A person is viewing a straight wire but the wire looks distorted to him. What defect is he suffering from? 

Which glasses or lens are used to correct the short sighted eye defect ?

In a bifocal lens the upper part is for ______________.

Sun appears to set late early because of _____________________.

In old age, people generally have to wear spectacles for reading and writing because ____________________ .

Which of the following are correct :

(a) Far-sightedness is also known as long- sightedness, hypermetropia or hyperopia.

(b) In farsightedness, people cannot see nearby objects clearly, although they can see distant objects clearly.

The middle vascular coat that darkens the eye chamber and prevents refraction by absorbing the light rays is _______________.

Identify which of the following are the functions of eye.

The number of cones in the human eye is _________ the number of rods.

Image formed on retina is/are _______ .