Opt for sunglasses that absorb UV, blocking 99 or 100 percent of ultraviolet light. Check for keywords like “absorption” and “blockage” instead of just indicating “protection” on its label. Lenses that are labeled “absorbs UV rays up to 400nm” are equivalent to 100 percent UV absorption.
“Fulfills ANSI ultraviolet requirements” or “special purpose” lenses can block around 99 percent of ultraviolet light. Tinted lenses made of high-index polycarbonate plastic can filter out 100 percent of dangerous UV radiation. Glass and plastic photochromatic lenses that darken automatically in sunlight, then lighten when indoors can provide 100 percent UV absorption. Photochromatic lenses made of plastic have to be changed after using for several years since they tend to lose their self-darkening ability over time.
Any sign of an eye problem should make an appointment with your eye care center Fair Oaks, CA.