Multi-channel subjective refractor
A multi-channel subjective refractor can comprise a first display to generate a first image; a second display to generate a second image; a first channel to refract the first image with a first channel refraction; a second channel to refract the second image with a second channel refraction; a beam combiner to receive and to combine the first image and the second image; and a shared channel, to receive the first image and the second image from the beam combiner to refract, in combination with the first channel, the first image with a first refraction; to refract, in combination with the second channel, the second image with a second refraction; and to present the first image with the first refraction and the second image with the second refraction to an eye simultaneously.
1 . A multi-channel subjective refractor, comprising:
a first display to generate a first image;
a second display to generate a second image;
a first channel to refract the first image with a first channel refraction;
a second channel to refract the second image with a second channel refraction;
a beam combiner to receive and to combine the first image and the second image; and
a shared channel,
to receive the first image and the second image from the beam combiner;
to refract, in combination with the first channel, the first image with a first refraction;
to refract, in combination with the second channel, the second image with a second refraction; and
to present the first image with the first refraction and the second image with the second refraction to an eye simultaneously, wherein: the first channel refraction comprises at least one of a first channel defocus and a first channel cylinder; the second channel refraction comprises at least one of a second channel defocus and a second channel cylinder; the first refraction comprises at least one of a first defocus and a first cylinder; and the second refraction comprises at least one of a second defocus and a second cylinder.
2 . The multi-channel subjective refractor of claim 1 , wherein:
the first channel and the second channel share an optical aperture after being combined by the beam combiner.
3 . The multi-channel subjective refractor of claim 1 , wherein:
the shared channel is not configured to refract the first image and the second image;
the first channel is configured to refract the first image with the first defocus and the first cylinder; and
the second channel is configured to refract the second image with the second defocus and the second cylinder.
4 . The multi-channel subjective refractor of claim 3 , wherein:
the first channel comprises
at least one of a first movable lens, a first variable power lens, a first deformable mirror, a first phase modulator, and a first translational stage to move the first display, to refract the first image with the first defocus; and
a first stokes lens, to refract the first image with the first cylinder; and
the second channel comprises
at least one of a second movable lens, a second variable power lens, a second deformable mirror, a second phase modulator, and a second translational stage to move the second display, to refract the second image with the second defocus; and
a second stokes lens, to refract the second image with the second cylinder.
5 . The multi-channel subjective refractor of claim 1 , wherein:
the shared channel is configured to refract the first image and the second image with a shared refraction that includes at least one of a shared defocus and a shared cylinder; and
the shared channel comprises at least one of
a shared movable lens, a shared variable power lens, a shared deformable mirror, or a shared phase modulator, to refract the first image and the second image with the shared defocus; and
a shared stokes lens, to refract the first image and the second image with the shared cylinder.
6 . The multi-channel subjective refractor of claim 5 , wherein:
the first channel comprises at least one of
a first movable lens, a first variable power lens, a first deformable mirror, a first phase modulator, or a first translational stage to move the first display, to refract the first image with the first channel defocus that combines with the shared defocus to create the first defocus; and
a first stokes lens, to refract the first image with the first channel cylinder that combines with the shared cylinder to create the first cylinder; or
the second channel comprises at least one of
a second movable lens, a second variable power lens, a second deformable mirror, a second phase modulator, or a second translational stage to move the second display, to refract the second image with the second channel defocus that combines with the shared defocus to create the second defocus; and
a second stokes lens, to refract the second image with the second channel cylinder that combines with the shared cylinder to create the second cylinder.
7 . The multi-channel subjective refractor of claim 5 , wherein:
at least one of the first channel defocus, the first channel cylinder, the second channel defocus and the second channel cylinder are less than two diopters.
8 . The multi-channel subjective refractor of claim 5 , wherein:
one of the first channel and the second channel is not configured to refract the corresponding first image or second image.
9 . The multi-channel subjective refractor of claim 1 , wherein:
the first channel, the second channel and the shared channel are configured to enable an independent adjustment of the first refraction and the second refraction.
10 . The multi-channel subjective refractor of claim 1 , wherein:
the multi-channel subjective refractor is configured to present the first image with the first refraction and the second image with the second refraction simultaneously in one of an up-down image pair, a side-by-side image pair, and an image pair.
11 . The multi-channel subjective refractor of claim 1 , wherein:
the first image and the second image are the same, and include one or more letters of an eye chart, of a Snellen chart, of an army target, or a figure of an examination chart.
12 . The multi-channel subjective refractor of claim 1 , comprising:
one or more additional channels, configured to present one or more additional images with corresponding refractions simultaneously for the eye.
13 . The multi-channel subjective refractor of claim 1 , comprising:
a multi-channel subjective refractor for each eye, thereby forming a binocular multi-channel subjective refractor.
14 . The multi-channel subjective refractor of claim 13 , wherein:
the binocular multi-channel subjective refractor is implemented as a head-mounted binocular multi-channel subjective refractor.
15 . The multi-channel subjective refractor of claim 1 , comprising:
an automated refraction control system
to receive an input from the patient; and
to change at least one of the first refraction and the second refraction, in response to the patient input.
16 . The multi-channel subjective refractor of claim 15 , comprising:
a user interface to receive the patient input;
a multi-channel subjective refractor controller to generate a refraction change signal in response to the input; and
at least two of a shared actuator, a first channel actuator and a second channel actuator, coupled to the multi-channel subjective refractor controller, to change a corresponding refraction in response to the refraction change signal.
17 . The multi-channel subjective refractor of claim 15 , wherein:
the user interface is one of a graphic user interface, a voice recognition and control interface, a motion sensor, and an at least partially mechanical interface, including one of a slider, a knob, or a switch.
18 . The multi-channel subjective refractor of claim 15 , wherein:
the multi-channel subjective refractor controller includes a processor
to scan a relevant refraction parameter space efficiently by executing a search algorithm; and
to change the corresponding refraction according to the search algorithm.
19 . The multi-channel subjective refractor of claim 1 , wherein:
the first display generates the first image with approximately the same background color as the second display generates the second image.
20 . The multi-channel subjective refractor of claim 1 , wherein:
the first refraction is different from the second refraction.