A device for enhancing the range of vision of a person with low eye motility which includes a plurality of parallel or concentric prisms with bases disposed paracentrically on a transparent medium. The prisms cooperate to enhance the angle of vision of the person as he moves the eye over a small angle,...http://www.google.fr/patents/US5002383?utm_source=gb-gplus-shareBrevet US5002383 - Polyprismatic lens for enhancing human ocular motility
Polyprismatic lens for enhancing human ocular motility
