APPARATUS AND METHOD FOR PHOTOLITHOGRAPHICALLY FORMING AN OPHTHALMIC LENS

An apparatus (1) for photolithographically forming an ophthalmic lens (L) comprises:a container (2) comprising a container bottom (20) with an inner surface (200) including a concave portion (201);a piston (4) comprising a distal piston end face (400) with a convex portion (401);wherein the piston (4) is arranged in the container (2) such that the convex portion (401) faces the concave portion (201),and wherein the piston is movably arranged in the container (2);a light source (5, 50) being arranged beneath the container bottom (20) for emitting light towards the container bottom (20);a mask (6) arranged between the light source (5, 50) and the container bottom (20), the mask (6) comprising a plurality of pixels (60) which are configured to be individually controlled to either allow the light emitted from the light source (5, 50) to pass through the individual pixels (60) and to impinge on that part of the container bottom (20) having the concave portion (201) of the inner surface (200), or to not allow the light emitted from the light source (5, 50) to pass through the individual pixels (60) and to prevent the light from impinging the container bottom (20), anda control unit (7) for controlling the individual pixels (60) of the mask (6) to allow for a formation of the ophthalmic lens (L) layer by layer (L1-L4).