This motor response occurs within minutes of drinking coffee and can last for up to 90 minutes. There is no gender difference in the effect that coffee has on motor activity (Rao et al, 1998), but it may not be related to caffeine.
Dilation of the pupil in an eye with the 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 the inflammation, use topical corticosteroids.
Pupils get larger (dilate) in dim light and smaller (constrict) in bright light. Usually both pupils are about the same size and respond to light equally. Unequal pupil size is called anisocoria. If pupil sizes are very unequal, a person may notice the discrepancy. More often, unequal pupils are noticed only during a doctor's examination. Unequal pupils themselves usually cause no symptoms, but occasionally a person may have trouble focusing on near objects.