Types of RX Lenses Used in Prescription Eyeglasses and Sunglasses
Polycarbonate lenses are impact-resistant, and an excellent choice for those in sporting activities or careers where eye protection is essential. Polycarbonate lenses offer a high level of sun protection blocking out 100 percent of UV rays.
High-index lenses offer the same exceptional visual experience with a thinner RX lens. As a result of being made from high-index plastics they are strong and near-shatter resistant. They are an excellent choice for rimless eyeglasses.
Transitions lenses adapt to light situations going from light to dark depending on the light conditions. The photo chromic technology allows for the optimal amount of light to reach the eyes whether indoors or outdoors.
Polarized lenses reduce glare and haze allowing the wearer a better visual experience. They contain a special filter that blocks intense reflected light, reducing glare. They are an excellent choice for people who enjoy water or winter sports.
PD - Pupillary Distance (PD) or interpupillary distance (IPD) is the distance (the industry standard is to measure in millimeters) between the centers of the pupils in each eye. This measurement is used when preparing to make prescription eyeglasses. Positioning lenses correctly in relation to the center of the pupils is especially important for higher-powered lenses due to the location of the optical center of the RX lenses.
AR coating - Anti-reflective coating eliminates reflections of light from the front and back surface of lenses. AR coatings can also be applied to the front of prescription eyewear and sunglasses to eliminate the "hot spot" glare that reflects off the lens.
Scratch Resistant Coating is added to the front and back of the lens to minimize the risk of scratches when the lens comes in contact with a hard or rough surface. This type of lens is ideal for children. SV plastic lenses - Single vision lenses have only one use, either to see objects in the distance or for reading glasses. Bifocals or progressives correct both near and farsightedness