<unk>  is an excessive dilation of the pupil due to disease, trauma or drugs. Normally, the pupil dilates in the dark and constricts in the light. A mydriatic pupil will remain excessively large, even in a bright environment.  Sometimes colloquially referred to as a "blown pupil."
The opposite, constriction of the pupil, is called miosis.
Mydriasis
Blown pupil
Periorbital edema
Eye pain
Blurred vision
Cyclopia
Nystagmus
Necroptosis