Polycarbonate lenses are the best choice for eyeglasses, sunglasses and sports eyewear when the safety of the eye is concerned. Polycarbonate lenses are tough, shatter-resistant, lightweight and ideal for everyday use. They are more impact resistant than plastic. They filter 100% of UV rays during daylight and in fluorescent light. This combination of lightweight comfort, impact resistance and UV protection makes it an easy choice for Children’s eyewear.
The Development: Polycarbonate was initially designed for covering cockpits in fighter planes, because it offered an impact-resistant, clear window. This enabled pilots a full-field of vision and ensured safety. In the 1970s, the popularity of polycarbonate grew as NASA started to use it for astronaut helmet visors and space shuttle windshields. Polycarbonate was introduced to the general public in the 1980s as a safe and affordable alternative to the regular plastic eyeglasses. Today, polycarbonate lenses have set a completely high standard in eyewear safety. These lenses are a desirable choice for sports personalities, people who work in dangerous job environments, and especially for children. Polycarbonate lenses are less likely to fracture and are an ideal choice for people who wear rimless eyeglass frames.
The Manufacturing Process: While most plastic lenses are made from Cast molding process, polycarbonate is a thermoplastic that starts as a solid material in the form of small pellets. In a lens manufacturing process called Injection molding, the pellets are heated until they melt. The liquid polycarbonate is then rapidly injected into lens molds, compressed under high pressure and cooled to form a finished lens product in just about few minutes.
The Types: Polycarbonate single vision lenses are of three different types: Clear Polycarbonate, Transitions and Polarized sunglasses.
Clear Polycarbonate: Also called as Poly, this is a high-index material that is tough, shatter-resistant, lightweight, thin and safe for active wearers, home and on-the-job safety, and everyday wear. Polycarbonate was the first plastic high index lens and still has one of the highest index ratings (1.59). High index advantages are included with every polycarbonate lens so there is never any extra charge for high index when polycarbonate lenses are ordered.
Transitions or Photo chromic: Transition lenses are a great option for people sensitive to sunlight. These are clear at night or when indoors, and darken when exposed to UV rays.
Polarized Sunglasses: Polarized glasses can be worn indoors by people who are sensitive to light, including patients of cataract surgery and those continually exposed to bright light through windows as they reduce glare. The light reflected is horizontally polarized. Polycarbonate lenses have a long way to go and would work wonders when given a scratch resistant coating and stylish frames.