Pin point pupil poisoning and Oxalic acid poisoning

Pin point pupil poisoning and Oxalic acid poisoning Introduction: Poisoning causing myosis  (constriction of pupil):  Carbolic  acid  (phenol),  chloralhydrate,  chloroform,barbiturates  (slightly contracted  and  reacting  to  light),  organophosphates, opioids  (morphine),mushroom  poisoning, nitrobenzene  (first  contracted,  later  dilated),  early nicotine poisoning  (later  dilated),  and  pontine hemorrhage. Pin  point  pupil  can  be  caused  by:  Opioids  (morphine). organophosphates, phenothiazines,  clonidine,