Abstract: The retractor device for human or animal tissues, and more particularly for retracting upper and lower eyelids to expose the underlying eyeball for surgery, comprises a pair of retracting arms each having a spoon articulatingly mounted at one first end of said retracting arm to pivot about an axe that is in substantially perpendicular relationship with said retracting arm. A retracting means joins the second ends of the arms in a cooperating relationship and biases the first ends of said retracting arms into retracted positions. Each spoon has a first curvature adapted to the shape of an eyeball and a second curvature adapted to the shape of an eyelid.

Abstract: A retractor of human or animal tissue comprises two arms with a spoon at one end, the other end being connected to a housing. The housing contains a spring which produces a force which spreads the two arms apart. The foot is connected to the housing by means of the spindle and a ball-joint. The lower face of the foot has a double-face adhesive.

Abstract: A corneal lens (1) is provided with a measurement electrode (4), a portion of which being flush with the concave surface of the lens or protruding from said surface, in such a manner to be in service position directly in contact with the cornea of the eye. The convex surface of the lens comprises pins (2) to maintain open the eyelids.This device allows to obtain without any inconvenient for the subject an electroretinogram usable for the ophthalmologist's diagnostic.