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:
at least one laser diode configured to output a light beam;
a single mode optical fiber disposed to receive said light beam and direct said light beam; and
a MEMS scanning mirror disposed to received said light beam from said single mode fiber, said MEMS scanning mirror configured to scan across an eye in synchronization with modulation of the light beam to form an image in the eye,
wherein the ophthalmic diagnostic instrument is configured to perform an ophthalmic measurement.
2 . The instrument of claim 1 , wherein said at least one laser diode comprises a plurality of laser diodes.
3 . The instrument of claim 1 , wherein said MEMS scanning mirror is configured to raster scan across an eye in synchronization with modulation of the light beam to form an image in the eye.
4 . The instrument of claim 1 , further comprising processing circuitry configured to perform diagnostic testing.
5 . The instrument of claim 4 , wherein the diagnostic testing comprises visual acuity testing.
6 . The instrument of claim 4 , wherein the diagnostic testing comprises visual field testing.
7 . The instrument of claim 1 , further comprising a confocal ophthalmoscope receiving reflected light from the eye.
8 . The instrument of claim 7 , further comprising an eye tracking system configured to track the eye to identify eye deviation.
9 . The instrument of claim 1 , wherein the MEMS scanning mirror comprises:
an elongate mirror having a reflective surface having an elongate cross-section for receiving said beam, said elongate cross-section having a minor axis and a major axis, said elongate mirror having an aperture size that is longer along the major axis than along the minor axis;
a first actuator configured to rotate the mirror about the major axis; and
a second actuator configured to rotate the mirror about the minor axis.
10 . The instrument of claim 9 , wherein the width of the mirror along the minor axis 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.
11 . The instrument of claim 9 , wherein the first actuator is configured to repeatedly rotate the mirror about the major axis through a mechanical range of between +/−12° and +/−20° at a frequency of between 2,000-10,000 Hz, and wherein the second actuator is configured to repeatedly rotate the mirror about the minor axis through a mechanical range of between +/−8° and +/−12° at a frequency of 20-120 Hz.
12 . The instrument of claim 9 , wherein the MEMS scanning mirror is mounted on a rotatable gimbal.
13 . The instrument of claim 9 , wherein said rotatable gimbal is capable of rotating the MEMS scanning mirror through a mechanical range of between +/−5° to +/−10° about the minor axis.
14 . The instrument of claim 9 , wherein the elongate mirror comprises an elliptical mirror having an elliptical cross-section.
15 . The instrument of claim 9 , wherein the diagnostic testing comprises visual acuity testing.
16 . The instrument of claim 9 , wherein the diagnostic testing comprises visual field testing.
17 . The instrument of claim 9 , further comprising a confocal ophthalmoscope receiving reflected light from the eye.
18 . The instrument of claim 17 , further comprising an eye tracking system configured to track the eye to identify eye deviation.
19 - 52 . (canceled)