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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 drug .
Dilation and constriction of the pupil Pupillary response is a physiological response that varies the size of the pupil , via the optic and oculomotor cranial nerve. A constriction response ( miosis ), [ 1 ] is the narrowing of the pupil, which may be caused by scleral buckles or drugs such as opiates / opioids or anti-hypertension medications.
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]
Horner's syndrome, also known as oculosympathetic paresis, [1] is a combination of symptoms that arises when a group of nerves known as the sympathetic trunk is damaged. The signs and symptoms occur on the same side (ipsilateral) as it is a lesion of the sympathetic trunk.
Whereas, the pupil is the passive opening formed by the active iris. Pupillary reflex is synonymous with pupillary response, which may be pupillary constriction or dilation. Pupillary reflex is conceptually linked to the side (left or right) of the reacting pupil, and not to the side from which light stimulation originates.
pupillary dilation; flushing; In cases where PSH episodes develop post-injury, specifically traumatic brain injury, symptoms typically develop quickly, usually within a week. Symptom onset has been seen to average 5.9 days post-injury. [2] Episodes vary in duration and occurrence.
By the time Leonard and Susan married in 1989, he had already appeared in four Star Trek films, with the fifth — Star Trek V: The Final Frontier — due out later that year.While Susan welcomed ...
When cycloplegic drugs are used as a mydriatic to dilate the pupil, the pupil in the normal eye regains its function when the drugs are metabolized or carried away. Some cycloplegic drugs can cause dilation of the pupil for several days.