Human Vision Defects,What is 20/20 Vision?

Visual Defects

What does 20/20 Vision mean?

Visual acuity is denotative as a fraction. The top number refers to the distance you put up from the chart. This is usually 20 feet. The bottom number indicates the distance at which a person with normal eyesight could correctly sympathise the line with the smallest letters. Normal passel is considered 20/20. If your hatful is 20/40, the line you correctly read at 20 feet could be read by a person with normal vision at 40 feet. Of course, just because 20/20 vision is normal doesnt mean its perfect. A small percentage of the existence is blessed with vision better than 20/20, and just late researchers unveiled corrective lens that offered vision closer to 20/10.

Myopia

Causes of Myopia

ill-judgedness or myopia occurs when light entering the eye focuses in front of the retina instead of directly on it. This is caused by a cornea that is steeper, or an eye that is longer than a normal eye. Nearsighted people typically see well up close, moreover have difficulty seeing removed away. Near-sightedness usually becomes increasingly worse through adolescence and stabilizes in early adulthood. Myopia is excessively known to be an inheritable defect.

Effects of Myopia

The effects of myopia thunder mug range depending on the severity of the problem, besides usually the person would find it difficult to see long distances as it would be blurry, and also squinting appears to make things clearer.

Treatment

The treatment for nearsightedness depends on several factors such as the persons age, life style. Vision brook corrected with glasses which bend the light causing the central point to be located of the retina, contacts lenses which work the same as glasses, laser surgery and convention surgery which alter the anatomy of the cornea.

Glaucoma

Causes of Glaucoma

Glaucoma is...

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