Contact lens

Abstract

A contact lens comprising first and second orientation indicia to determine an orientation of the contact lens.

1 . A contact lens comprising:
 a contact surface configured to contact an eye of a user;   an outside surface opposite the contact surface;   a first orientation indicia comprising one of an aperture, a protrusion extending parallel to the contact surface, and a cutout along the periphery of the contact lens; and   a second orientation indicia cooperating with the first orientation indicia to indicate an orientation of the contact lens.   
     
     
         2 . A contact lens as in  claim 1 , wherein the second orientation indicia is circumferentially offset from the first orientation indicia. 
     
     
         3 . A contact lens as in  claim 1 , wherein the second orientation indicia extends from the contact surface to the outside surface. 
     
     
         4 . (canceled) 
     
     
         5 . A contact lens as in  claim 1 , wherein the second orientation indicia comprises one of a protrusion and a cutout. 
     
     
         6 . (canceled) 
     
     
         7 . A contact lens as in  claim 1 , wherein one or both of the first orientation indicia and the second orientation indicia are detectable by touch. 
     
     
         8 . A method of making a contact lens, the method comprising:
 providing a first orientation indicia on the contact lens comprising one of an aperture, a protrusion extending parallel to a contact surface of the contact lens, and a cutout along the periphery of the contact lens;   defining a predetermined relationship indicative of an orientation of the contact lens; and   providing a second orientation indicia on the contact lens based on the predetermined relationship.   
     
     
         9 . A method as in  claim 8 , wherein the second orientation indicia is circumferentially offset from the first orientation indicia. 
     
     
         10 . A method as in  claim 8 , wherein the second orientation indicia extends from the contact surface to the outside surface. 
     
     
         11 . A method as in  claim 10 , wherein the second orientation indicia comprises one of an aperture, a protrusion, and a cutout. 
     
     
         12 . A method as in  claim 8 , wherein the second orientation indicia comprises one of a protrusion and a cutout. 
     
     
         13 . (canceled) 
     
     
         14 . A method as in  claim 8 , wherein one or both of the first orientation indicia and the second orientation indicia are detectable by touch. 
     
     
         15 . A method of placing a contact lens, the method comprising:
 obtaining a contact lens having a contact surface, an outside surface opposite the contact surface, a first orientation indicia lens comprising one of an aperture, a protrusion extending parallel to the contact surface, and a cutout along the periphery of the contact lens, and a second orientation indicia;   sensing the second orientation indicia;   sensing the presence or absence of the first orientation indicia at a position indicative of a proper orientation of the contact lens;   if the first orientation indicia is present, placing the contact lens on the eye; and   if the first orientation indicia is absent, reversing the orientation of the contact lens and then placing the contact lens on the eye.   
     
     
         16 . A method as in  claim 15 , wherein the second orientation indicia is circumferentially offset from the first orientation indicia. 
     
     
         17 . A method as in  claim 15 , wherein the second orientation indicia extends from the contact surface to the outside surface. 
     
     
         18 . A method as in  claim 17 , wherein the second orientation indicia comprises one of an aperture, a protrusion, and a cutout. 
     
     
         19 . A method as in  claim 15 , wherein the second orientation indicia comprises one of a protrusion and a cutout. 
     
     
         20 . A method as in  claim 15 , wherein one or both of the first orientation indicia and the second orientation indicia are detectable by touch.