The definition of vision impairment by the Centers for Disease Control and Prevention says a visually impaired person’s eyesight cannot be corrected to a “normal level”. It may be said that visual impairment is the functional limitation of the eye or eyes or the vision system. Loss of visual acuity and inability of the person to see objects as clearly as a healthy person. Loss of visual field meaning inability of an individual to see as wide an area as the average person without moving the eyes or turning the head. Photophobia – inability to look at light. Diplopia – double vision. Visual distortion or distortion of images. Visual perceptual difficulties or difficulties of perception.