Cheap Reading Glasses That Get Dark in the Day
Photochromic lenses: Transitions and other light-adaptive lenses
Photochromic lenses are eyeglass lenses that are clear (or nearly clear) indoors and darken automatically when exposed to sunlight. Other terms sometimes used for photochromic lenses include "low-cal-adaptive lenses," "low-cal intelligent" and "variable tint lenses."
The most popular brand of photochromic eyeglass lenses sold in the Usa is Transitions Lenses. Because of this, some people — including some eye intendance practitioners — refer to photochromic lenses as "transitions lenses" or "transition lenses." But at that place are other brands of photochromic lenses available as well.
Contact lenses tin can likewise now come with photochromic technology. Johnson & Johnson teamed upwardly with Transitions Optical to develop Acuvue Oasys with Transitions, the first light-adaptive contact lens.
HAVING DIFFICULTY ADJUSTING TO BRIGHT Lite? Ask your eye doctor if photochromic lenses (in glasses or contacts) volition assistance.
How photochromic lenses work
The molecules responsible for causing photochromic lenses to darken are activated by the sun's ultraviolet radiation. Considering UV rays penetrate clouds, photochromic lenses will darken on overcast days every bit well as sunny days.
Photochromic lenses typically will non darken inside a vehicle considering the windshield glass blocks near UV rays. Recent advancements in technology permit some photochromic lenses to activate with both UV and visible calorie-free, providing some darkening backside the windshield. Ask your optician for details.
Photochromic eyeglass lenses are available in about 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 percentage of the sunday's harmful UVA and UVB rays.
SEE RELATED: How photochromic lenses work
Benefits of photochromic lenses
Considering a person's lifetime exposure to sunlight and UV radiations has been associated with cataracts later on in life, it's a adept idea to consider photochromic lenses for children's eyewear too as for eyeglasses for adults. Polycarbonate is the safest lens material for kids, providing upwardly to x times the impact resistance of other lens materials.
Adding anti-reflective coating to photochromic lenses enhances their performance even further. AR coating allows more light to pass through photochromic lenses for sharper vision in low-light conditions (such every bit driving at night), and eliminates bothersome reflections of sunlight and other light from the backside of the lenses in vivid conditions.
Though photochromic lenses cost more than clear eyeglass lenses, they offer the convenience of reducing the need to comport a pair of prescription sunglasses with yous everywhere you lot become.
Photochromic lens brands
Pop brands of photochromic lenses sold in the U.s. include:
Transitions Gen 8 (Transitions Optical) — Transitions Gen eight lenses, introduced in the United States in July 2019, are the fastest light-adaptive Transitions lenses available. Gen 8 lenses get darker and go clear once more more speedily — 3 minutes less for fade back than Transitions Signature lenses with Chromea7 technology and 30% less time for the lenses to actuate.
Transitions XTRActive (Transitions Optical) — These lenses were developed for wearers who are light-sensitive indoors and want a darker lens when driving and outdoors. Transitions XTRActive lenses have slight tint indoors to keep your eyes comfortable when exposed to harsh lighting (fluorescent lights, digital devices).
Transitions Vantage (Transitions Optical) — Transitions Vantage lenses have a slight tint indoors and polarize as they darken outdoors for greater glare control in vivid, reflective conditions. This unique applied science offers a high-definition visual feel since the polarization continually adjusts outdoors to match the level of reflective glare.
Sensity (Hoya Vision Care) — Introduced in the U.s. in April 2016, Hoya's Sensity photochromic lenses feature trademarked engineering science that ensures the lenses perform consistently in varying climates and temperatures. Sensity lenses are available in three colors and are offered in a multifariousness of lens designs, lens materials and anti-reflective coatings.
LifeRx (Vision-Ease Lens) — LifeRx lenses are fabricated of polycarbonate and are available in photochromic tints in a variety of lens designs. The lenses take less than a minute to darken outdoors and fade back faster indoors than other photochromic lenses.
PhotoFusion (Carl Zeiss Vision) — Made in Germany, PhotoFusion lenses are available in a neutral gray tint for accurate color vision in all lighting weather, likewise available in brown, "actress" gray, pioneer greenish and bluish. The lenses darken up to 20% faster and lighten indoors up to twice every bit fast as previous Zeiss photochromic lenses.
ColorMatic IQ Sunday 2 (Rodenstock) — Also fabricated in Germany, Rodenstock's ColorMatic IQ Sun two lenses are available in 6 photochromic tints, including brown, grey, orange and dark-green.
SunSensors (Mitsui Chemicals) — Mitsui Chemicals caused SunSensors lenses originally manufactured by Corning. SunSensors are made of mid- and high-index plastic materials and are available in grayness and brown tints in a variety of lens designs.
PhotoGray; PhotoBrown; Sparse & Dark (Corning) — These drinking glass photochromic lenses offer superior scratch resistance but are significantly heavier and less impact resistant than other photochromic lenses. Corning's Thin & Dark lenses feature a gray tint and are up to 30% thinner and lighter than conventional drinking glass photochromic lenses, according to the company.
Corning created the first mass-produced glass photochromic lenses in the 1960s and continues to produce glass photochromic lenses in gray and brown tints.
Photochromic sunglasses
Photochromic sunglasses are primarily for outdoor wear. They are not as clear indoors every bit other photochromic lenses, merely they provide extra condolement in bright sunlight and backside the wheel.
Transitions Drivewear (Transitions Optical) — These polarized adaptive lenses are designed specifically for driving. They adapt to changing light conditions when worn inside a vehicle, enhance contrast, and better visual performance for driving.
Photochromic lenses and blue light
Besides protecting your eyes from glare outdoors, photochromic lenses offer an additional important benefit — they assist protect your optics from harmful blue low-cal.
Blueish low-cal contributes to digital eye strain and causes oxidative stress in the retina. Information technology's even possible that long-term exposure to harmful blueish light from sunlight and the display screens of computers, smartphones and other digital devices may increase a person's risk of macular degeneration and other eye bug later on in life.
See your eye intendance professional to discuss your blue light exposure risks and which blazon and make of photochromic lenses is best for your specific needs.
Page published in February 2019
Page updated in February 2022
Source: https://www.allaboutvision.com/lenses/photochromic.htm
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