AIM--To investigate the effect that squint surgery has on pupillary diameter. METHODS--The effect of squint surgery on pupil size was investigated in 19 patients. RESULTS--A significant mydriasis in the operated eye was observed when compared with the unoperated eye. This was independent of the number or type of extraocular muscles operated upon. CONCLUSION--It is hypothesised that this change in pupillary diameter results from the release of neurotransmitters from tissues damaged during surgery.
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