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Enophthalmos is a posterior displacement of the eyeball within the orbit. It is due to either enlargement of the bony orbit and/or reduction of the orbital content, this in relation to each other. [1] It should not be confused with its opposite, exophthalmos, which is the anterior displacement of the eye. It may be a congenital anomaly, or be ...
Liver spot. Liver spots (also known as age spot, solar lentigo, [1] " lentigo senilis ", [1] : 686 " old age spot ", [2] " senile freckle ") [2] are blemishes on the skin associated with aging [3] and exposure to ultraviolet radiation from the sun. [4] They range in color from light brown [5] to red or black and are located in areas most often ...
Amaurosis fugax. The arteries of the choroid and iris. The greater part of the sclera has been removed. Amaurosis fugax ( Greek: ἀμαύρωσις, amaurosis meaning 'darkening', 'dark', or 'obscure', Latin: fugax meaning 'fleeting') is a painless temporary loss of vision in one or both eyes. [3]
Minor dark circles and a hint of periorbital puffiness —a combination principally suggestive of minor sleep deprivation. Periorbital dark circles (including dark circles of the lower eyelid ( DCLE )) are dark blemishes around the eyes. There are many causes of this symptom, including heredity and bruising.
The pupil of the eye dilates in the dark to enhance night vision. Shown here is a pupil of an adult naturally dilated to 9 mm in diameter in mesopic light levels. The average human eye is not able to dilate to this extent without the use of mydriatics. Nocturnal mammals have rods with unique properties that make enhanced night vision possible.
Nyctalopia ( / ˌnɪktəˈloʊpiə /; 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. Night blindness may exist from birth, or ...
The human eye is an organ of the sensory nervous system that reacts to visible light and allows the use of visual information for various purposes including seeing things, keeping balance, and maintaining circadian rhythm . Arizona Eye Model. "A" is accommodation in diopters. The eye can be considered as a living optical device.
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 ...