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Blindness
Blindness is the condition of lacking visual perception defined as a profound reduction in visual perception. On the 6m visual acuity scale, blindness is defined as less than 3/60. On the 20ft visual acuity scale, blindness is defined as less than 20/400. On the decimal visual acuity scale, blindness is defined as less than 0.05. Blindness is typically characterized by a visual field of no greater than 10 degrees in radius around central fixation. [from HPO]
Retinal degeneration
A nonspecific term denoting degeneration of the retinal pigment epithelium and/or retinal photoreceptor cells. [from HPO]
Hypoxemia
An abnormally low level of blood oxygen. [from HPO]
hypoxia
A decrease in the amount of oxygen in the body. Symptoms range from mild (impaired judgment, memory loss, impaired motor coordination) to severe (seizures and coma). [from NCI]
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