Medical devices, systems, and methods for performing eye exams using displays comprising MEMS scanning mirrors
An instrument for imaging the eye and performing ophthalmic diagnostic tests is disclosed that obtain images of the structures of the eye using imaging technology such as optical coherence tomography (OCT). To assist with such imaging and/or provide additional diagnostics, the ophthalmic diagnostic instrument may additionally include a display for presenting images to the subject whose eyes and vision are being evaluated. This display system may comprise a MEMS (microelectromechanical system) scanning mirror.
1 . An ophthalmic diagnostic instrument comprising:
a display comprising:
a light source configured to output a laser beam;
a MEMS scanning mirror disposed to receive said laser beam, said MEMS scanning mirror comprising a mirror configured to direct light from the light source onto an eye of a user and one or more actuators configured to move the mirror to scan the light from the light source over an area on the eye;
a platform capable of rotational and/or linear movement configured to move in response to eye deviation; and
processing circuitry in communication with the display and the platform,
wherein the MEMS scanning mirror is mounted on the platform, and wherein the processing circuitry is configured to:
control the laser beam in coordination with the scanning of the MEMS scanning mirror to form an image on a retina of the eye; and
control the rotational and/or linear movement of the platform to correct for eye deviation.
2 . The instrument of claim 1 , further comprising an eye tracking system configured to track said eye to identify said eye deviation.
3 . The instrument of claim 2 , further comprising feedback electronics configured to move said platform in response to a signal from said eye tracking system indicative of eye deviation.
4 . The instrument of claim 1 , wherein the width of the mirror is between 1.5 and 2.0 mm.
5 . The instrument of claim 1 , wherein the length of the mirror is between 2.5 and 3.0 mm.
6 . The instrument of claim 1 , wherein the width of the mirror is between 1.5 and 2.0 mm, and wherein the length of the mirror along the major axis is between 2.5 and 3.0 mm.
7 . The instrument of claim 1 , wherein the display further comprises an actuator configured to repeatedly rotate the mirror about an axis through a mechanical range of between +/−12° and +/−20° at a frequency of between 2,000-10,000 Hz.
8 . The instrument of claim 1 , wherein the processing circuitry is further configured to perform diagnostic testing comprising visual acuity testing.
9 . The instrument of claim 1 , wherein the processing circuitry is further configured to perform diagnostic testing comprising visual field testing.
10 . The instrument of claim 1 , further comprising a confocal ophthalmoscope receiving reflected light from the eye.
11 . The instrument of claim 1 , wherein the display further comprises an actuator configured to repeatedly rotate the mirror about an axis at a frequency of between 2,000-10,000 Hz.
12 . The instrument of claim 1 , wherein MEMS scanning mirror is configured to scan said laser beam in a raster scan pattern to form a discernable image on the retina.
13 . The instrument of claim 1 , wherein the processing circuitry is configured to coordinate the modulation of the intensity of the laser beam with the scanning of the MEMS scanning mirror by controlling the modulation of the intensity of the laser beam based on a movement or position of the MEMS scanning mirror.
14 . The instrument of claim 13 , wherein the processing circuitry is configured to coordinate the modulation of the intensity of the laser beam with the scanning of the MEMS scanning mirror by at least:
receiving, from monitoring electronics in communication with the MEMS scanning mirror, one or more signals indicating a position of the MEMS scanning mirror; and
controlling timing of the modulation of the intensity of the laser beam by the light source based at least in part on the received one or more signals.