What are the causes of short-sightedness?

see full answer

Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

eye-lens is thicker than normal and eye ball is elongated

eye-lens is thinner than normal and eye ball is flattened

A membrane is formed on crystalline eye-lens

All of these

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

The causes of short-sightedness are eye-lens is thicker than normal and eye ball is elongated.
Short-sightedness is also called as myopia. In this defect of vision, a person cannot see objects beyond a certain distance. Far point of a normal person is infinity. But for a myopic person it is shifted from infinity to some finite distance ahead. As a result, image of distant object is formed in front of retina and not on retina as shown in figure1. Therefore, distant objects are not visible. Main causes of myopia are, the eye-lens may be thicker than normal eye and the eye ball may be elongated.
Question Image

Figure1: How image is formed in myopic eye.

Watch 3-min video & get full concept clarity

hear from our champions

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET

🔥 Start Your JEE/NEET Prep at Just ₹1999 / month - Limited Offer! Check Now!

Get Expert Academic Guidance – Connect with a Counselor Today!

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET