KATSIM project develops a vision simulator, which will help patients visualize the post-operative performance of different IOL options (monofocal, trifocal, others) as well as possible side-effects before cataract surgery. KATSIM diagnostic device would be used before cataract surgeries to help match the right patient to right IOL and reduce the anxiety of both patients and doctors. Computer generated holographic (CGH) display technology is the only technology which can create true 3D images with all the required depth and focus cues. The CGH display technology has not been applied to the ophthalmology field yet. CGH display technology enables to shape and steer the beam of light through the relatively clear areas of the cataractous lens. Pprogrammable exit pupil and holographic pupil formation help patients to see crisp images even through cataractous lenses. One can form single or multiple pupils, which help create images in different focal depths using the supermultiview principle initially developed to overcome the vergence and accommodation conflict (VAC) in 3D stereoscopic displays.