THE EFFECTS OF PHACO-EMULSIFICATION-ASPIRATION AND INTRAOCULAR-LENS IMPLANTATION ON THE PUPIL - PUPILLOGRAPHIC AND PHARMACOLOGICAL STUDY

The authors report postoperative change in pupil diameter and pupil dy namics after phaco-emulsification-aspiration and intra-ocular lens imp lantation by comparing the operated eye and non-operated eye in 20 pat ients who received unilateral surgery. Miosis was noted in the operate d eye throughout the postoperative period in the dark, and also in the light at an early stage after the operation. Both the maximal constri ction velocity and maximal dilatation velocity of the light reflex dec reased postoperatively, but the constriction velocity alone was accele rated 1 or 2 weeks after the operation. In the drug instillation test, pupillary responses to both neosynephrine and pilocarpine were decrea sed, indicating damage both to the dilator and sphincter muscles. Sinc e no hypersensitivity of the pupil was noted, lesions in the axonal fi bres and denervation were judged to be absent. Postoperative miosis is believed to be explained by irreversible damage to the dilator muscle , as well as by the transient effects of inflammatory substances.