The pupil is also called as a window of the eye which changes its shape depending upon the intensity of light normally. It has to be central round reacting to light both direct and indirect.

It is through this pupil we can see inside of eyes like optic nerve and retina. There are various ocular conditions and drugs which can alter the shape of pupil various conditions are  Cong we can have more than one pupil called as polycoria  In axendfels iris anomaly, we can have more than one pupil    In Cong coloboma of iris pupil is down and In trauma & in blunt trauma we can get traumatic miosis mydriasis or polycoria    Drugs like miotics and mydriatics can make pupils small and dilated respectively    Post-surgical one may get updrawn or boat-shaped pupil    Pinpoint pupils in pontine haemorrhage  Opium addicts and Cannabis indica    Irregular pupil due to post synekia in iritis    ARP   …