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Mydriasis is the dilation of the pupil, usually having a non-physiological cause, [3] or sometimes a physiological pupillary response. [4] Non-physiological causes of mydriasis include disease, trauma, or the use of certain types of drugs.
Dilation and constriction of the pupil Pupillary response is a physiological response that varies the size of the pupil between 1.5 mm and 8 mm, [ 1 ] via the optic and oculomotor cranial nerve. A constriction response ( miosis ), [ 2 ] is the narrowing of the pupil, which may be caused by scleral buckles or drugs such as opiates / opioids or ...
Adie syndrome presents with three hallmark symptoms, namely at least one abnormally dilated pupil which does not constrict in response to light, loss of deep tendon reflexes, and abnormalities of sweating. [1] Other signs may include hyperopia due to accommodative paresis, photophobia and difficulty reading. [3]
Miosis from bright light pointed directly at the eye. Pupil measured 2.3 mm in diameter ... is the dilation of the pupil. Anisocoria is the condition of one pupil ...
Dilation of the pupil in an eye with synechia can cause the pupil to take an irregular, non-circular shape (dyscoria) as shown in the photograph. If the pupil can be fully dilated during the treatment of iritis, the prognosis for recovery from synechia is good. This is a treatable status. To subdue inflammation, topical corticosteroids can be used.
In ischemic lesions of the oculomotor nerve, pupillary function is usually spared, whereas in compressive lesions, the pupil is involved. Pharmacological agents with anticholinergic or sympathomimetic properties cause anisocoria, particularly if instilled in one eye. Some examples of pharmacological agents which may affect the pupils include ...
This contains a number of nerves that control the eye muscles. 70% of people with pituitary apoplexy experience double vision due to compression of one of the nerves. In half of these cases, the oculomotor nerve (the third cranial nerve), which controls a number of eye muscles, is affected. This leads to diagonal double vision and a dilated pupil.
Sometimes there is flushing on the affected side of the face due to dilation of blood vessels under the skin. The pupil's light reflex is maintained as this is controlled via the parasympathetic nervous system. [citation needed] In children, Horner's syndrome sometimes leads to heterochromia, a difference in eye color between the two eyes. [3]