

4. Phillips Safety SB-9000

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92.8
Phillips Safety SB-9000
Comfort
95
Durability
93
UV Protection
93
Visibility
90
best offer for today
$10.00
Pros:

The lenses are yellow which enhances contrast and helps you see better.

Both lenses are impact resistant since they are made of polycarbonate.

These safety glasses meet the ANSI Z87.1-2003 standard for safety.

The nose bridge is made of a soft rubber material.

You can use the temple inserts to provide you with additional comfort.

Cons:

The bifocal lenses can be difficult to see through and focus.

The glasses can fog up under certain conditions which reduces visibility.

The SB-9000 is an ANSI Z87.1-2003 compliant pair of workplace safety glasses. This makes them ideal to use in situations where you have to make sure that you have the best eye protection in order to work safely. They have lots of other features that you would expect to find in a high-quality pair of glasses which makes them a great value.

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The nose bridge is made of rubber. This will help the glasses sit comfortably on your nose without your nose developing bumps, sores, or other signs of irritation. The rubber also helps to keep the glasses in place.

You can use the temple inserts to help make sure that the glasses feel good on the sides of your head. They will also help keep the glasses secure without pinching your head.

You will be able to purchase a pair of these glasses at an average price. This makes them into an excellent value since you get high-quality glasses without spending a premium on them.

5. grinderPUNCH

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.8
grinderPUNCH
Comfort
90
Durability
89
UV Protection
92
Visibility
88
best offer for today
$13.99
Pros:

There are five different magnification choices that you can pick from.

The lense offer 100% UV protection against UVA and UVB radiation.

There is a cleaning pouch that is made of microfiber.

The end tips and the nose are made of rubber.

The lenses are made of polycarbonate and are ANSI certified.

Cons:

The bifocal lens is in an odd position which makes it hard to see.

The nose piece can get in the way of your vision.

The glasses made by grinderPUNCH are great for people who work outside. These glasses provide you with protection from UV radiation (both UVA and UVB) to help protect you from eye disease later in life. Furthermore, the lenses are ANSI certified for safety and these glasses even come with a cleaning microfiber that will help you remove dirt and dust without scratching them.

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The glasses are sold with a cleaning pouch that you can use to store the glasses and keep them clean when you are not using them. This will help the glasses last longer.

It is important that you protect your eyes from UV radiation so that you don't develop eye disease. These classes offer you 100% protection against both UVA and UVB radiation.

You will be able to purchase this item at a price that is slightly higher than the average price. This higher price is due to them being sold in a pair of two which increase the value.

6. Radians C2-115

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.3
Radians C2-115
Comfort
88
Durability
86
UV Protection
89
Visibility
86
best offer for today
$9.56
Pros:

There are rubberized temple pads that will provide you with excellent comfort.

The lenses block almost all UV radiation making them ideal for outside.

You can work safely since they conform to the ANSI Z87.1 standard.

The nose piece is made of a soft rubber material for comfort.

They have been designed to resist breaking and scratching for durability.

Cons:

The nose bridge is narrow and can be uncomfortable for people with large noses.

The bifocal lens is located at the very bottom, making it hard to see.

It's nice to have reading glasses and safety glasses built into the same pair of glasses and Radians does an excellent job of it with the C2-115. This pair of glasses meets ANSI standards and will provide you with almost complete protection from UVA and UVB radiation. They are designed to feel comfortable all day long so that you can wear them through the entire workday.

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The temple pads are made of a rubber that is non-slip to keep the glasses from falling off of your face. This makes them ideal for all-day wear since they won't pinch your head.

The C2-115 complies with the ANSI Z87.1 standard. This means that you can trust that you can work safely while you are wearing these safety glasses since they have been tested to protect against common hazards.

You can purchase a pair of the C2-115 glasses at a price that is slightly lower than the average price. This makes them into an affordable option for a pair of high-quality glasses.

7. BX

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86
 BX
Comfort
86
Durability
85
UV Protection
88
Visibility
85
best offer for today
$12.20
Pros:

The lenses have an anti-fog coating to help you see.

There are magnifying diopters on the lower and upper lens.

The nose bridge is soft and designed to stay comfortable all day long.

The lens absorbs almost all UV radiation making them great for outdoor use.

They comfort with CSA Z94.3 and ANSI Z87.1 standards for safety.

Cons:

The lower the lens can be too high which can make it hard to see.

The anti-fog coating can wear off after a while which can cause fogging after a while.

Since 3M is a leader in material science, you can trust that they will make a pair of high-quality safety glasses that you can count on in order to make sure that you can work safely and comfortably. These glasses comfort to ANSI standards and feature a lightweight yet durable polycarbonate lens. The nose bridge and temples have been designed for comfort so that you can wear them throughout your workday.

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Fog on the lenses is a common problem that many people have with their safety glasses. These glasses feature lenses that will resist developing fog so that you can wear them in a variety of different conditions.

Many safety glasses only protect you from impacts that come from the front. However, these glasses also protect your face from side impacts that are less common but still possible.

You will be able to purchase a pair of these glasses at a price that is around the average price. This makes them into an excellent value since they are premium glasses.

8. proSPORTsunglasses

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
83
proSPORTsunglasses
Comfort
83
Durability
84
UV Protection
82
Visibility
83
best offer for today
$18.99
Pros:

There is a cleaning case that is made of microfiber.

The earpieces are made of rubber which keeps the glasses on your face.

The lenses block high-intensity blue light which reduces eye strain.

You can purchase them any one of the four different magnification options.

The wrap around your face in order to block debris.

Cons:

The magnifying part of the glasses is small and can be hard to use.

The lens can have a distorted look to them for certain people.

Safety glasses aren't only worn on the job site. Sometimes, they are worn for recreational purposes such as water sports, hiking, and running. Regardless of your reason for wearing safety glasses, these glasses look like regular sunglasses while still providing you with all of the vision and safety features that you have come to expect in a pair of high-quality safety glasses.

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The glasses feature a full wrap around your head. This will help to protect your eyes and face from hazards such as dust, wind, or other kinds of debris that can cause harm.

The earpieces feature a rubber a grip that will keep the glasses from slipping off of your face. This will help them stay put as you wear them and help them stay comfortable.

This is a high-end pair of safety glasses so you will need to plan on spending an amount that is higher than the average price. They are worth the premium because they look like regular sunglasses.

9. SSP Eyewear

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
79.3
SSP Eyewear
Comfort
80
Durability
75
UV Protection
81
Visibility
81
best offer for today
$30.14
Pros:

The lenses have an anti-fog coating on both sides of the lens.

The polycarbonate lenses will not shatter which improves your safety.

Cons:

Some reviewers have reported that the location of the lower lens is too low.

The fit can feel uncomfortable which makes it hard to wear the glasses.

SSP Eyewear makes a pair of safety glasses that have interchangeable lenses. The different lenses allow you to have a high degree of versatility in the glasses so that they can meet a variety of different needs. They are perfect for use at the gun range but they can also be used for work, sports, or other activities that require eye protection.

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You can use different lenses with the frames. This helps to make the glasses versatile and long-lasting. Whenever a lense is no longer usable, you can just replace it with a new one.

Fog on the lenses is a common problem for many safety glasses. These glasses have a coating on the lenses that will help keep fog off the lens so that you can see clearly.

You will need to plan on spending an amount that is much higher than the average price for the SSP Eyewear glasses. This is a premium product made of high-end materials so it costs more.

10. Radians C2-120

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
76.8
Radians C2-120
Comfort
78
Durability
77
UV Protection
76
Visibility
76
best offer for today
$9.56
Pros:

The nose piece is made of a soft rubber material.

The tips also feature rubber so that they grip your head.

The lens is clear so that you see normally in all lights.

The lens is made of a shatterproof poly-carbonate material for durability.

It only weighs 0.32 ounces so it won't feel heavy on your face.

Cons:

The bifocal area is not very large and can be hard to use.

The screws can come loose and need to be re-tightened.

The C2-120 is a pair of high-quality safety glasses that you can use for work or other activities that require eye protection. They are great to use whenever you need to see near and far. The tips and the nose piece are designed to provide you with a comfortable fit all day long which makes them great for wearing for long periods at a time.

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UV Protection

It is important that you protect your eyes from harmful UV radiation since too much exposure can lead to eye problems. The lenses in the C2-120 will block 99.9% of UVA and UVB radiation.

The glasses only weight 0.32 ounces which makes them easy to wear all day long. You will hardly notice that you even have them on thanks to the lightweight and comfortable design.

This item is sold at a price that is lower than the average price. This makes an ideal purchase for when you need a quality pair of safety glasses at a lower price.

Criteria Used for Evaluation

Protection

Most safety glasses conform to the ANSI Z87.1 standard. This is a standard that will help to make sure that the safety glasses will provide you with a sufficient amount of face and eye protection in most situations. The standard includes tests that will make sure you are protected against impacts, liquid splashes, and even non-ionizing radiation. The ANSI Z87.1 standard should be considered a starting point when you are shopping for a pair of safety glasses since you can trust that the glasses will offer you a basic level of protection.

In addition to basic protections, the standard has been updated to include product markings that will tell you what level of protection you will get in particular situations or use cases. For example, when the glasses have "Z87+" stamped on them, that means you are protected against high-velocity impacts in addition to basic impacts. If you are somebody who works in an area that has a lot of dust, then you may want to look for the D5 code on the glasses which tells you that the glasses have been certified to protect you from fine dust. There are other markings as well which include, R (infrared light), U (UV light), W (welding), etc. If you are somebody who needs additional protections, then it is best to become familiar with the markings that are defined in the ANSI Z87.1 standard. Regardless of whatever you are doing, your safety should always be your number one priority which is why it's best to look for glasses that conform to the standard that has been set by ANSI so that you can trust the product when you need it.

Materials

All glasses have lenses and the lenses are made from a variety of different materials. Some examples of the materials used to make lenses in safety glasses are polycarbonate, glass, Trivex, and plastic. Each of the different kinds of lenses offers different advantages and disadvantages so it's helpful to know about the different lens materials so that you can make an informed decision about the glasses prior to purchasing them.

It's unlikely that you will find a pair of safety glasses of any kind that have glass lenses. Glass can get scratched very easily if you are not careful and they are prone to shattering. Plastic is the common material used in inexpensive safety glasses because unlike glass, plastic will not shatter. The downside of plastic is that it too scratches easily so the glasses will not last for long especially in dusty conditions where the glasses can get scratched easily.

Polycarbonate is the most commonly used materials for safety glasses. It weighs less than plastic, blocks UV radiation, and will not shatter. This material is soft and will scratch easily but it is normally coated with a coating that is added after the lenses have been shaped and polished in order to make it scratch resistant. Trivex is the final commonly used material used for safety glasses. It shares many of the same features as polycarbonate but it can also be tinted and will provide better optics than polycarbonate. When you are shopping for a pair of quality safety glasses, you should look for either Trivex or polycarbonate as both of these materials will offer you the best value for your money and tend to be comfortable to wear.

Advanced Features

You may notice that many safety glasses are tinted. Tinting is used to provide you with light filters which may either protect your eyes from certain kinds of harmful light or they may enhance your vision in certain lighting conditions. It's worth known about the different kinds of colors used to make lenses in order to make sure that you pick out the proper tinting (or no tinting) for your needs. This will help you see your best and also protect your eyes from different light hazards.

One option is to get a pair of glasses that are clear and have no tinting at all. This is used in situations where you are working under clear conditions are not exposed to dangerous light. For example, a room that has white fluorescent light is a good option for clear glasses. Some glasses have a "W" code on them followed by a shade number. These are darkly tinted glasses that are used for welding since welding of any kind produces light that is so bright it would damage your eyes if you looked at it without protection. You may also see yellow tinted glasses. Generally speaking, these glasses will filter out high-intensity light such as shades of blue and violet and are useful for when you are under heavy artificial lighting or are looking at computer screens.

There are also glasses that have "R" on them followed by a number. The R is for infrared light and the number is the shade. Infrared light tends to be produced industrial setting such as steel mills and has been found to cause eye damage. If you work in areas that are high in infrared light, then you will want to look for glasses that have infrared filters on the lenses.

Expert Interviews & Opinions

Most Important Criteria (According to our experts opinion)
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#1
Protection
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#2
Advanced Features
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#3
Accuracy
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#4
Comfort
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Still Stylish

Just because they are protective does not mean they do not have to stylish. Keep this in mind, while you're searching for the best bifocal glasses for you. Not only will they keep you safe while working on a project but you will feel chic as well.

Clean them Properly

Cleaning your bifocal safety glasses should be done properly. The proper way to do this is by using a clean link free glasses cleaner gently to remove any dirt and dust if any dirt persists use a gentle spray on glasses cleaner. Using both methods will get the job done in the most gentle manner.

Other Factors to Consider

Accuracy

Like all bifocal glasses, bifocal safety glasses have a magnification scale. The scale is generally in increments of 0.25 diopters so you will see numbers such as +1.50, +1.75, +2.00, etc. The higher the number, the more magnification you will get from the bifocal lenses in the glasses. In order to pick out the proper kind of bifocal safety glasses, you will need to determine the amount of magnification that is required for your eyes.

A common way to to do this is to use a magnification card. This is essentially a card that has letters or text in different sizes with magnification number next to the text. You use the card by reading it without any glasses and find the first line of text that you can read without straining or squinting. Then you follow the chart to see what level of magnification that you require. It is important to keep in mind that you may have different requirements for different eyes so you may need to repeat the test with each eye in order to figure out what you need best.

Once you know what level of magnification you need, then you will just simply need to purchase a pair of glasses that have the proper level magnification. If you have determined your level of magnification properly, then you will end up with a pair of bifocal glasses that will help you see properly. This will help make sure that you get the best value from the purchase. If you are not sure what level of magnification you need, you can always ask an eye doctor to help assist you in determining the amount of magnification that you need.

Comfort

Comfort is also an important factor that you are going to want to consider when you are purchasing a pair of safety glasses. One of the main concerns when it comes to comfort is that you are going to be unlikely to want to wear a pair of glasses that do not feel good. This can cause you to take off or remove the glasses when you actually need to be wearing them and expose you to injury. Of course, there are other reasons why you would want to make sure that your safety glasses are comfortable as well, which is why you should make sure that they fit your face, nose, and your head properly.

The bridge of the nose is one common area where people have trouble when it comes to safety glasses. Sometimes the bridge is too narrow and the glasses sit high up on your nose and can cause pressure and pain. Other times the bridge is too wide and causes the glasses to fall down. One thing that you can look for is a padded and adjustable bridge which will help to prevent issues with the bridge.

The tips of the glasses tend to be the other trouble area where people have problems. You should look for rubberized tips that will grip the side of your head without exerting too much pressure on your temples. This will help the glasses stay in place without making your head feel like it's being pinched. Some brands of safety glasses have tips that are adjustable or replaceable which will help you find the right feel. Comfort is important when it comes to safety glasses so it's worth spending some time to make sure that you have a good pair.

Frequently Asked Questions

q: How do I keep my glasses from fogging up?
a:

A good way to prevent fog on the glasses is to use lenses that have been coated with an anti-fogging coating. This will help to keep water from condensing on the glasses which is what normally results in fog. It can also help to make sure that there is good ventilation for the glasses so that you don't have extreme differences in temperature on each side of the lens which would also cause the lenses to fog up.

q: What kind of hazards can safety glasses protect my eyes from?
a:

Some of the common hazards include heat, dirt, debris, chemicals, light hazards, and impacts. When you are looking for a pair of safety, you should consider the kinds of hazards that you need protection from in order to make sure that you are properly protected when you are using the safety glasses. For example, if you work with chemicals then it would be a good idea to get a pair of glasses that will protect your eyes and face from splashes.

q: Should I get glasses that have UV protection?
a:

Generally speaking, it is a good idea to limit UV exposure. Too much exposure to UV radiation can lead to eye diseases such as cancer or cataracts. Many brands of safety glasses offer UV protection so you should keep an eye out for a pair of glasses that offer you complete protection against UV radiation. It's important that you check to make sure that the lenses block both UVA and UVB radiation in order to make sure that you have complete protection.

q: Are safety glasses necessary for sports?
a:

You should consider wearing safety glasses for sports whenever there is a chance of impact to your face or a lot of dust. For example, many tennis players wear safety glasses because the tennis ball can hit them in the face. If you are going to ride motorcycles, ATVs, or dirt bikes, then you should have safety glasses (or better yet, a helmet). Safety glasses are ideal in any situation where you think there could be hazards for your eyes.

q: Where should the bifocal lens be located in the safety glasses?
a:

Most manufacturers put the lens on the bottom of the glasses. However, you are going to want to check a few things prior to purchasing the glasses. For example, sometimes the bifocal lens is too small or it's positioned too low in the glasses which can make it difficult to use the glasses. Since everyone's face is different, you may need to try a few different pairs of glasses in order to make sure that the bifocal lens is properly positioned.