The present invention consists in a pupil dilating device (1) for dilating a pupil and/or maintaining a pupil in a dilated state, said device (1) being generally hook shaped in plan view so as to define an open ended arcuate iris engaging body portion (2) having a distal free end (3) and at or adjacent the other of said ends (5) an integral positioning arm (4) extending outwardly in a generally radial direction therefrom, the positioning arm (4) being sized to extend in use beyond the outer periphery of the iris; said body portion (2) including: an iris engaging formation or formations (6, 7) being adapted to receive and retain the inner peripheral edge of an iris in an expanded state; and, at least one instrument engaging formation (11) at or adjacent said distal free end (3) to enable contraction of the body portion (2) to facilitate engaging location within the iris.
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