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The Amsler grid showing the visual perception of the left eye of a person experiencing metamorphopsia (straight lines appear bent or curved) [1] [2]. Metamorphopsia (from Ancient Greek: μεταμορφοψία, metamorphopsia, 'seeing mutated shapes') is a type of distorted vision in which a grid of straight lines appears wavy or partially blank.
This neurological phenomenon is characterized by a sustained dystonic, conjugate, involuntary upward deviation of both eyes lasting seconds to hours. The term oculogyric is applied in reference to the simultaneous upward movement of both eyes, although the reaction may encompass a variety of additional responses. [ 1 ]
Ophthalmoparesis can result from disorders of various parts of the eye and nervous system: Infection around the eye. Ophthalmoplegia is an important finding in orbital cellulitis. [1] The orbit of the eye, including mechanical restrictions of eye movement, as in Graves' disease.
The brain cell death eventually leads to problems with movement, thinking and behavior. ... expansions in the range of 30 to 100 CAGs were necessary — but not sufficient — to cause Huntington ...
A subconjunctival hemorrhage can often occur without any obvious cause or harm to the eye. A strong enough sneeze or cough can cause a blood vessel in the eye to burst. Hyphema is a result of blunt or penetrating trauma to the orbit that increases intraocular pressure, causing tears in the vessels of the ciliary body and iris.
Retinoschisis is another eye disease that has been shown to cause aniseikonia. [3] There is evidence that a lesion appearing in the posterior area of the ventral occipitotemporal visual pathway can cause macropsia. This lesion can be due to an ischemic cell death after an acute posterior cerebral infarction. [12]
There is debate about how the therapy works and whether it is more effective than other established treatments. [1] [7] The eye movements have been criticized as having no scientific basis. [8] The founder promoted the therapy for the treatment of PTSD, and proponents employed untestable hypotheses to explain negative results in controlled ...
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