Eye diseases or disorders are common among people of all ages ranging from children to old. Eye diseases can be defined as an impairment or abnormal functioning of eye which leads to visual disturbance. Most of the eye diseases cause blurred vision whereas a severe case leads to blindness. Major eye problems or diseases are refractive errors, cataracts, glaucoma, retinal disorders, macular degeneration, diabetic eye problems, conjunctivitis etc. Some of the major eye problems will cause permanent loss of vision.