PUPIL DILATION METHOD USEABLE IN OPHTHALMIC SURGICAL OPERATIONS Russian patent published in 1998 - IPC

FIELD: medicine. SUBSTANCE: method involves introducing ring into the anterior chamber of the eye in the pupil zone. The ring is produced from material having swelling ability and groove running along the outer edge where pupil-adjacent edge of the iris is fixed. Groove size is to correspond to iris thickness on its pupil-adjacent edge. EFFECT: earlier restoration of vision function.