Perigo Family Eye Care offers an array of eyeglass lenses to meet your individual vision requirements. Our skilled opticians will help you sort through lens types, materials, and treatments, so you can choose the lenses that work best for your situation.
Depending on the lens material you choose and your lifestyle and vision needs, you may want to consider any one of a number of optional lens coatings.
These coatings help to make the eye behind the lens more visible. They also help lessen back reflections of the white of the eye as well as bright objects behind the eyeglasses wearer. Such reduction of back reflections increases the apparent contrast of surroundings.
At night, anti-reflective coatings help to reduce headlight glare from oncoming cars, street lamps and heavily lit or neon signs.
UV coating is used to reduce the transmission of light in the ultraviolet spectrum. UV-B radiation increases the likelihood of cataracts, while long term exposure to UV-A radiation can damage the retina. DNA damage from UV light is cumulative and irreversible. Some
materials, such as Trivex and Polycarbonate naturally block most UV light and do not benefit from the application of a UV coating.
Scratch-resistant coatings are highly recommended, especially for polycarbonate and softer materials, to make lenses last longer. This is done automatically by many labs for polycarbonate and high index lenses.
Eyeglass lenses can be made of a variety of materials. Here are some of the most common along with their respective features:
Plastic lenses are the most economical lenses possible. They offer excellent optical clarity, comparable to that of glass lenses. They can easily be tinted, making them a good choice for sunglasses. Because of their thickness, plastic lenses are not recommended for higher prescription powers.
High index lenses are a choice for the thinnest, most attractive lenses possible. They range from 20% to 65% thinner than plastic lenses (depending on refractive index). The higher the refractive index, the thinner the lens (and the higher the cost).
Most high index plastic lenses provide 100% protection from the sun’s UV rays. Anti-reflective (AR) coating is essential for the best optical performance and appearance.
Instead of having a round (or “spherical”) curve on the front surface, these lenses have a curve that gradually changes from the center to the lens to the periphery. This makes aspheric lenses noticeably flatter for a slimmer, more attractive lens profile.
Trivex lenses are made from a urethane-based material and cast molded similar to how regular plastic lenses are made. This gives Trivex lenses the advantage of crisper optics than injection-molded polycarbonate lenses. They offer tremendous impact resistance and are harder to scratch than polycarbonate lenses. They also block 100% the sun’s harmful UV rays.