Cataract is the condition, in which the crystalline lens loses its transparency.
The crystalline lens is the lens behind the pupil, which converges the light and allows the eye to focus. In case of hazy crystalline lens, vision becomes blurry and may affect the color vision firstly.

A common symptom of cataract is the difficulty of driving at night and the disturbance of drivers' lights. If the central nucleus of the crystalline lens becomes blurry, the patient may develop diplopia.


 

Secondary Cataract- Posterior Capsule Haze

The capsule is a thin, flexible bag which holds the intraocular lens that is placed in the eye after the cataract surgery. The anterior part of the lens capsule is removed, to facilitate the removal of cataracts. The new intraocular lens is placed into the remaining part of the lens capsule.

This posterior part of the lens capsule becomes hazy and blurred in 20-25% of the patients that undergo cataract surgery. The most common symptoms is blurred vision like in cataracts. That’s why this condition is called secondary cataract.