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In astronomy, seeing is the degradation of the image of an astronomical object due to turbulence in the atmosphere of Earth that may become visible as blurring, twinkling or variable distortion. The origin of this effect is rapidly changing variations of the optical refractive index along the light path from the object to the detector.
The visual system is associated with the eye and functionally divided into the optical system (including cornea and lens) and the neural system (including the retina and visual cortex ). The visual system performs a number of complex tasks based on the image forming functionality of the eye, including the formation of monocular images, the ...
Adaptation (eye) In visual physiology, adaptation is the ability of the retina of the eye to adjust to various levels of light. Natural night vision, or scotopic vision, is the ability to see under low-light conditions. In humans, rod cells are exclusively responsible for night vision as cone cells are only able to function at higher ...
Eigengrau ( German for "intrinsic gray"; pronounced [ˈʔaɪ̯gŋ̍ˌgʁaʊ̯] ⓘ ), also called Eigenlicht ( Dutch and German for "intrinsic light"), dark light, or brain gray, is the uniform dark gray background color that many people report seeing in the absence of light. The term Eigenlicht dates back to the nineteenth century, [1] and has ...
Specialty. Ophthalmology. Illusory palinopsia is a subtype of palinopsia, a visual disturbance defined as the persistence or recurrence of a visual image after the stimulus has been removed. [1] Palinopsia is a broad term describing a heterogeneous group of symptoms, which is divided into hallucinatory palinopsia and illusory palinopsia. [2]
Purple urine bag syndrome ( PUBS) is a medical syndrome where purple discoloration of urine occurs in people with urinary catheters and co-existent urinary tract infection. Bacteria in the urine produce the enzyme indoxyl sulfatase. This converts indoxyl sulfate in the urine into the red and blue colored compounds indirubin and indigo. [1]
Purple culture of Haloarchaea (left) and isolated purple and red membrane components (right) The Purple Earth Hypothesis (PEH) is an astrobiological hypothesis, first proposed by molecular biologist Shiladitya DasSarma in 2007, [1] that the earliest photosynthetic life forms of Early Earth were based on the simpler molecule retinal rather than ...
Three wise monkeys variation : "Hear, see, speak only good" The opposite version of the three wise monkeys can also be found. In this case, one monkey holds its hands to its eyes to focus vision, the second monkey cups its hands around its ears to improve hearing, and the third monkey holds its hands to its mouth like a bullhorn.