Unreversed prism gonioscopy lens

A double-reflecting contact lens for viewing the anterior chamber and the anterior chamber angle of an eye, the eye having an optical axis, the lens comprising:

• a lens body having a distal end defining at least a portion of a first surface for contacting an eye and a proximal end defining at least a portion of a second surface;
• a first reflecting surface disposed adjacent the lens body, wherein the first reflecting surface is a planar surface extending from the proximal end terminate at to a middle region in the lens body located between the proximal end and the distal end;
• and
• a second reflecting surface disposed adjacent the lens body, wherein the second reflecting surface is a planar surface extending from the proximal end to the distal end, the second reflecting surface opposing the first reflecting surface at an angle relative to the first reflecting surface;
• a planar shelf adjoining the first reflective surface, the planar shelf extending from an end of the first reflective surface that terminates in the middle region of the lens body to an outer surface of the lens body, wherein at least a portion of the lens body extends between the planar self and the distal end of the lens body, and wherein the outer surface is different from the distal end, proximal end, the first reflecting surface, and the second reflecting surface.