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High-index glass lenses also have thinner edges, but high-index glass is heavier than conventional glass, so there is not as much weight savings with glass as there is with plastic lenses. Lightweight lenses are even more of a benefit for farsighted prescriptions, which can make conventional lenses very heavy.
Browline glasses are a style of eyeglass frames which were very popular during the 1950s and 1960s, especially in the United States of America. The name derives from the fact that the "bold" [vague] upper part of the frames frame the lenses in the same way [vague] that eyebrows frame the eyes.
More commonly, photochromic lenses transition from clear to tinted when exposed to sunlight, effectively allowing a single pair of eyewear to function as both your sunglasses and eyeglasses! Not only do these types of lenses help to reduce glare from the sun, they also provide 100 % UV-protection for your eyes regardless of tint whether their tinted or not. Other common names for photochromic lenses include Transitions (a popular brand name), variable tint, and light adaptive lenses.
Frames made from polycarbonate are primarily associated with sport or safety glasses, as well as glasses for children. Pros: In combination with polycarbonate lenses, this material offers optimum impact resistance and eye protection. It is suitable for sportswear. Cons: Polycarbonate eyeglass frames can not be adjusted very well.
Thanks to modern production methods, extraordinarily lightweight materials and special frame and lens designs, today's manufacturers can produce extremely lightweight glasses. BETTER VISION explains the key tips for getting ultra-thin and ultra-lightweight lenses and frames.
Lightweight, impact-resistant polycarbonate and Trivex lenses are the best choice for safety glasses, sports eyeglasses and children's eyewear. Since then, polycarbonate lenses have become the standard for safety glasses, sports goggles and children's eyewear.
Unique eyewear is characterized by frames with unusual, even funky shapes or accentuated features that make a statement. Themes typically found in unique-style eyeglasses or sunglasses include bold, bright colors and patterns as well as over-the-top embellishments.