change colour and go dark when exposed to UV.
Today, the market has photochromic lenses
( varying tint) which automatically adjust to the level of UV light they are exposed to, going from exceptionally clear indoors to dark outdoors.
Transitions Optical is a leading provider of photochromic lenses
to optical manufacturers worldwide.
It is also advising people to follow these sunglasses tips: * Check sunglasses comply with BSEN 1836: 1997 or carry the CE kite mark and are marked UV 400; * If you already have sunglasses, take them into your local optician to be UV tested; * Invest in photochromic lenses
, which instantly adapt to light changes, darkening in bright light.
Varilux with the "Transitions" coating and the multifunctional coating Crizal provide comfortable vision in any weather.
The new photochromic lenses
were designed to Mil-PRF-31013 (clause 3.
The most convenient and effective way for spectacle wearers to protect their eyes is to wear photochromic lenses
such as Transitions lenses which remain clear indoors and at night, but change tint to cut glare when worn outd ors, boosting comfort and reducing eye fatigue.
As many cars in Dubai have tint, the windscreen will take away around 40 per cent of the UV risk, which makes photochromic lenses
(which darken in sunlight) less effective in the car.
The ferry lookout, who was 60 and slightly short-sighted, was wearing glasses with photochromic lenses
which "effectively reduced his ability to see small lights by at least 20%", the report added.
Managing director Dr Brendan Catlow said the company had been making dyes for photochromic lenses
since the mid-1990s.
Opt for photochromic lenses
that will change according to the amount of light.
(the ones that darken or lighten depending on the ambient light) are good if you run in and out of shady and sunny areas.