Scotopic
Scotopic
Scotopic (/skoʊˈtɒpɪk/; from Greek skotos, "darkness", and -opia, "seeing") refers to vision in low light conditions, typically under the illumination of starlight or moonlight. It is one of the three states of visual perception, the other two being photopic (daylight vision) and mesopic (twilight vision).
Etymology
The term "scotopic" comes from the Greek words skotos meaning "darkness" and -opia meaning "seeing". It was first used in the late 19th century to describe the vision under low light conditions.
Physiology
Scotopic vision is primarily mediated by rod cells in the retina, which are highly sensitive to light and allow for vision in dimly lit environments. However, rod cells do not perceive color and have low spatial acuity, resulting in monochromatic and blurry vision under scotopic conditions. This is in contrast to photopic vision, which is mediated by cone cells and allows for color vision and high spatial acuity.
Scotopic Sensitivity Syndrome
Scotopic sensitivity syndrome, also known as Irlen Syndrome, is a condition characterized by difficulty reading in certain lighting conditions, particularly fluorescent light. This condition is thought to be due to a hypersensitivity of the rod cells, leading to an overstimulation of the visual system under certain lighting conditions.
Related Terms
External links
- Medical encyclopedia article on Scotopic
- Wikipedia's article - Scotopic
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