Differentiate between Near vision and Distant vision (Shape of the eye lens)

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Solution

Near vision (Myopia): Myopic persons are unable to see distant objects clearly.
Distant vision (Hypermetropia): In this case, nearby objects appear blurry while distant objects are seen clearly.
Near vision
Distant vision
The shape of the eye lens becomes too convex or thick or curved. The shape of the eye lens becomes two flat or thin or elongated.

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Q. A person needs a lens of power, −5.5 D for correcting his distant vision. For correcting his near vision, he needs a lens of power, + 1.5 D. What is the focal length of the lens required for correcting:
(a) distant vision?
(b) near vision?
What type of lens is being used for correcting (i) distant vision, and (ii) near vision?

Differentiate between the following pairs on the basis of what is mentioned within brackets:

(b) Near vision and Distant vision (Shape of the lens)

What is the shape of the lens during (1) near vision, (2) distant vision?

Question 5
A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision and (ii) near vision?

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Near vision	Distant vision
The shape of the eye lens becomes too convex or thick or curved.	The shape of the eye lens becomes two flat or thin or elongated.