Do you know the difference between these two? Cataract occurs when the lens of the eye become cloudy, hindering light from entering the eye as it should. This causes blurred vision, photo sensitivity, and inability to see at night, On the other hand, glaucoma results from a build up of pressure in the eyes causing damage to the optic nerve. If not controlled or treated, it can lead to loss of peripheral (side) vision and permanent blindness. Symptoms of glaucoma may include