Ophthalmologic testing systems and methods
An optical headset comprises an outer frame that is wearable on the face of a user and an optics module that is removably mounted in the outer frame. The optics module can include a display visible to a wearer of the headset and a display visible to others while the headset is being worn. The outside display can be integral to the outer frame and driven via an electrical interface between the headset frame and the removable optics module. The removable optics module can include separate replaceable subcomponents to allow for easy customization. Various components can be included in the optics module including a rotatable fundus camera.
1. A wearable optical headset system comprising:
a generally tubular outer frame extending between a front portion and a back portion along a central axis, the outer frame having an interior and an exterior, the front portion of the outer frame configured to be pressed against a user's face and surround the eyes of the user;
a headstrap attached to the outer frame and configured to hold the back of the outer frame against the user's face when the headset is worn;
an optics module in an optics module housing having a front surface, a back surface, and a side surface, the optics module comprising (i) computer circuitry including a computer processor, a digital memory connected to the processor and configured to store computer software executable by the processor, and (ii) an optical component comprising at least one of an image display system and an image capture system, the optical component electrically connected to the processor and controllable by the processor in accordance with stored computer software;
the optics module housing slidable within the interior of the outer frame along the central axis and removably engaged to the outer frame and where the front of the optics module is visible through the front portion of the outer frame.
2. The headset system of claim 1 , the optics housing having an outer periphery with a plurality of elastic clips arranged thereon, configured to releasably engage a corresponding plurality of apertures in the outer frame to removably secure the optics module within the outer frame.
3. The headset system of claim 1 , further comprising an electronic display on a back surface of the optics module and configured to output visual data in response to signals from the processor.
4. The headset system of claim 1 , further comprising:
a first electrical interface on the side surface of the optics module and electrically connected to the circuitry in the optics module;
a second electrical interface on the interior of the outer frame;
the first and second electrical interfaces configured to electrically engage when the optics module is mounted within the outer frame.
5. The headset system of claim 4 , further comprising an electronic display on the exterior of the outer frame, the display configured to output visual data in response to signals from the processor in the optics module received through the second electrical interface.
6. The headset system of claim 1 , the optical component comprising a fundus camera, the fundus camera visible through the front portion of the outer frame and having a field of view extending from the front portion allowing imaging of an eye of a user wearing the headset.
7. The headset system of claim 6 , wherein the fundus camera is rotatably mounted to the optics module, wherein rotation of the fundus camera moves the position of the fundus camera field of view relative to the eye of the user wearing the headset.
8. The headset system of claim 1 , wherein the optics module comprises a plurality of modular subcomponents, each subcomponent having a respective housing with a front surface and a back surface, the subcomponents arranged in a stack along the central axis, each subcomponent being removably connected to an adjacent subcomponent.
9. The headset system of claim 1 , the optics module comprising:
a generally planar circuit board having a front and back and having the computer circuitry thereon;
the optical component comprising first and second visual displays with respective front surface on which images can be presented and a back surface, each visual display electrically connected to the circuit board and substantially parallel thereto and having the respective back surface facing the circuit board; and
first and second lens assemblies, positioned respectively in front of the first and second displays, each lens assembly operative to form virtual images of images presented on the corresponding displays, such virtual images appearing to the user wearing the headset to be at a first distance from the user that is greater than an actual distance between the user's eyes and the visual display.
10. The headset system of claim 9 , further comprising:
a lens frame into which the first and second lens assemblies are mounted; and
a front frame forward of the lens frame, the front frame having a front surface visible through the front portion of the outer frame and a back surface facing the first and second displays.
11. The headset system of claim 10 , further comprising fundus camera rotatably mounted to the front surface of the front frame, the fundus camera having an imaging field of view extending forward from the fundus camera, the fundus camera configured to image eye structures of the user when the user is wearing the headset system.
12. The headset system of claim 9 , wherein the first and second lens assemblies each comprise a respective liquid lens having an electrically controllable focus responsive to signals from the computer circuitry.
13. The headset system of claim 12 , wherein adjusting the focus of a respective liquid lens changes the first distance.
14. The headset system of claim 1 , wherein the optical system comprises a retinal image display.
15. The headset system of claim 14 , the retinal image display comprising:
a light emitter configured to emit a beam of light;
an integrator rod positioned to receive the beam of light when being emitted and to output an integrated beam of light;
at least one output lens configured to receive the light beam from the integrator rod and focus the light beam;
a beam splitter in the path of the focused light beam, a portion of the focused light beam exiting the beam splitter and intersecting a face of a digital micromirror device (DMD);
light reflected from the DMD entering the beam splitter, the beam splitter operative to allow a portion of the light reflected from the DMD to pass there through;
a projection lens receiving the portion of the reflected light exiting the beam splitter and
focusing the reflected light for viewing of an image generated by the DMD by a user wearing the headset.
16. The headset system of claim 15 , the at least one output lens comprising a first biconvex lens having a first optical axis, and second biconvex lens having a second optical axis that is not collinear with the first optical axis.