Different Lens Materials For Glasses

Lighter and thinner than polycarbonate or plastic lenses of exactly the same prescription they are also convenient to wear, frequently making them the lens of preference. Designed to absorb all harmful UV rays, they are often tinted to any shade or color.

This coating escalates the amount of light transmitted through the lens, which improves the caliber of vision. Anti-reflective coating reduces lens reflections and allows more light to enter the eye for better night vision. Whatever the lens material, eyeglass lenses with AR coating transmit over 99% of available light to the eye. Polycarbonate lenses will be the most commonly found in our industry.

Benefits Of Polycarbonate Glasses

And, unlike some other forms of eyeglass lenses, they do not require any additional coating for sun protection. Polycarbonate lenses have a refractive index of just one 1.59, making them 20% to 25% thinner than regular plastic lenses. They are also up to 30% lighter than regular plastic lenses, making them a good choice if you are sensitive to the weight of eyeglasses on the nose. Glass is the most scratch resistant lens material, nonetheless it is actually more brittle than plastic and better to break. This is not a great choice for safety, generally, nonetheless it is good while you are looking for glasses that will never need to be impact resistant but should be very scratch resistant.

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• Neither Synchrony nor any of its affiliates, including CareCredit, make any representations or warranties regarding the products or services described.
• Our replacement lens service enables you to upgrade your preferred frames with a fresh group of premium prescription lenses.
• Lined bifocals typically require the wearer to check through the top portion of the lens for distance and through the lower portion for near vision.
• No eyeglass lens material – not even glass – is scratch-proof.

They are the first to know about the latest lenses, and about current promotions to be sure you get a great deal on your lenses. Progressive lenses—correct more than one vision condition, with the focal power “progressing” from top to bottom with out a visible line separating them.

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For a more precise vision, we use anti-glare coatings like Avance and Sapphire to block unwanted reflections. For glasses, thinner lenses typically have a higher refractive index, while thicker lenses usually have less refractive index. Generally known as the refractive index, this is the relative measure of how a material bends light, which affects the thickness of the lenses for any given frame. The Abbe value of a lens material is really a solution to measure how widely the lens disperses different wavelengths of light as light passes through it.
Our customer support representatives have knowledge of the best options for most applications, along with helpful tips for how to extend the life of your glasses.

Trivex is a more rigid material, making it a better selection for rimless or drill mount frames, and is simply as impact resistant as polycarbonate. Polycarbonate was the initial “thinner, lighter” lens material. Polycarbonate is 10 times more impact resistant than glass and CR-39. Polycarbonate lenses are the preferred choice for safety eyeglasses and children’s eyeglasses. Extended contact with ultraviolet radiation from sunlight can cause damage to your eyes. This can include cataracts and macular degeneration, along with other eye problems. Luckily, polycarbonate lenses already filter harmful UV rays from the sun.
UVA and UVB blocking—can help protect your eyes from the sun’s damaging ultraviolet rays. Xperio UVlenses, Transitions®lenses, and Crizallenses offer protection for the best vision under the sun. Specific gravity is a ratio of a material’s density to the density of water at 4 degrees Celsius. Density and specific gravity can both compare substances in terms to the quantity of mass per unit volume. Density is simply mass per unit volume, however specific gravity is really a ratio and thus does not have any units. A lens with a low specific gravity implies that an identically sized lens of a higher specific gravity will be heavier.

The best lens material for a set of eyeglasses really depends on the individual wearing them and their prescription needs. For a glasses wearer concerned about protection and durability, a thicker polycarbonate lens is the better choice. If clarity is really a priority, then a thinner high-index lens is the best option. Progressive lenses provide clear, continuous vision from distance to near correction with no visible lines like the eye’s natural function.