Lid retraction is caused by?
Ref:KD Tripathi pharmacology 7th edition (page.no: 154) Apraclonidine causes eyelid retraction due to stimulation of a1 receptor. Brimonidine cause less prominent lid retraction due to weaker a1 activity Ref-Drug facts and comparison 2006/2257
Bimatoprost
Latanoprost
Brimonidine
Apraclonidine
Autonomic nervous system