Damage from UV exposure is cumulative, building every time your eyes are exposed to the sun.
Research shows that UVA and UVB rays may contribute to short-term vision impairment as well as to potentially serious age-related eye problems and disease of the eyes, including cataracts. UV light may also contribute to macular degeneration, the leading cause of blindness in people over 60 years old. (http://www.transitions.com/emea/transitions-every-day/eye-wellness/#rays)
In summer we spend much more time outdoors and have a lot more daylight to do so, therefore our eyes become more exposed to the dangers of UV
The good news is that wearing Transitions lenses will help protect your eyes by blocking 100% of invisible UVA and UVB rays.
Transitions (photochromic) lenses react to the UV rays in sunlight and darken accordingly - the brighter the sunlight, the darker the lens becomes. They become completely clear indoors where there is little of no UV light to cause the lens to darken.
At Stepaside Eyecare we have expertise in recommending which UV protecting lenses are best for you and your lifestyle.