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The Purkinje tree is an image of the retinal blood vessels in one's own eye, first described by Purkyně in 1823. It can be seen by shining the beam of a small bright light through the pupil from the periphery of a subject's vision. This results in an image of the light being focused on the periphery of the retina.
One of the first steps in diagnosing diplopia is often to see whether one of two major classifications may be eliminated. That involves blocking one eye to see which symptoms are evident in each eye alone. Persisting blurry or double vision with one eye closed is classified as monocular diplopia. [15]
The ciliary body is a ring-shaped thickening of tissue inside the eye that divides the posterior chamber from the vitreous body. It contains the ciliary muscle, vessels, and fibrous connective tissue. Folds on the inner ciliary epithelium are called ciliary processes, and these secrete aqueous humor into the posterior chamber. The aqueous humor ...
An optical illusion of relative size perception. The two black circles are exactly the same size; however, the one on the left seems larger. Disappearing Model: A trompe-l'œil body painting by Joanne Gair. The dress: An optical illusion resulting from the brain's attempt to discount coloured tinting from daylight and other sources. [1]
A large proportion of those with CBS develop the visual hallucinations as vision begins to deteriorate and stop hallucinating once vision is entirely gone. [10] Complex hallucinations may progress over time if the primary loss of vision is due to damage of the early cortical areas. [ 10 ]
loss of vision; a sensation of a foreign body in the field of vision (floaters) redness, bulging or displacement of the eye (proptosis) a change in the shape of the pupil; pressure within the eye; metamorphopsia (a distortion of vision where, when a person looks at a grid of straight lines, the lines appear wavy and parts of the grid appears ...
As I learned, optic neuritis is a rare medical condition that is most often a symptom of multiple sclerosis or another of the demyelinating diseases that eat away at one’s nerve coatings.
Illusory palinopsia is often worse with high stimulus intensity and contrast ratio in a dark adapted state.Multiple types of illusory palinopsia often co-exist in a patient and occur with other diffuse, persistent illusory symptoms such as halos around objects, dysmetropsia (micropsia, macropsia, pelopsia, or teleopsia), Alice in Wonderland Syndrome, visual snow, and oscillopsia.