Subjective Type

When do we consider a person to be myopic or hypermetropic? Explain using diagrams how the defects associated with myopic and hypermetropic eye can be corrected?

Solution

When a person is unable to clearly see distant objects, he is
considered a myopic person. Such a person is suffering from myopia. This happens when image is formed in front of the retina.
When a person is unable to clearly see a nearby object, he is
considered a hypermetropic person. Such a person is suffering from hypermetropia.
This happen when image is formed behind the retina.
Correction of Myopia: A person suffering from myopia needs to
use a concave lens of suitable focal length. The concave lens diverges the rays coming from infinity. After refraction from the concave lens, the rays appear to be coming from the far point of this person's eye. Due to this, a clear image of distant object is made on the retina of that person.
That is how a myopic person is able to clearly see distant objects;
with the help of suitable concave lens.
Correction of Hypermetropia: A hypermetropic person needs to use
a convex lens of suitable focal length. The convex lens converges the light rays coming from a nearby object.
As a result, these light rays appear to be coming from the near
point of this person's eyes.
Due to this, a clear image of nearby object is made on the retina
of that person. That is how a hypermetropic person is able to clearly see nearby objects; with the help of suitable convex lens.

SIMILAR QUESTIONS

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Does short-sightedness (myopia) or long-sightedness (hypermetropia) imply necessarily that the eye has partially lost its ability of accommodation? If not, what might cause these defects of vision?

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A defective eye cannot see close objects clearly because their image is formed:

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Identify the wrong description of the given figures.

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Match the list I with the List II for the combination shown Presbiopia Sphero-cylindrical lens Hypermetropia Convex lens of proper power may be used close to the eye Astigmatism Concave lens of suitable focal length Myopia Bifocal lens of suitable focal length

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A person is suffering from 'presbyopia' ( myopia and hyper metropia both defects ) should use

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A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard. What advice will a doctor give to her? Draw ray diagram for the correction of this defect.

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