distinguish between myopia and hypermetropia. how can these defects be corrected?
Answers
MYOPIA
Myopia is a condition in which the people cannot see objects which are beyond the ‘far point’. Far Point is the point of maximum distance at which the eye lens can form an image on the retina. Myopia is also called as’Near- Sightedness’, in which person cannot see the far objects clearly but can see the near objects clearly. The Myopia can be corrected using Concave lens.
EXAMPLE: A student who is unable to see the letters on the classroom board is suffering with Myopia.
HYPERMETROPIA
Hypermetropia is a condition in which the people cannot see objects placed between the ‘Near point’ and the point of least distance of distinct vision. ‘Near Point’ is the point of minimum distance at which the eye forms clear image on retina. Hypermetropia is also called as ‘Far-Sightedness’ because the individual cannot be able to see the near objects clearly, but can see the far objects clearly. The Hypermetropia is corrected using the Convex lens.
EXAMPLE: An old person, who is not able to read the newspaper is suffering with hypermetropia.
Myopia is the eye defect in which a person can see nearby objects clearly but is not able to see distant objects clearly.It is also known as near-sightedness. In a myopic eye, the image of a distant object is formed in front of the retina and not the retina itself. The defect may arise due to (i) excessive curvature of the eye lens ,(ii) elongation of the eye ball.This defect can be corrected by using a concave lens of suitable power.
Hypermetropia is the eye defect in which a person can see distant objects clearly but is not able to see nearby objects clearly. It is also known as far-sightedness. In a Hypermetropic eye, the image of a nearby object is formed behind the retina. The defect may arises either because (i) the focal length of the eye lens is too long, or(ii) the eyeball has become too small. This defect can be corrected by using a convex lens of appropriate power.
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