Apparatuses and methods for carrying out eye-related measurements

Abstract

An apparatus for carrying out an eye-related measurement on a person includes a device for generating a fixation target with a holographic element. To generate the fixation target, the holographic element is illuminated by a light source. As a result of the illumination, the fixation target arises as a virtual holographic object. The eye-related measurement is conducted on an eye or the eyes of the person fixating the fixation target. Information is conveyed to the person by switching between different fixation targets.

1 - 20 . (canceled) 
     
     
         21 . A method for carrying out an eye-related measurement, comprising:
 providing a holographic element configured to generate a first fixation target and a second fixation target,   carrying out the eye-related measurement while a person directs a gaze at the first fixation target or the second fixation target, and   selectively illuminating the holographic element to generate the first fixation target, the second fixation target, or the first fixation target and the second fixation target,   wherein the first fixation target differs from the second fixation target with regard to at least one of a position, a color, or a shape thereof.   
     
     
         22 . The method according to  claim 21 , further comprising:
 selecting at least one of the first fixation target or the second fixation target to communicate information to the person.   
     
     
         23 . The method according to  claim 22 , wherein the information indicates whether a head of the person is positioned correctly for carrying out the eye-related measurement. 
     
     
         24 . The method according to  claim 23 , further comprising:
 capturing a position of the person's head, and   comparing the captured position of the person's head with a target position.   
     
     
         25 . The method according to  claim 21 , wherein selectively illuminating comprises selectively illuminating with light of a first light wavelength or light of a second light wavelength. 
     
     
         26 . The method according to  claim 21 , wherein selectively illuminating comprises illuminating the holographic element in a first illumination mode or a second illumination mode, and
 wherein the first illumination mode differs from the second illumination mode with regard to at least one of an illumination angle, a wavelength, or an illumination location.   
     
     
         27 . A method for carrying out an eye-related measurement, comprising:
 providing a holographic element configured to generate a first fixation target and a second fixation target,   carrying out the eye-related measurement while a person directs a gaze at the first fixation target or the second fixation target, and   selectively illuminating the holographic element with light of a first light wavelength or light of a second light wavelength, which differs from a first light wavelength,   wherein the holographic element is configured to generate the first fixation target with a color corresponding to the first light wavelength upon illumination with the light of the first light wavelength and the second fixation target with a color corresponding to the second light wavelength upon illumination with the light with the second light wavelength.   
     
     
         28 . The method according to  claim 27 , further comprising:
 communicating information to the person by selectively illuminating the holographic element.   
     
     
         29 . The method according to  claim 28 , further comprising:
 capturing a position of the person's head, and   comparing the captured position of the head with a target position, wherein the information indicates whether the person's head is positioned correctly for carrying out the eye-related measurement.   
     
     
         30 . The method according to  claim 28 , wherein the information comprises at least one of indications, instructions, or feedback to the person, in addition to a mere presence of the first fixation target, the second fixation target, or the first fixation target and the second fixation target. 
     
     
         31 . A method for carrying out an eye-related measurement, comprising:
 providing a holographic element configured to generate a first fixation target and a second fixation target,   carrying out the eye-related measurement while a person directs a gaze at the first fixation target or the second fixation target, and   selectively illuminating the holographic element in a first illumination mode or a second illumination mode,   wherein the first illumination mode differs from the second illumination mode with regard to at least one of an illumination angle, a wavelength, or an illumination location, and   wherein the holographic element is configured to generate the first fixation target with a first shape upon illumination in the first illumination mode, and is configured to generate the second fixation target with a second shape upon illumination in the second illumination mode, the second shape differing from the first shape.   
     
     
         32 . The method according to  claim 31 , further comprising:
 communicating information to the person by selectively illuminating the holographic element in the first illumination mode or the second illumination mode.   
     
     
         33 . The method according to  claim 32 , further comprising:
 capturing a position of the person's head, and   comparing the captured position of the head with a target position, wherein the information indicates whether the person's head is positioned correctly for carrying out the eye-related measurement.   
     
     
         34 . The method according to  claim 32 , wherein the information comprises at least one of indications, instructions, or feedback to the person, in addition to a mere presence of the first fixation target, the second fixation target, or the first fixation target and the second fixation target. 
     
     
         35 . A method for carrying out an eye-related measurement, comprising:
 providing a holographic element configured to generate a first fixation target and a second fixation target,   carrying out the eye-related measurement while a person directs a gaze at the first fixation target or the second fixation target, and
 selectively illuminating the holographic element in a first illumination mode or a second illumination mode, 
 wherein the first illumination mode differs from the second illumination mode with regard to at least one of an illumination angle, a wavelength, or an illumination location, and 
 wherein the holographic element is configured to generate the fixation target upon illumination in the first illumination mode and to generate the second fixation target at a different position from the fixation target upon illumination in the second illumination mode. 
   
     
     
         36 . The method according to  claim 35 , further comprising:
 communicating information to the person by selectively illuminating in the first illumination mode or the second illumination mode.   
     
     
         37 . The method according to  claim 36 , further comprising:
 capturing a position of the person's head, and   comparing the captured position of the person's head with a target position, wherein the information indicates whether the person's head is positioned correctly for carrying out the eye-related measurement.   
     
     
         38 . The method according to  claim 36 , wherein the information comprises at least one of indications, instructions, or feedback to the person, in addition to a mere presence of the first fixation target, the second fixation target, or the first fixation target and the second fixation target.