A gonioscopic viewing system is provided for diagnosis or laser treatment of the anterior chamber angle of a patient's eye. A first lens system (10) includes a concave posterior lens surface (2) with a shape substantially corresponding to the shaped of an average cornea (C) so that, when placed on a patient's eye, light rays originating at the anterior chamber angle and passing through the aqueous humor, pass through the cornea and the posterior lens surface of the first lens system and are directed by the first lens system toward an image forming system. An image forming system is optically aligned with the first lens system for capturing the light rays directed by the first lens system and focusses the light rays to form a real image of the anterior chamber angle outside of the patient's eye.