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Anisocoria is a condition characterized by an unequal size of the eyes' pupils. Affecting up to 20% of the population, anisocoria is often entirely harmless, but can be a sign of more serious medical problems.
The main characteristic that distinguishes physiological anisocoria is an increase of pupil size with lower light or reduced illumination, such that the pupils differ in size between the two eyes. At any given eye examination, up to 41% of healthy patients can show an anisocoria of 0.4 mm or more at one time or another.
Mechanical anisocoria refers to anisocoria, a common eye condition in which the two pupils differ in size, that is the result of damage to the iris dilator muscle, which may be caused by trauma, angle-closure glaucoma, surgery such as cataract removal, or uveitis (inflammation of the eye).
Aniseikonia is an ocular condition where there is a significant difference in the perceived size of images. It can occur as an overall difference between the two eyes, or as a difference in a particular meridian. [1]
Miosis from bright light pointed directly at the eye. Pupil measured 2.3 mm in diameter ... Anisocoria is the condition of one pupil being more dilated than the other ...
Born With One Eye And Was At Risk Of Being ‘Disposed Of’ Due To Appearance. ... #40 My Kitten With Anisocoria Has A Diamond Shaped Pupil. Image credits: FreedomNFireflies
Thus, light shone in the affected eye will produce less pupillary constriction than light shone in the unaffected eye. [citation needed] Anisocoria is absent. A Marcus Gunn pupil is seen, among other conditions, in unilateral optic neuritis. [4]
Anisocoria caused by tropicamide instilled into the subject's right eye only. Tropicamide is an antimuscarinic drug that produces short acting mydriasis (dilation of the pupil) and cycloplegia [7] when applied as eye drops. It is used to allow better examination of the lens, vitreous humor, and retina.