Myopia or Shortsightedness (JDV02A)


let us now study about myopia, which is vision
defect, and, we can also write that, this is also called. shortsightedness. or near
sightedness. and, in this, defect. eye can see. nearby objects. clearly. but, can not
see. for off objects. clearly. that means a first person who is suffering from myopia,
can see a nearby surrounding but, he’ll not be able to see clear objects when the
objects are placed, at large distance from the eye, and, in general we know that normal
eye has its accommodation, between near point and far point where near point is around 25
centimeter and far point is at infinity. but here we can write, in a myopic eye, which
is suffering from myopia. here we can write near point of the eye, is approximately 25
centimeter which is, as good as a normal healthy eye but, its far point, is considered to be,
nearer then infinity. or it is close to the eye compare to, infinity whereas in a normal
healthy eye far point is at infinity. that means, a myopic eye can, see, objects which
are placed between 25 centimeter up to the distance of, the far point. beyond far point
when an object is placed, a myopic eye will not be able to see the object clearly. here
you can see this, realistic situation, which explain, the convergence of light rays in
myopic eye, here you can see this is the eye ball, on which when, on eye lens parallel
light rays are incident, these light rays converge at a point, before retina. so, you
can see, as, the point of convergence of focal point is not at retina in a myopic eye. which
is, between which is lying between eye lens and the retina. so a sharp image will not
be obtain on retina whereas in healthy eye, the, focal point is exactly located, at retina
or retina can be considered to be in the focal plane of the eye lens. now in this situation,
a myopic eye can be, corrected by using, a diverging lens, because the rays are more
converging, before, the retinal point. so here we can see when, in this situation, if
we just have a look on correction. this is the diagram which is explaining us, how, image
formation takes place on retina or myopic eye. and here if we talk about correction.
of myopia. in this situation you can see, again if this is a myopic eye but in front
of it when we place. concave lens or a diverging lens then you can see, when light rays are
incident onto the lens these are slightly diverged. before incident on the lens due
to which the final, convergence point will be on the retina, so in this situation we
can see. eye will be able to see, sharp image, of object which is placed far away from the
eye. so, myopia can be corrected by, using spectacles of diverging lenses. and it varies
from person to person what kind of diverging lens is required or a concave lens is required
for correction of specific myopia.

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