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Major stages in the evolution of the eye in vertebrates. Many scientists have found the evolution of the eye attractive to study because the eye distinctively exemplifies an analogous organ found in many animal forms. Simple light detection is found in bacteria, single-celled organisms, plants and animals.
Enucleation is the removal of the eye that leaves the eye muscles and remaining orbital contents intact. This type of ocular surgery is indicated for a number of ocular tumors, in eyes that have sustained severe trauma, and in eyes that are otherwise blind and painful.
Raccoon eyes, also known as panda eyes or periorbital ecchymosis, is a sign of basal skull fracture or subgaleal hematoma, a craniotomy that ruptured the meninges, or (rarely) certain cancers. [ 1 ] [ 2 ] Bilateral hemorrhage occurs when damage at the time of a facial fracture tears the meninges and causes the venous sinuses to bleed into the ...
Entoptic images have a physical basis in the image cast upon the retina. Hence, they are different from optical illusions, which are caused by the visual system and characterized by a visual percept that (loosely said) appears to differ from reality.
Cherry eye in dogs can be a concerning condition as it can look very angry and uncomfortable. Many animals have three sets of eyelids (so do humans, but ours are much smaller) and the tear gland ...
Because of the wide variety of iris cysts, a categorization was needed. This categorization was proposed by Shields in 1981 and was based on 2 main groups: primary and secondary cyst. Primary cysts origin is neuroepithelial, and rarely causes any issue. Primary cysts can be subcategorized based on their location in the eye.
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