As we get older, our eyes undergo physiological changes that can cause vision problems and eye diseases such as age-related macular degeneration and glaucoma.
Ultraviolet light from the sun carries two types of radiation, UVA, and UVB rays (which also cause photoaging and wrinkling of our skin). Since UV light carries more energy than visible light, it can do greater damage to our eyes. As we age, the damage simply has more time to accumulate: a cataract, (cloudiness of the lens) for example, is believed to be caused by many years of exposure to bright sunlight.
Does Lens Darkness Matter?
While very dark lenses might offer greater protection, but it isn't, in fact, the darkness of the lens only affects visible light, not UV light.
Darker lens color or tint are not the factor that protect your eyes. It's the UV blocking glasses you should look for. According to research, dark lenses actually cause the pupil of your eye to getg larger to let in more light, that means UV light will get in more too.
Tips on Choosing Sunglasses to Prevent Cataracts and Other Eye Issues
The best sunglasses should be offering:
100% UV protection
Long-term exposure to UV radiation in sunlight is linked to cataracts and eye growths, including cancer. UVB radiation is considered more dangerous to the eyes and skin than UVA radiation.
Look for sunglasses that block 99 percent or 100 percent of all UV light. Some manufacturer's labels say "UV absorption up to 400nm." This is the same thing as 100 percent UV absorption.
High optical quality
It means glasses that are free from manufacturing defect such as bubbles or waves that could affect vision to your eye. And try look for impact resistant lenses, as these lenses are more capable of taking impact without leaving any marks.
Larger frame that offers more coverage of eye area
Larger frame offers wider and more coverage of what you see, and it is also offer more protection of UV radiation.
As optional, it is recommended to pick whichever comfortable, as you may wear it throughout the whole time.
Wear Sunglasses After Cataract Surgery
During cataract surgery, a new intraocular lens (IOL) is inserted to replace the old cloudy lens.
Most intraocular lenses now absorb UV light. If you had your cataract surgery some time ago, your lens may not absorb UV light, and you should wear sunglasses that offer that protection. The AOO recommends even people with UV-absorbing lenses after cataract surgery wear protective sunglasses.
Other Ways to Protect Your Eyes From the Sun
Sunglasses offer just one form of protection for aging eyes. Health Canada and other agencies advise also wearing a visor or wide-brimmed hat when you're outdoors and avoiding times of brightest and most intense sunlight, such as summer days between the hours of 11 am and 4 pm (when the UV index is highest).