Vision Near and far.

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Presentation transcript:

Vision Near and far

IN normal vision the image falls on the retina The light shines through the biconvex lens It converges, in the focal point in the middle of the eye. The focal plane or perfect image falls on the retina upside down.

Myopia or Near sightsighted The eyeball is too long The focal pane or perfect image falls short of the retina Far images look blurry It is corrected with a biconcave lens.

Hypermetropia or Far Sighted The eyeball is too short The focal plane or the perfect image falls behind the retina. Near images look blurry It is corrected with a biconvex lens.

Presbyopia or Far sighted because you are 40 This happens when you get older the lens gets stiffer The ciliary muscles and ligaments get weaker It becomes more difficult to focus you lens to read up close. It is corrected with a bi convex lens.

Astigmatism Blurred vision caused by a misshapen cornea