Sunglasses and the real reason we should wear them.

Written by Timothy Gorman

Althoughrepparttar majority ofrepparttar 146151 nations people wear sunglasses for fashion reasons, sunglasses were invented to serve as protection forrepparttar 146152 eyes against UV Rays produced by natural sunlight.

There are three different types of Ultra Violet Radiation. The first isrepparttar 146153 UVC rays. These rays are mostly absorbed byrepparttar 146154 upper atmosphere and show us no reason to be concerned with them. Next arerepparttar 146155 UVA rays. The human eye directly absorbsrepparttar 146156 UVA rays, however, there seems to be little or no evidence that these rays cause any type of eye disorders. The last ofrepparttar 146157 ultra Violet Rays isrepparttar 146158 UVB rays and they arerepparttar 146159 most dangerous rays that cause damage torepparttar 146160 eyes. Studies conducted byrepparttar 146161 Sunglass Association show that people who wear sunglasses on a regular basis, were less likely to have cataracts later on in life. When choosing a pair of sunglasses, make sure that they indicate on them that they protect from ultra violet rays. Sunglasses can provide 100% ofrepparttar 146162 Ultra Violet protection that a person needs. If there is any question aboutrepparttar 146163 level of protection that your sunglasses offer, take them to your optometrist and they can put them on a machine that will tell how much Ultra violet rays can be absorbed from your sunglasses.

Different types of prescription eyeglasses

Written by Timothy Gorman

Prescription eyeglasses are glasses that have been prescribed by an optometrist to be worn by someone who has been diagnosed with a certain eye condition. Depending onrepparttar condition, a different lens will be prescribed.

Prescription eyeglasses are broken down into four different categories.

The Single Vision Lens hasrepparttar 146150 same focal power fromrepparttar 146151 top ofrepparttar 146152 lens torepparttar 146153 bottom ofrepparttar 146154 lens. People who have been diagnosed as farsighted, nearsighted or with having astigmatism can wear single vision lenses to correct these types of eye disorders. Astigmatism is a condition that doesn't allow light to reflect onrepparttar 146155 retina, thus causing distorted images.

A Bifocal Lens is used to correct a condition call Presbyopia. This disorder usually occurs in people in their late 40's. If a person has been diagnosed with Presbyopia, they can't focus in on close objects. That is whererepparttar 146156 Bifocal Lens is helpful. The top ofrepparttar 146157 lens is used for distant vision andrepparttar 146158 bottom ofrepparttar 146159 lens is helpful with close vision. People with Presbyopia need both types of Focal View on their prescription eyeglasses.

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