Various Eye Defects
Astigmatism
A defect of vision due to non-sphericity of the cornea. The defect is corrected by using cylindrical surfaced lenses.
Colour-blindness
A genetic defect found usually in males. A colour blind mother will always produce colour blind sons. Colour blind people are unable to differentiate between red and green. It can easily be detected through a special chart with various colour dots.
Long sightedness
Also known as Hypermetropia, it is a defect of vision due to which near objects are not seen clearly. The defect can be corrected by using convex lenses of suitable focal length.
Presbyopia
A defect in which accommodative power is gradually lost with increasing age as the lens' converging power decreases.
Short-sightedness
Also known as Myopia, it is a defect in which one cannot see distant objects properly. It is corrected by using concave lenses of suitable focal length. Patients may possibly become normal with progress in age.
Remember
Certain precautions are always helpful in retaining good eyesight:
* Never read books while lying down. Read while sitting.
* Avoid reading late in the night.
* While reading, make sure that the light falls on the book.
* Watch TV from a distance.
* Use computer filters on your PC screens to avoid direct rays.
* Boiled carrots are the best thing for gaining sharp eyesight.
Related
Comments
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i refused to eat carrot but after reading this i ll suerly start eating carrot
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Many pupils in ma class r suffrin frm eye defcts. Cld it b due to lighting prblm, chalk dust or wat?
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but can add more ....
CAUTIONS
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more defects should be added.
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nys...............=)
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where is the cataract?
,.can i ask if what do you call this defect of the eyes if the retina is not in position or lets say the other eye cannot identify the correct lense for its self?
=pls e-mail me @ ore_pevz@yahoo.com
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My nice age 15 yrs suffering from Eye problem that is not to vision long distant object since last 3 years.As per doctor consent her two eyes eyeball incresing & it causes the above problem. so please give me some tips to cure with the help of yoga or pranayam or any type of exercise.
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- AUTHOR
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i cant see properly in both ways far and close what is this defect called
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I realy gained a lot, because I'm the type that like reading while lying down but knowing now that it adds to eye defects i'm now cautious. Thanks.
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The value of eating a certain food to maintain health was recognized long before vitamins were identified. The ancient medical doctor knew that feeding liver to a patient would help cure night blindness, an illness now known to be caused by a vitamin A deficiency.The advancement of ocean voyage during the Renaissance resulted in prolonged periods without access to fresh fruits and vegetables, and made illnesses from vitamin deficiency common among ships
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