Sunglasses

Facts About Using Sunglasses.

1.The best pair of sunglasses should provide protection from ultraviolet rays in

sunlight, intense light, glare and eliminate specific frequencies of light.

2.Ultra violet (UV) light damages the cornea and the retina. Good sunglasses can eliminate UV rays completely and can block light entering the eyes by as much as 97 percent to avoid damage.

3.Certain surfaces, such as water, can reflect a great deal of light, and the bright spots can be distracting or can hide objects. Good sunglasses can completely eliminate this kind of glare using polarization.

4. Certain frequencies of light can blur vision, and others can enhance contrast. Choosing the right color for your sunglasses lets them work better in specific situations.

5.When the eye receives too much light, it naturally constricts the pupil. Once it has constricted the pupil as far as it can, the next step is squinting. If there is still too much light, as there can be when sunlight is reflecting off of snow, water or sand the result is damage to the retina. Good sunglasses provide protection from glare.

6.Damage to the eyes is cumulative, increasing from year to year. Today's children will be exposed to more cumulative UV radiation in their lifetime than any previous generation. 50% of a person's total lifetime UV radiation exposure occurs before age 18. Sunglasses are the basic safety eye wear to negate the long-term hazards of UV radiation.

7.Harmful Effects of UV radiation are :

Cataracts- a cloudiness of the lens that is a major cause of visual impairment and blindness.

Ptergium- tissue growth on the white of the eye that can block vision.

Photokeratitus- temporary sunburn of the cornea.

Macular Degeneration- UV damage to the retina.