Visual impairment is the functional loss of vision. According to the National Dissemination Center for Children with Disabilities, "the terms partially sighted, low vision, legally blind, and totally blind are used in the educational context to describe students with visual impairments. They are defined as follows: Vision can refer to: Visual perception is one of the senses. ...
Partially sighted indicates some type of visual problem has resulted in a need for special education;
Low vision generally refers to a severe visual impairment, not necessarily limited to distance vision. Low vision applies to all individuals with sight who are unable to read the newspaper at a normal viewing distance, even with the aid of eyeglasses or contact lenses. They use a combination of vision and other senses to learn, although they may require adaptations in lighting or the size of print, and, sometimes, braille;
Legally blind indicates that a person has less than 20/200 vision in the better eye or a very limited field of vision (20 degrees at its widest point); and
Totally blind students learn via braille or other non-visual media.
Visual impairment is the consequence of a functional loss of vision, rather than the eye disorder itself. Eye disorders which can lead to visual impairments can include retinal degeneration, albinism, cataracts, glaucoma, muscular problems that result in visual disturbances, corneal disorders, diabetic retinopathy, congenital disorders, and infection." Blind can refer to: The state of blindness, being unable to see A window blind, a covering for a window A hide used to conceal the observer when watching or hunting birds or other animals is sometimes called a hunting blind A blind bet in certain forms of poker A... Human eye cross-sectional view. ... Albinism (from Latin albus, meaning white) is a lack of pigmentation in the eyes, skin and hair. ... Cataract is also used to mean a waterfall or where the flow of a river changes dramatically. ... The cornea is the curved, transparent layer that covers the front part of the eye and protects its inner structures. ... Diabetic retinopathy is retinopathy (damage to the retina) caused by complications of diabetes mellitus, which could eventually lead to blindness. ... A congenital disorder is a medical condition that is present at birth. ... An infection is the detrimental colonization of a host organism by a foreign species. ...
Information on many topics pertaining to parenting and teaching a child with visual impairments
'Visual impairmentmy name' or visionimpairment is vision loss that constitutes a significant limitation of visual capability resulting from disease, trauma, or a congenital or degenerative condition that cannot be corrected by conventional means, including refractive correction, medication, or surgery
According to the U.S. National Dissemination Center for Children with Disabilities, "the terms partially sighted, low vision, legally blind, and totally blind are used in the educational context to describe students with visualimpairments.
Visualimpairment is the consequence of a functional loss of vision, rather than the eye disorder itself.
Thus, "cerebral visualimpairment" is preferred to "cortical blindness." Common causes CVI in infants and young children include hypoxic ischemic encephalopathy (HIE) (in the term born infant), periventricular leukomalacia (PVL) (in the preterm infant), traumatic brain injury due to shaken baby syndrome and accidental head injuries, neonatal hypoglycemia, infections (e.g.
Visual motor disturbances, as in moving the eyes to direct visual attention to an object, fixating on an object of interest, shifting fixation and gaze to a new visual stimulus, and accomplishing fine motor tasks such as copying a drawing, are associated with posterior parietal (-occipital) lobe lesions.
Visual spatial disturbances, as in localization of objects, judgment of direction and distance of objects, and orienting the body in relation to the physical world (the "Where is it?" aspect of vision), are associated with posterior parietal (-occipital) lobe lesions (also "dorsal" pathway).
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