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.
This is known as 'constriction for accommodation to near vision'. If the pupils are unequal in size with uniform illumination, or if their reaction to light is unequal, the physician will attempt to explore the cause for this. The variety of reasons for such occurrences are beyond the scope of a Quora answer. Both pupils fully dilated and non reactive to light indicates death.