WHY PEOPLE NEED SUNGLASSESPeople need sunglasses for:
- UV Protection. The sun’s UV radiation can cause cataracts; benign growths on the eye’s surface; cancer of the eyelids and skin around the eyes; and photokeratitis, sometimes called snow blindness, which is a temporary but painful sunburn of the eye’s surface. Wide-brimmed hats and caps can block about 50 percent of UV radiation from the eyes but optometrists say that is not enough protection.
- Blue-Light Protection. Long term exposure to the blue and violet portion of the solar spectrum has been implicated as a risk factor for macular degeneration especially for individuals that are “sun sensitive.”
- Comfortable vision. The sun’s brightness and glare interferes with comfortable vision and the ability to see clearly by causing people to squint and the eyes to water.
- Dark adaptation. Spending just two or three hours in bright sunlight can hamper the eyes’ ability to adapt quickly to nighttime or indoor light levels. This can make driving at night after spending a day in the sun more hazardous.