In cataract, there is a buildup of protein in the lens of the eye which makes it cloudy. This prevents light from passing clearly through the lens, thereby causing loss of vision.

Advancing age is a primary reason for cataract. With age, a protein of the lens turns opaque. Other causes of cataract are metabolic disorders such as diabetes, excessive exposure to sunlight, lifestyle disorders like heavy alcohol consumption and smoking. Injury to the eye can also lead to clouding of the lens of the eye.

A eye motia is a clouding of the lens in the eye which prompts a reduction in vision. Side effects may incorporate blurred colors, hazy or twofold vision, radiances around light, issue with bright lights, and inconvenience seeing during the night.