The use of cholecystokinin and derivatives of cholecystokinin for inducing miosis in the eye (pupil constriction) after certain types of examinations and operations. Furthermore, the use of antagonists to cholecystokinin and derivatives of these for preventing miosis in the eye, for example during surgery and in cases of uveitis. The invention moreover also comprises ophthalmological compositions containing an active amount of cholecystokinin or of its derivatives or antagonists.
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