OnGuard 621 Prescription Safety Glasses

A single vision lens is a type of eyeglass lens that has the same prescription power throughout the entire lens. It’s designed to correct just one type of vision problem, such as nearsightedness (trouble seeing far away) or farsightedness (trouble seeing up close). People who need glasses to see clearly at just one distance—whether for reading or distance.

A digital single vision lens is a more advanced version of a regular single vision lens, made using high-precision “freeform” technology. This process creates the lens with greater accuracy, resulting in clearer and sharper vision, especially at the edges of the lens. What makes digital lenses even better is that they are tailored specifically to your frame’s curve and size. This customization ensures that the lens fits your frame perfectly, giving you a more comfortable and personalized visual experience compared to traditional single vision lenses.

A Flat Top 28 bifocal, also called an FT-28, is a type of bifocal lens that has two different areas of vision correction. The top part of the lens is for seeing things far away, and the lower part is for reading or seeing things up close. The “Flat Top” part means that the reading section is shaped like a small half-circle with a flat top, while “28” refers to the width of the reading section in millimeters. It allows you to switch between near and far vision easily without needing two pairs of glasses.

Flat Top 28 Double Segment Bifocals (Double D bifocals) are the perfect solution for tradespeople and professionals, featuring two convenient reading segments—one at the top and one at the bottom—along with a central distance section, allowing for seamless vision at multiple focal lengths without needing to adjust your head, making them the ultimate choice for those who need efficient, hands-free clarity in both close-up and distant tasks.

Trifocal lenses are prescription lenses with three distinct focal points: one for close-up tasks, one for intermediate distances, and one for distance vision. They offer a seamless transition between all three vision zones, making them ideal for individuals who need clear vision at multiple distances without switching glasses.

A progressive no-line bifocal is a type of lens that helps you see clearly at different distances—near, far, and in-between—without any visible lines on the lens. Unlike traditional bifocals, which have a noticeable line separating the areas for near and far vision, progressive no-line bifocals have a smooth, gradual transition in lens power. This means you can look through different parts of the lens to see clearly at various distances, making it easier to switch between tasks like driving, reading, or using a computer without needing separate glasses.

Polycarbonate (often called “poly”) is a popular material used for eyeglass lenses. It’s lightweight, strong, and impact-resistant, making it great for safety glasses or for people who are active. Polycarbonate lenses have a thinner profile compared to regular plastic lenses because they have a higher index of refraction, which means they can bend light more efficiently. The index of polycarbonate is 1.59, which allows for thinner lenses even with stronger prescriptions.

Polycarbonate (often called “poly”) is a popular material used for eyeglass lenses. It’s lightweight, strong, and impact-resistant, making it great for safety glasses or for people who are active. Polycarbonate lenses have a thinner profile compared to regular plastic lenses because they have a higher index of refraction, which means they can bend light more efficiently. The index of polycarbonate is 1.59, which allows for thinner lenses even with stronger prescriptions.

Trivex is a type of lens material that’s similar to polycarbonate but has some added benefits. Like polycarbonate, Trivex lenses are lightweight, strong, and impact-resistant, making them great for active people or for use in safety glasses. What sets Trivex apart is that it provides even clearer vision because of its higher optical quality. It also has a slightly lower index of refraction (1.53), meaning the lenses may be a little thicker than polycarbonate, but they’re still very light and comfortable to wear.

Lenses made from 1.60 high index plastic are lightweight, durable, and offer a thinner, more attractive appearance compared to standard lenses. With a refractive index of 1.60, they are ideal for stronger prescriptions, reducing thickness and weight while maintaining excellent optical clarity. The advanced design enhances comfort and provides a modern aesthetic, making it a popular choice for those looking for both style and function.

High index 1.67 plastic lenses are a type of eyeglass lens designed for people with stronger prescriptions. These lenses are thinner and lighter than regular lenses because they have a higher index of refraction (1.67), which means they bend light more efficiently. Even if you need a strong prescription, 1.67 high index lenses help reduce the thickness and weight, making your glasses more comfortable and less bulky. They’re a great option for those who want a sleek look without sacrificing vision clarity.

High index 1.74 lenses are the thinnest and lightest plastic lenses available, making them ideal for people with very strong prescriptions. Because they have the highest index of refraction (1.74) for plastic lenses, they can bend light more efficiently, allowing them to be much thinner than regular lenses. This makes your glasses look less bulky and more comfortable to wear, even with a high prescription. High index 1.74 lenses are perfect for anyone looking for a sleek, lightweight option with strong vision correction.

Standard glass lenses are known for their excellent optical quality and scratch resistance. Because glass naturally has a high level of clarity, these lenses offer sharp, clear vision. Glass lenses are also highly resistant to scratches, making them a durable choice that can maintain their quality over time. However, one downside is that glass lenses are heavier than plastic or other modern materials, which can make them less comfortable for all-day wear, especially in stronger prescriptions. Despite their weight, glass lenses remain a great option for those prioritizing durability and top-notch optical clarity.

Lenses made from 1.80 high index glass are designed for individuals with strong prescriptions, providing a thinner and more lightweight option compared to standard glass lenses. With a refractive index of 1.80, these lenses offer exceptional optical clarity while minimizing thickness and weight. Known for their durability and scratch resistance, they provide a sleek, modern look with superior visual performance, making them a great choice for those seeking both style and practicality in their eyewear.

Standard glass lenses are known for their excellent optical quality and scratch resistance. Because glass naturally has a high level of clarity, these lenses offer sharp, clear vision. Glass lenses are also highly resistant to scratches, making them a durable choice that can maintain their quality over time. However, one downside is that glass lenses are heavier than plastic or other modern materials, which can make them less comfortable for all-day wear, especially in stronger prescriptions. Despite their weight, glass lenses remain a great option for those prioritizing durability and top-notch optical clarity.

The Blue Blocker lenses are specially crafted to filter out the blue light given off from the digital screens. Which helps reduce potential damage to your retina from prolonged exposure to computers and smartphone screens. Extremely comfortable, it also helps to reduce eyestrain and eye fatigue. Perfect for all day wear.

The Polarized Gray 3 lenses are a darker shade that won’t distort colors. Polarized lenses eliminate the amount of reflecting light that enters the eye, reducing glare, making images appear sharper and clearer, increasing visual clarity and comfort.

The Light Pink lenses provide crystal clear vision. In addition, these pink tints are a blue light blocker and UV protection. Great for increasing depth of field and vision. Extremely comfortable, it also helps to reduce eyestrain and eye fatigue. Perfect for all day wear.

The Orange lenses are recommended for low-light conditions because they make an environment appear brighter. They enhanced contrast and depth perception

The Yellow lenses provide great clarity, being perfect for outdoor activities when you have to focus your eyes on moving objects in low-light, hazy conditions. Filters out blue light. May cause color distortion.

The American Gray G-15 lenses are a gray-green color, present in most of aviator shape sunglasses. Enhanced contrast, these lenses absorb 85% of visible light and block most of the blue light, ensuring better clarity of vision.

The Dark brown lenses enhance contrast, making these lenses great for activities where distance needs to be judged. Recommended for cloudy days or in low-light conditions. Work as a shield against blue color.

The Dark Gray lenses are great for all-purpose use, they are dark enough to provide overall protection. The gray tint allows you to see the objects in their true color while reducing glare. Recommended for both cloudy and sunny days.

The Light Gray lenses are great for all-purpose use. The gray tint allows you to see the objects in their true color while reducing glare. Recommended for both cloudy and sunny days.

The Polarized Brown 3 lenses enhance colors and contrasts and work as a shield against blue colors, which helps reduce the glare you can get from water’s surface. Polarized lenses eliminate the amount of reflecting light that enters the eye, reducing glare, making images appear sharper and clearer, increasing visual clarity and comfort.

The Transition Grey lenses do not alter colors when exposed to light, so the colors you see will be true. Transition Lenses are an optical lens that darkens on exposures to light and clear when this exposure is away.

The Transition Brown lenses enhance contrast and visual acuity in the sun. Works great against blue color, but may cause color distortion in brown tint. Transition Lenses are an optical lens that darkens on exposures to light and clear when this exposure is away.

The Transition Vantage lenses are the first everyday lenses to both darken and polarize in bright, outdoor light. Perfect for outdoors, these lenses help reduce glare, while assure complete UV protection and help protect your eyes against harmful blue light.

The Transition Xtractive Gray lenses are the darkest Transition lenses available for everyday use. The gray tint will not alter colors when exposed to light. Recommended for outdoors, these lenses also provide automatic ultraviolet.

The Transition Xtractive New Generation Gray lenses are the darkest Transition lenses available for everyday use. The gray tint will not alter colors when exposed to light. Recommended for outdoors, these lenses also provide automatic ultraviolet.

Green IR 3.0 Shaded lens is a type of safety eyewear designed to protect the eyes from intense infrared (IR) radiation and bright visible light. These lenses are made from a specially formulated polycarbonate that absorbs significant amounts of IR and UV radiation. The “3.0” refers to the lens’s shade number, which indicates the level of darkness and the amount of light it can filter. Green IR 3.0 lenses are used where workers are exposed to high heat and light from welding, cutting, or brazing. The green tint helps reduce eye strain by providing good color contrast and visibility while shielding the eyes from harmful rays.

Green IR 3.0 Shaded lens is a type of safety eyewear designed to protect the eyes from intense infrared (IR) radiation and bright visible light. These lenses are made from a specially formulated polycarbonate that absorbs significant amounts of IR and UV radiation. The “3.0” refers to the lens’s shade number, which indicates the level of darkness and the amount of light it can filter. Green IR 3.0 lenses are used where workers are exposed to high heat and light from welding, cutting, or brazing. The green tint helps reduce eye strain by providing good color contrast and visibility while shielding the eyes from harmful rays.

The Halo Night Driving Lenses offer a revolutionary lens design that dramatically improves visibility and comfort in various lighting conditions. Whether you’re navigating through dense fog, driving at night, or in the rain, these lenses work to enhance the clarity of your surroundings. They increase definition in foggy conditions, making it easier to spot objects while boosting the visibility of traffic lights. At night or in rainy weather, the lenses reduce the starburst glare from headlights and raindrops, and they neutralize harsh headlight colors—like blue, bright white, and violet—into a comfortable, warm white, allowing you to focus on the road with ease.

But the benefits don’t stop at driving. The Halo Night Driving Lenses are perfect for everyday use indoors, where they reduce blue light fatigue from computer screens and fluorescent lighting, making them ideal for long reading or work sessions. Outdoors, especially on cloudy days, they provide contrast enhancement with minimal light transmission reduction, helping you maintain sharp vision while enjoying the natural light. These lenses offer an all-in-one solution for anyone seeking clearer, more comfortable vision, no matter the environment.

The Transition Xtractive Brown lenses are the darkest Transition lenses available for everyday use. The brown tint is great against blue colors, enhancing the contrast. Recommended for outdoors, these lenses also provide automatic ultraviolet. May cause color distortion in brown tint.

The Transition Xtractive New Generation Brown lenses are the darkest Transition lenses available for everyday use. The brown tint is great against blue colors, enhancing the contrast. Recommended for outdoors, these lenses also provide automatic ultraviolet. May cause color distortion in brown tint.

Drivewear lenses from Transitions are special sunglasses that adapt to changing light conditions while you’re driving and outdoors. They combine two technologies: polarized lenses to reduce glare from bright sunlight and Transitions technology, which adjusts the tint of the lenses based on the amount of light. In cloudy or rainy conditions, the lenses take on a greenish tint to enhance contrast and improve color perception, making it easier to see. When exposed to bright sunlight, they darken for better protection. Drivewear lenses are designed to help you see more clearly by cutting down on glare, making them perfect for all driving conditions.

A scratch resistant coating is often applied to surfaces that are not inherently scratch-resistant, like CR-39 plastic, polycarbonate, or Trivex. It adds a barrier of protection that hardens the surface against both large gouges and smaller scratches, which can build up and crisscross to add a hazy appearance to lenses. If your lenses are formed from any material other than glass, a scratch-resistant coating will increase their productive lifespan.

UV light is invisible to the human eye but can, in excess, cause retinal burning and scarring. Most sunglasses are already designed to block a high level of UV radiation; other lenses, depending on their function or lens material, may also block some UV rays. If your lenses do not specifically state their UV screening level and you spend time outdoors, an additional UV coating will offer protection and peace of mind. Anti-UV treatment is not necessary on polycarbonate lenses because it is an inherent property of the material.

An anti-fog coating works by chemically affecting the adhesion of water molecules, preventing them grouping into larger clusters that can impair vision. If your glasses are frequently exposed to temperature changes or humid conditions, you’ll likely want an anti-fog coating to help combat condensation. The same goes for anyone who engages in strenuous activities such as physical labor, participation in sports, or exercise. Any activity that causes your body temperature to fluctuate will likely lead to lens fogging.

Anti-reflective (AR) coatings are best suited for indoor use, especially for those frequently exposed to screens or bright lighting, as they reduce glare and enhance visual clarity. Perfect for high index lenses, particularly glass, AR coatings minimize reflections and help alleviate eye strain. They’re ideal for anyone working with computers, driving at night, or spending time around artificial lighting. While AR coatings excel indoors, they are less effective in dusty or dirty environments where frequent cleaning is required. Always clean lenses while wet to maintain their clarity and longevity.

Blue Light Plus AR Coating is a premium protective layer applied using advanced vacuum coating technology. This coating features anti-static and oleophobic layers, ensuring your lenses stay smudge-free and easy to clean. On the front side, the Blue Light protection shields your eyes from harmful high-energy visible (HEV) light in the 440-480nm range, helping reduce digital eye strain. A blue-tinted anti-reflective (AR) coating is applied to the back of the lens to minimize glare, enhancing clarity and comfort. The subtle blue hue adds a sleek, modern touch, making your lenses both functional and stylish.

Silver mirror lenses are one of the most popular colors and lend the wearer a cool, sleek, urban look. This coating on lens exteriors gives them a reflective mirror finish and is available in different colors. It’s an aesthetic choice but also reduces the amount of light passing through the lenses, effectively acting as a tint. Additionally, all our mirrored glasses with come anti-reflective coating on the backside. This coating will not work on transitions, drivewear or clear lenses.

Blue mirror lenses are bright and vibrant, making them an excellent choice for a sunny day at the beach. This coating on lens exteriors gives them a reflective mirror finish and is available in different colors. It’s an aesthetic choice but also reduces the amount of light passing through the lenses, effectively acting as a tint. Additionally, all our mirrored glasses with come anti-reflective coating on the backside. This coating will not work on transitions, drivewear or clear lenses.

Gold mirror lenses offer a luxurious, sophisticated chic with a glittering look that dazzles the eye. This coating on lens exteriors gives them a reflective mirror finish and is available in different colors. It’s an aesthetic choice but also reduces the amount of light passing through the lenses, effectively acting as a tint. Additionally, all our mirrored glasses with come anti-reflective coating on the backside. This coating will not work on transitions, drivewear or clear lenses

Red mirror lenses are warm and sensual, and they’re guaranteed to get the wearer noticed. This coating on lens exteriors gives them a reflective mirror finish and is available in different colors. It’s an aesthetic choice but also reduces the amount of light passing through the lenses, effectively acting as a tint. Additionally, all our mirrored glasses with come anti-reflective coating on the backside. This coating will not work on transitions, drivewear or clear lenses.

Green mirror lenses are serene and calming, perfect for a lazy afternoon floating down the river. This coating on lens exteriors gives them a reflective mirror finish and is available in different colors. It’s an aesthetic choice but also reduces the amount of light passing through the lenses, effectively acting as a tint. Additionally, all our mirrored glasses with come anti-reflective coating on the backside. This coating will not work on transitions, drivewear or clear lenses.

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The Transition Xtractive Polarized lenses combine the benefits of light intelligent lenses and dynamic polarization. The Xtractive Polarized lenses deliver sharper vision, vivid colors, and a larger field of view outdoors.

Transitions XTRActive Polarized lenses are special glasses that automatically darken when you go outside in bright light and become polarized to reduce glare, like from the sun or reflective surfaces. This helps improve your vision by reducing eye strain, especially when driving or outdoors. Inside or in low light, the lenses stay mostly clear. They’re perfect for people who want comfortable vision both indoors and outside, with extra protection from bright sunlight.  They deliver sharper vision, vivid colors, and a larger field of view outdoors.

Photogray extra lenses are glass photochromic lenses developed by Corning, designed to turn Dark Gray on exposure to UV light and return to a clear state indoors. They provide seamless adaptation to changing light conditions, offering comfort and protection against UV rays, ideal for eyewear users seeking convenience and eye health.

Photogray extra lenses are glass photochromic lenses developed by Corning, designed to turn Dark Brown on exposure to UV light and return to a clear state indoors. They provide seamless adaptation to changing light conditions, offering comfort and protection against UV rays, ideal for eyewear users seeking convenience and eye health.

The Basic Plastic or CR-39 plastic lens material, which has a refractive index of 1.49, is an excellent option for those with mild prescriptions and who prefer fully-rimmed eyeglasses. These lenses provide good optical clarity and have the most lens options available.

The Basic Plastic or CR-39 plastic lens material, which has a refractive index of 1.49, is an excellent option for those with mild prescriptions and who prefer fully-rimmed eyeglasses. These lenses provide good optical clarity and have the most lens options available.

Non-prescription lenses provide the same high-quality materials, UV protection, and a variety of lens coatings, including anti-reflective, scratch-resistant, and blue light filtering options. You can also customize them with a range of tints like polarized or mirrored finishes, adding both style and protection. Ideal for those seeking eye comfort or aesthetic enhancement without vision correction.

Standard sunglasses lenses are designed to reduce glare and protect your eyes from harmful UV rays, providing comfortable vision in bright conditions. At RX-Safety, we offer sunglasses in a variety of colors, including Green, Gray, Brown, and American Gray G-15. Each color offers a unique look and level of contrast, allowing you to choose the best option for your outdoor activities.

Transition lenses are light-sensitive lenses that automatically adjust from clear to dark when exposed to sunlight, providing convenient protection from UV rays without needing to switch between regular glasses and sunglasses. At RX-Safety, we offer the full range of Transitions brand lenses, including Signature, XTRActive, XTRActive Polarized, and Drivewear, to suit all your needs.

Specialty lens tints are designed for specific purposes or to enhance style. For example, tints like pink, orange, and yellow can improve contrast or reduce glare, while light grey provides a subtle shade for comfort. Some tints, like yellow, are popular for improving visibility in low-light conditions. At RX-Safety, we offer a variety of specialty tints, including pink, orange, yellow, light grey, and even specialized options like Halo Night Driving lenses, designed to reduce glare and improve vision during night driving.