Electronic Device System With Supplemental Lenses

Abstract

A head-mounted device may have a display that displays content for a user. Head-mounted support structures in the device support the device on the head of the user. A non-removable lens system may be supported by the head-mounted support structures. The head-mounted support structures may be configured to receive a removable supplemental lens system. The removable supplemental lens system may be used to customize the head-mounted display to accommodate the user's vision. Information such as information on the optical characteristics of the removable supplemental lens system and the user's eyeglass prescription may be stored in the removable supplemental lens system using bar codes, text, programmable memory, or other data storage. When the removable supplemental lens system is installed in the head-mounted device, control circuitry in the head-mounted device may retrieve the stored information. A gaze tracker system or other sensors may be used in retrieving the stored information.

What is claimed is: 
     
         1 . A system, comprising:
 a head-mounted support structure;   a display coupled to the head-mounted support structure;   control circuitry configured to supply content using the display;   a non-removable lens coupled to the head-mounted support structure that is configured to present the content from the display in an eye box; and   a removable supplemental lens removably coupled to head-mounted support structure between the non-removable lens and the eye box, wherein the removable supplemental lens is configured to store information that is retrieved by the control circuitry.   
     
     
         2 . The system defined in  claim 1  further comprising:
 a gaze tracking system having a light emitter and an infrared image sensor, wherein the removable supplemental lens has a bar code that stores the information, wherein the bar code is opaque at infrared wavelengths and transparent at visible wavelengths, and wherein the image sensor is configured to read the bar code while the removable supplemental lens is removably coupled to the head-mounted support structure. 
 
     
     
         3 . The system defined in  claim 2  wherein the bar code comprises infrared-opaque-and-visible-light-transparent ink on a clear lens element in the removable supplemental lens. 
     
     
         4 . The system defined in  claim 3  wherein the information comprises information selected from the group consisting of: an eyeglass prescription, an eyeglass prescription date of expiration, a username, a manufacturing date, a manufacturer, a serial number, a manufacturing lot number, a model name, a model type, and information on optical characteristics of the removable supplemental lens. 
     
     
         5 . The system defined in  claim 1  further comprising a data reading device coupled to the head-mounted support structure, wherein the control circuitry is configured to use the data reading device to obtain the information from the removable supplemental lens. 
     
     
         6 . The system defined in  claim 5  wherein the information comprises an eyeglasses prescription. 
     
     
         7 . The system defined in  claim 5  wherein the removable supplemental lens includes memory and wherein the data reading device is configured to obtain the information from the memory. 
     
     
         8 . The system defined in  claim 5  wherein the removable supplemental lens comprises text and wherein the data reading device is configured to obtain the information by optically reading the text. 
     
     
         9 . The system defined in  claim 5  wherein the removable supplemental lens includes circuitry configured to store data and wherein the data reading device is configured to obtain the information from the circuitry. 
     
     
         10 . The system defined in  claim 5  wherein the removable supplemental lens includes programmable read only memory, wherein the data reading device is configured to obtain the information from the programmable read only memory, and wherein the information comprises a lens characteristics of the removable supplemental lens. 
     
     
         11 . The system defined in  claim 10  wherein the lens characteristic comprises a lens power associated with the removable supplemental lens. 
     
     
         12 . The system defined in  claim 10  wherein the lens characteristic comprises an aspherical lens power associated with the removable supplemental lens. 
     
     
         13 . The system defined in  claim 10  wherein the lens characteristic comprises an optical aberration associated with the removable supplemental lens. 
     
     
         14 . The system defined in  claim 1  wherein the control circuitry is configured to obtain the information when the removable supplemental lens is coupled to the head-mounted support structure. 
     
     
         15 . The system defined in  claim 14  wherein the information comprises information selected from the group consisting of a username, a serial number, optical characteristics of the removable supplemental lens, and eyeglass prescription information. 
     
     
         16 . A head-mounted device, comprising:
 head-mounted support structures;   a display configured to display content;   left and right positioners;   a non-removable lens system having left and right lenses that are positioned respectively by the left and right positioners;   a removable lens system with removable supplemental left and right lenses that are removably coupled to the head-mounted support structures in alignment respectively with the right and left lenses; and   control circuitry configured to obtain information stored in the removable lens system.   
     
     
         17 . The head-mounted device defined in  claim 16  wherein the information comprises an interpupillary distance for a user and wherein the control circuitry is configured to use the left and right positioners to adjust a lens-center-to-lens-center spacing associated with the left and right lenses to match the interpupillary distance. 
     
     
         18 . The head-mounted device defined in  claim 17  further comprising an optically readable pattern on the removable lens system that stores the information. 
     
     
         19 . The head-mounted device defined in  claim 18  further comprising an image sensor that optically reads the optically readable pattern to retrieve the information from the removable lens system. 
     
     
         20 . The head-mounted device defined in  claim 19  wherein the image sensor comprises an infrared image sensor in a gaze tracking system. 
     
     
         21 . The head-mounted device defined in  claim 16  wherein the information comprises a user's eyeglass prescription and wherein the control circuitry is configured to adjust the left and right positioners based on the user's eyeglass prescription. 
     
     
         22 . An electronic device configured to operate with a removable supplemental lens system, comprising:
 a display that displays content;   control circuitry;   a non-removable lens system configured to allow the display content to be viewed from eye boxes;   a removable supplemental lens system; and   head-mounted support structures that support the display and that support the non-removable lens system between the eye boxes and the display, wherein the removable supplemental lens system is configured to be supported between the non-removable lenses and the eye boxes, wherein the removable supplemental lens system is configured to store information, and wherein the control circuitry is configured to obtain the information from the removable supplemental lens system when the removable supplemental lens system is between the non-removable lenses and the eye boxes.   
     
     
         23 . The electronic device defined in  claim 22  further comprising lens positioners, wherein the control circuitry is configured to use the lens positioners to adjust a lens-to-lens spacing associated with left and right lenses in the non-removable lens system based on the information obtained from the removable supplemental lens system. 
     
     
         24 . The electronic device defined in  claim 22  wherein the information comprises an optical prescription associated with the removable supplemental lens system and wherein the control circuitry is configured to issue an alert to a user in response to determining that there is a mismatch between the user's prescription and the optical prescription associated with the removable supplemental lens system. 
     
     
         25 . The electronic device defined in  claim 22  wherein the information includes distortion information specifying an optical distortion associated with the supplemental lens system and wherein the control circuitry is configured to apply a compensating correction to the content being displayed on the display based on the distortion information.