Cheap eyeglasses and sunglasses can rob you of the opportunity to see, look your best and fully protect your eyes for a lifetime of good vision. Though you may see acceptably well with cheap eyewear, are you really seeing your best and doing everything you can to protect your eyesight?
Photochromic Lenses: Transitions Lenses And Other Light-Adaptive Lenses
Photochromic lenses are eyeglass lenses that are clear indoors and darken automatically when exposed to sunlight. Other terms sometimes used for photochromic lenses include “light-adaptive lenses” and “variable tint lenses.”
The molecules responsible for causing photochromic lenses to darken are activated by the sun’s ultraviolet radiation. Because UV rays penetrate clouds, photochromic lenses will darken on overcast days as well as sunny days.
Photochromic lenses typically will not darken inside a vehicle because the windshield glass blocks most UV rays. Recent advancements in technology allow some photochromic lenses to activate with both UV and visible light, providing some darkening behind the windshield.
Photochromic lenses are available in nearly all lens materials and designs, including high-index lenses, bifocals and progressive lenses. An added benefit of photochromic lenses is that they shield your eyes from 100 percent of the sun’s harmful UVA and UVB rays.
Because a person’s lifetime exposure to sunlight and UV radiation has been associated with cataracts later in life, it’s a good idea to consider photochromic lenses for children’s eyewear as well as for eyeglasses for adults. Polycarbonate is the safest lens material for kids, providing up to 10 times the impact resistance of other lens materials.
Very important: Always make sure you discuss and make decisions about your eye care based upon a formal appointment with your optician.
For more information and to book and eye examination please contact us:
Specs Direct | Professional Affordable Eyewear
20 McIntyre Street, Parow, Cape Town 7500
Tel: 021 939 1020
Note: We are contracted in to all medical aid