Comments Visual Impairments Summary Adult learners with visual impairments have varying degrees of life performance challenges in communication and movement. This disability category is comprised of individuals with no vision, low or limited vision, and color blindness. A multitude of information is gained through sight. The use of sight as an efficient means of obtaining information is influenced by one's visual acuity and field of vision.
Visual acuity indicates how well a person can see at various distances.
Field of vision, measured in degrees, is the ability to perceive objects in a wide area. Typically, most individuals have a central field of vision greater than 20 degrees as well as peripheral vision, the ability to perceive objects outside the central line of vision. An individual with no functional use of sight must use other sensory mediums such as touch and hearing in order to learn. Low or Limited Vision. An individual with low or limited vision may use some sight to learn and perform tasks.