Question

A student needs spectacle of power -0. 5 D for the correction of his vision. 1- name the defect in vision the student suffering from. 2- find the nature and focal length of the corrective lens 3- list two causes of this defect

Answer 1

Answer:

This eye defect is known as Myopia

We need to use concave type of corrective lens here

It is caused due to weak muscles of iris and due to large size of eyeball

Explanation:

1)

Since the power of the lens required for the correction of vision is given as P = -0.5 D so it shows that he is not able to see the objects at distant position

So his defect of vision is known as Myopia

2)

We must require a lens of negative power here for the correction of his vision

So we must have to use concave lens for correction of vision

3)

Myopia occurs

1) when the eyeball is too long, relative to the focusing power of the cornea and lens of the eye

2) Due to weak muscles of Iris.

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Topic : Eye defect

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