Abstract: A method (100) of forming an ocular prosthesis (13) comprising: receiving (102a) three dimensional scan data of a patients eye, the three dimensional scan data including volumetric data of at least an iris region, a pupil region and a cornea region of the eye; and forming (110) an ocular prosthesis (13) by an additive manufacturing process, the ocular prosthesis (13) having a body (15) with a volume, wherein the body of the prosthesis includes a three dimensional iris region (23), a three dimensional pupil region (25) and a three dimensional cornea region (26), and the volumetric data determines the size and shape of the iris region (23), the pupil region (25) and the cornea region (26) of the prosthesis (13).