Experiencing Vision Loss Learn Why! By Steven A Johnson At Isnare.com Ezine Articles

Changes in vision may involve loss of vision or distortion of vision. Most people often describe both types of changes as blurring of vision. People with normal vision have full balances of both cones and rods in their eyes. If a person has many missing or damaged cones, then they will more than likely have reduced visual perception, day and night.

Distortion of vision is a helplessness to see clearly and correctly. This distortion may engage a poor focus due to refractive error, lack of depth perception, double vision, glare or halos, flashes of light, or floaters. It also could involve color blindness.

Refractive error is a failure of the eye to correctly focus an image onto the retina. It causes images to look blurred. Depth Perception is the capability to determine the absolute position of objects in that area. People with impaired depth perception might have difficulty distinguishing which of two objects is closer and there actual position. Double Vision is seeing two images of one object. This usually only occurs only when both eyes are open. This type of double vision is normally due to poor alignment of the eyes, typically caused by weakness in one or more of the nerve muscles that control eye movements.

Once you start to get older people commonly have trouble seeing in low light. This is sometimes referred to as night blindness. Most commonly night blindness outcomes from a cataract, even though night blindness is a trait in certain forms of retinal deterioration, such as retinitis pigmentosa. Several people experience bright flashes of light, flickering lights, or streaks of light, referred to flashing lights. This visual sensation most commonly results from shifting of the jellylike material that fills the back of the eye or less commonly from a detached retina or a migraine headache.

Some people experience something like glare and halos around bright lights, above all when driving at night. Such symptoms are more common in older people and in those who have had certain types of refractive surgery or who have certain types of cataracts. Glare and Halos can also occur in people whose pupils are widely dilated.

Loss of vision is a complete or nearly complete absence of sight. People with loss of vision may see nothing whatsoever, or they may be able to make out light from dark and might even be able to detect blurred shapes. Loss of vision may engage part or all of the visual field of just one or both eyes and may be unexpected or steady, temporary or permanent. People usually notice sudden loss of vision immediately. However, gradual loss might not be noticed and may not be discovered for some time maybe not until a car accident or other event prompts a thorough vision examination.

Complete loss of vision may occur in one or both eyes. Common causes include blockage of the blood supply to the retina, diabetes, disorders that damage the optic nerve, glaucoma, cataracts, macular degeneration, injuries, and, in certain areas of the world, infections.

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