<prompt> All of the following may cause cycloplegia except ?AtropineCyclopentolatePhysostigmineTropicamide  <response>: Ans. is c i.e., Physostigmine o Cycloplegia means paralysis of ciliary muscles of eye. o Cholinergic drugs physostigmine cause contraction of ciliary muscle -- cyclospasm not cycloplegia. o Anticholinergic drugs Atropine, cyclopentolate, Tropicamide cause relaxation of ciliary muscles -3 Paralysis of ciliary muscles. 