Sunglasses protect your eyes from ophthalmic disorders such as cataracts and Macular degeneration. They protect your eyes from UV rays which could lead to cataracts and other ophthalmic diseases.
Sunglasses also protect your eyes against blue light from the solar spectrum which could increase your risk of macular degeneration. UV light can have harmful effects on the eyelids, cornea, lens and retina.
So make sure you think protection when shopping for your frames.