LENS CHOICE Polycarbonate and CR-39 (an allyl plastic) are the most widely used lens materials for safety prescription eyewear. CR-39 is lightweight and offers excellent optical clarity as well as durability. Polycarbonate is even lighter than CR-39 and provides significantly more impact resistance. However, polycarbonate is prone to easily scratching. Newer lightweight materials are now also available, including Trivex lenses. Your clinic will determine the best choice of lenses based on the available options approved by your employer, your work hazards and work environment as well as your prescription. The clinic staff are professionals at choosing the right lenses and will work to ensure the PROPER FIT for your eyewear. All Eyesafe™lenses meet CSA compliance standards.
Lens coatings are available to protect you and your eyewear. Your job order will specify the type of coatings that are approved as well as any limits or restrictions. To avoid scratching your lenses, always wet before wiping. Scratch Resistance Coating: Available on all lenses, a scratch resistance coating protects your lenses by creating a stronger bond surface on the lens. While not 100% scratch-proof, the coating will prolong the life of your lenses by preventing minor scratches from wiping or small debris.
Ultra Violet Coating: An Ultraviolet (UV) coating provides protection from UV radiation that can potentially damage the structure of the eye. Some lenses already have a UV coating applied. Ask your clinic professional for details.
Anti-Reflective Coating: A thin coating that eliminates reflections and glare from the surface of
the lens. Anti-reflective coatings also improve light transmission through the lens for night driving and help reduce glare in bright sunlight.
Tints: Tinted lenses are widely used by workers exposed to bright sunshine for long periods of time as well as high intensity lighting tasks such as welding. Tinted lenses are not meant to be worn in low light conditions. If tints are an approved option by your employer, ask your clinic professional if tinted lenses are right for your work environment.
Photochromatics: Photochromatic lenses reduce the hassle of changing eyewear in differing light conditions. The lenses will automatically darken when exposed to specific types of light. Unlike tinted lenses, you cannot control how dark your lenses will get. When used in safety eyewear, it is important to understand that photochromatics take time to clear when the lenses are dark. The time delay will vary based on the darkness of the lens.