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Computer Vision Syndrome: Children and Teens
Computer vision syndrome (CVS) is defined as the complex of eye, vision and body problems associated with excessive computer use. Most parents are rightly concerned about the types of people or subject matter that their children and teenagers mi.... Read More

Dry Eye Symptoms: Causes and Treatments
As discussed in the Introduction article, there are three main areas that contribute to dry eye symptoms: Inadequate tear production Tears that evaporate too quickly from the ocular surfaces Imbalance between the three main components of normal .... Read More

Dry Eye Symptoms: Introduction
There are multiple causes behind the symptoms, so finding the specific cause and the best treatment is not as straightforward as it may seem. Also, the term “dry eyes” may actually be one symptom of other conditions, such as.... Read More

Dry Eye Symptoms: Meibomian Gland Dysfunction
Meibomian gland dysfunction (MGD) is the term used for a family of eyelid margin disorders that cause symptoms such as redness, swelling, itching or burning, dryness, crusty lid margins, grittiness, and even the eventual loss of eyelashes. MGD is.... Read More

What's Your Vision "Eye-Q?"
According to a survey done by the American Optometric Association, the first American Eye-Q ™ parents lack important knowledge about eye health and vision care for their children and themselves. Want to see how you do against the original part.... Read More


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Ultraviolet Hazards

Ultraviolet (UV) rays carry more energy than do visible light rays. Thus the eye has a greater risk of damage from absorbing UV radiation than from absorbing other forms of visible light. Two types of UV rays reach the earth s surface: UV-A and UV-B. UV-A rays are the rays emitted from the sun that contribute to premature aging and they are present year-round. They contribute to early wrinkling of the skin the development of cataracts and the progression of age-related macular degeneration. UV-B rays are the rays that cause skin cancers cataracts and photokeratitis or sunburn of the eye. These rays are stronger during the summer months. Most of the damage caused to eyes by UV-A and UV-B rays occurs gradually and is irreversible. Sensitivity to UV rays varies from person to person. Certain prescription and over-the-counter drugs might increase sensitivity. Eyecare professionals physicians and pharmacists can offer advice on the medications that contribute to sensitivity.

Sunglasses that block UV rays will reduce the likelihood of eye damage as they filter out both types of harmful rays. For the best level of protection select sunglasses that block UV-A and UV-B rays between 290 and 400 nanometers (nm) or that block at least 98 per cent of both types of UV rays. It is important to note however that labelling standards for sunglasses are voluntary and not mandatory. The darkness shade or tint of sunglasses does not indicate their ability to block UV rays. Only an invisible UV protective coat applied during the manufacturing stage or built into the lens can accomplish this.

Ironically sunglasses that have not been treated for UV rays may be more detrimental to your eyes than not wearing sunglasses at all. Dark lenses reduce the amount of light entering the eye causing the pupil to dilate. This exposes the inside of your eye to more UV radiation than without the sunglasses. It is extremely important to ensure that your sunglasses have appropriate UV protection especially for children and adults who spend a lot of time outdoors. Quality sunglass manufacturers can apply this protective coat to lenses of different materials designs and tints.