Correct Answer - Option 1 : 20 / 70 to 20 / 200
Visual Impairment: The term 'visual impairment' is used to refer to not only those who are blind but also those who have their own vision. When the person has residual vision above a certain level, he is said to have low vision or poor vision. However, if the residual vision is below that level, he is considered to be blind.
Legal Definition: A person is legally blind, if his / her field of vision is 20 degrees, while his / her visual acuity is below than 6 / 60 or 20/200 in the better eye with the best possible corrections with eyeglasses or contact lenses, then he is considered to be blind.
Visual acuity refers to the ability to see clearly from a specified distance. It is measured both far and near distances. Visual acuity is usually tested by the use of the Snellen eye chart.
- The field of vision is the total area in which perception is possible when an individual is looking straight ahead. When gazing straight ahead, a normal eye can see objects within a range of approximately 180 degrees.
Hence, we can conclude that children considered a low vision have a visual acuity between 20 / 70 to 20 / 200.