|
The light coming from an object enters the eye through cornea and pupil. The eye lens converges these light rays to form a real, inverted and diminished image on the retina. The light sensitive cells of the retina gets activated with the incidence of light and generate electric signals. These electric signals are sent to the brain by the optic nerves and the brain interprets the electrical signals in such away that we see an image which is erect and of the same size as the object. Before we go into the defects of vision let us be familiar with the terminology used by the ophthalmologists like least distance of distinct vision, far point and power of accommodation of the eye.
| 
