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Color blindness may also present itself as a symptom of degenerative diseases of the eye, such as cataract and age-related macular degeneration, and as part of the retinal damage caused by diabetes. Vitamin A deficiency may also cause color blindness. [47] Color blindness may be a side effect of prescription drug use.
Nocturia is defined by the International Continence Society (ICS) as "the complaint that the individual has to wake at night one or more times for voiding (i.e., to urinate)". [1] The term is derived from Latin nox – "night", and Greek [τα] ούρα – "urine". Causes are varied and can be difficult to discern. [2]
Nyctalopia (/ ˌ n ɪ k t ə ˈ l oʊ p i ə /; from Ancient Greek νύκτ-(núkt-) 'night' ἀλαός (alaós) 'blind, invisible' and ὄψ (óps) 'eye'), [1] also called night-blindness, is a condition making it difficult or impossible to see in relatively low light. It is a symptom of several eye diseases.
Cerebral achromatopsia is a type of color blindness caused by damage to the cerebral cortex of the brain, rather than abnormalities in the cells of the eye's retina.It is often confused with congenital achromatopsia but the underlying physiological deficits of the disorders are completely distinct.
Achromatopsia, also known as rod monochromacy, is a medical syndrome that exhibits symptoms relating to five conditions, most notably monochromacy.Historically, the name referred to monochromacy in general, but now typically refers only to an autosomal recessive congenital color vision condition.
Poor color separation; Central vision towards the end of progression, because this is a disease of the rods, and the cones are mostly responsible for central vision (macula and fovea) Eventual partial or total blindness. The majority of patients do not become totally blind, often retaining limited or non-functional vision.
Congenital red-green color blindness, the genetic condition that causes the most cases of color blindness. Dichromacy, a type of color vision possessed by most mammals; partial color blindness when in humans. Monochromacy, a lack of color vision; total color blindness when in humans. Achromatopsia, a syndrome that includes total color blindness.
Distribution of rods and cones along a line passing through the fovea and the blind spot of a human eye [1]. A blind spot, scotoma, is an obscuration of the visual field.A particular blind spot known as the physiological blind spot, "blind point", or punctum caecum in medical literature, is the place in the visual field that corresponds to the lack of light-detecting photoreceptor cells on the ...