| Amblypoia | A generally correctable vision defect caused by the suppression of images resulting from strabismus or other eye disorders that causes blurred images in either or both eyes. Also referred to as lazy eye.
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| Astigmatism | Difficulties in focusing at any visual range.
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| Cortical visual impairment | Loss of vision resulting from brain damage or other conditions.
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| Hypernopia | Farsightedness; near objects appear out of focus but distant objects are in focus.
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| Legal blindness | Vision of 20/200 or worse in the best eye with the best possible correction.
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| Low vision | Vision of 20/70 to 20/200 in the best eye with the best possible correction.
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| Low vision specialist | An ophthalmologist or optometrist who further specializes in assessment, prescription, and use of low vision devices.
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| Mobility | Moving about an environment safely.
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| Myopia | Nearsightedness; distant objects appear out of focus but near objects are in focus.
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| Nystagmus | Abrupt, jerky movements of the eye.
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| Ophthalmologists | Medical doctors who identify and treat eye problems.
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| Opticians | Individuals who make or deal in optical devices and instruments.
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| Optometrists | Eye doctors who examine eyes for defects and problems in refraction and prescribe correct lenses.
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| Orientation | The process of using sensory input and information to know one's position in an environment.
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| Prebraille skills | The tactile perception and hand movements that will be needed to develop Braille literacy skills.
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| Refraction | The focusing of light as it passes through the components of the eye.
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| Retinopathy of prematurity | Vision loss resulting from high oxygen levels given to sustain life in infancy.
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| Strabismus | Any deviation in the alignment of the eyes as a result of muscle imbalance.
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| Visual acuity | How sharp visual images are perceived.
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| Visual field | The scope of what one can see without turning the head or moving the eyes.
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| Wayfinding | Learning a route through an environment and being able to retrace it from memory.
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