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Eye Strain / Asthenopia
Eye strain is a term that describes the overuse of the eyes. Typically, the eyes become tired from excessive use of a targeted activity, such as using the computer or monitoring a security system.
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Blind
An individual who is blind has no vision, but may be able to see light and shadows. In other words, the individual has no useful sight. This limitation describes someone who is unable to see because of an injury, disease, or congenital condition. It may be temporary or permanent.
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Vision Loss
An individual with vision loss could have a limited visual field, be unable to distinguish colors, have limitations after nightfall, be photosensitive, have low vision, or have progressive vision loss. Individuals with vision loss experience some degree of difficulty seeing even with the use of corrective lenses. Some individuals with vision loss may have usable vision remaining, while others may be unable to see at all. Vision loss is generally the result of errors of refraction, diseases of the eye, and other vision-related conditions. Accommodations may include the use of accessible materials, magnification, and text-to-speech technologies.
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Vision Impairment
An individual with a vision impairment may be blind or have vision loss. These limitations vary depending on the individual. Vision impairment is a term that encompasses various limitations in eye function. This can include low vision, blindness, limited visual field, photosensitivity, color vision deficiency, or night blindness.