VISUAL IMPAIRMENT
Visual impairment is a condition where someone has a problem with their sense of sight to see while others see partially .it is also known as vision loss. It can also be defined as decreased ability to see to a degree that causes problems not fixable by usual means, such as glasses. Vision loss is becoming a severe problem in the country where most people are losing their sight. Low vision can be rectified through operation or the use of spectacles. According to World Health Organization (WHO) , at least 2.2 billion people globally have a near or distance vision impairment. In at least one billion or almost half of these cases, vision impairment could have been prevented .One billion people include those with moderate or severe distance vision impairment or blindness due to unaddressed refractive error (88.4 million), cataract (94 million), glaucoma (7.7 million), corneal opacities (4.2 million), diabetic retinopathy (3.9 million), and trachoma (2 million), as well as near v...