System and method for illumination and fixation with ophthalmic diagnostic instruments
First Claim
1. An optical device to diagnose an eye of a patient, the device comprising:
- a display with a visible target visible to a patient;
an optical system to project the visible target along an optical path from the display to the patient, the optical system comprising a lens to provide positive optical power when the visible target is fogged and wherein the display is coupled to the optical system to move the visible target with a movement transverse to the optical path when the visible target is fogged;
a sensor coupled to the optical system to measure optical aberrations of the eye; and
a processor coupled to the display, the optical system and the sensor, the processor having a computer readable memory with instructions embodied thereon to fog the visible target with the optical system, to decrease a size of the visible target on the display when the visible target is fogged, to move the visible target on the display with the movement transverse to the optical path when the target is fogged, and to measure the optical aberration of the eye with the sensor in response to the decreased size and movement of the visible target transverse to the optical path, wherein the processor has instructions to display a stationary scene having a stationary visible image of an object and to move the visible target along the stationary scene transverse to the optical path when the stationary image is displayed.
3 Assignments
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Accused Products
Abstract
An eye measurement system may include a target that moves transverse to an optical path from the target to eye, so as to relax accommodation of the lens of the eye. The target may move transverse to the optical path on a display. The patient may be fogged while the target moves transverse to the optical path, and the target may become smaller such that the patient perceives the target to be moving away from the patient. A pupil camera may measure eye position that can be correlated with the position of the target on the display to determine that the patient has maintained fixation on the moving target. A visible measurement light beam may be pulsed subsequent to and/or during motion of the target that relaxes accommodation of the eye so as to avoid visual interference of the measurement light beam with the target on the display.
67 Citations
23 Claims
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1. An optical device to diagnose an eye of a patient, the device comprising:
- a display with a visible target visible to a patient;
an optical system to project the visible target along an optical path from the display to the patient, the optical system comprising a lens to provide positive optical power when the visible target is fogged and wherein the display is coupled to the optical system to move the visible target with a movement transverse to the optical path when the visible target is fogged;
a sensor coupled to the optical system to measure optical aberrations of the eye; and
a processor coupled to the display, the optical system and the sensor, the processor having a computer readable memory with instructions embodied thereon to fog the visible target with the optical system, to decrease a size of the visible target on the display when the visible target is fogged, to move the visible target on the display with the movement transverse to the optical path when the target is fogged, and to measure the optical aberration of the eye with the sensor in response to the decreased size and movement of the visible target transverse to the optical path, wherein the processor has instructions to display a stationary scene having a stationary visible image of an object and to move the visible target along the stationary scene transverse to the optical path when the stationary image is displayed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 15, 16, 17)
- a display with a visible target visible to a patient;
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10. A method of diagnosing an eye with a sensor, the method comprising:
- presenting a visible target on a display visible to a patient;
projecting the visible target along an optical path from the display to the patient such that the patient sees the visible target;
fogging the visible target with positive optical power such that the visible target appears blurred to the patient;
moving the visible target transverse to the optical path, wherein the display comprises a stationary scene having a stationary visible image of an object and wherein the target moves along the stationary scene transverse to the optical path when the stationary visible image is shown on the display;
decreasing a size of the visible target when the visible target is fogged and moved transverse to the optical path and wherein an accommodation of the eye relaxes when the visible target moves transverse to the optical path; and
measuring optical aberrations the eye with the sensor when the accommodation is relaxed in response to the visible target moving transverse to the optical path. - View Dependent Claims (11, 18, 19, 20, 21, 22, 23)
- presenting a visible target on a display visible to a patient;
Specification