A system for imaging a retina includes an optical relay system having a first lens for positioning proximate to an eye, a light source positioned to illuminate the eye, an image sensor positioned to capture a retinal image of the retina through the first lens, an aperture disposed between the image
A system for imaging a retina includes an optical relay system having a first lens for positioning proximate to an eye, a light source positioned to illuminate the eye, an image sensor positioned to capture a retinal image of the retina through the first lens, an aperture disposed between the image sensor and the first lens along an optical path extending from the image sensor through the first lens, and a processing apparatus. The aperture surrounds the optical path and is adapted to block off-axis reflections from the eye.
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1.-20. (canceled) 21. A system for imaging a retina, the system comprising: an optical relay system including a first lens for positioning proximate to an eye;a light source positioned to illuminate the eye;an image sensor positioned to capture a retinal image of the retina through the first lens;an
1.-20. (canceled) 21. A system for imaging a retina, the system comprising: an optical relay system including a first lens for positioning proximate to an eye;a light source positioned to illuminate the eye;an image sensor positioned to capture a retinal image of the retina through the first lens;an aperture disposed between the image sensor and the first lens along an optical path extending from the image sensor through the first lens, the aperture surrounding the optical path and adapted to block off-axis reflections from the eye; anda processing apparatus communicatively coupled to the image sensor and the light source, wherein the processing apparatus includes logic that when executed by the processing apparatus causes the system to perform operations including: illuminating the eye with the light source; andcapturing the retinal image with the image sensor. 22. The system of claim 21, wherein the light source comprises a plurality of light emitting diodes (LEDs) each located in a different location to illuminate a different portion of the retina of the eye. 23. The system of claim 22, wherein the plurality of LEDs are disposed on either side of the optical path. 24. The system of claim 22, wherein the LEDs are positioned relative to the first lens such that light output from the LEDs does not pass through the first lens prior to illuminating the eye. 25. The system of claim 24, wherein the LEDs are positioned laterally to the first lens. 26. The system of claim 21, wherein the aperture includes one or more optical films configured as a low pass filter to substantially block infrared light from passing through the aperture along the optical path to the image sensor. 27. The system of claim 21, further comprising: an iris camera disposed laterally of the first lens to track movements of the eye using infrared light. 28. The system of claim 21, further comprising: a display coupled to the processing apparatus to output a display image in response to the processing apparatus. 29. The system of claim 28, further comprising: a beam splitter disposed in the optical path between the first lens and the image sensor, the beam splitter adapted to redirect the display image output from the display along the optical path through the first lens for viewing by the eye, wherein the display image comprises visual stimuli to aid alignment of the retina to the image sensor. 30. The system of claim 29, wherein the display image comprise a fixation target for the eye. 31. The system of claim 29, wherein the beam splitter is disposed along the optical path between image sensor and the aperture. 32. The system of claim 29, wherein the optical relay system further comprising: a second lens disposed between the beam splitter and the image sensor; anda third lens disposed between the display the beam splitter. 33. The system of claim 21, wherein the processing apparatus includes further logic that when executed by the processing apparatus causes the system to perform further operations including: capturing a sequence of images of the retina while a diameter of a pupil of the eye is changing in response to illumination from the light source, wherein at least some images of the retina in the sequence of images are acquired with different f-stops due to the diameter of the pupil changing in size during the illuminating; andcombining the at least some images in the sequence of images to form a composite image having a larger depth of field than any individual image in the sequence of images. 34. The system of claim 33, wherein the processing apparatus includes further logic that when executed by the processing apparatus causes the system to perform further operations including: changing a level of illumination output from the light source and directed toward the retina, wherein the sequence of images are captured as the level of illumination output from the light source changes. 35. The system of claim 34, wherein the different f-stops are achieved in response to the diameter of the pupil in the eye increasing or decreasing in size from changing the level of illumination from the light source. 36. The system of claim 33, wherein the image sensor is adapted to capture the sequence of images at a frame rate of at least 200 frames per second, and wherein the sequence of images includes at least 10 images. 37. A system for imaging a retina, the system comprising: an optical relay system including a first lens for positioning proximate to an eye;an image sensor positioned to capture a retinal image of the retina through the first lens;a light source for generating illumination of the eye;a display to output a fixation target;a beam splitter disposed in an optical path extending from the image sensor through the first lens, the beam splitter positioned between the image sensor and the first lens and adapted to redirect the fixation target output from the display along the optical path out through the first lens for viewing by the eye; anda processing apparatus communicatively coupled to the image sensor, the light source, and the display, wherein the processing apparatus includes logic that when executed by the processing apparatus causes the system to perform operations including: generating the fixation target;illuminating the retina of the eye with the light source; andcapturing the retinal image with the image sensor while illuminating the eye. 38. The system of claim 37, further comprising: a first aperture disposed between the image sensor and the first lens along the optical path, the first aperture surrounding the optical path and adapted to block off-axis reflections from the eye; 39. The system of claim 37, wherein the processing apparatus includes further logic that when executed by the processing apparatus causes the system to perform further operations including: capturing a sequence of images of the retina while a diameter of a pupil of the eye is changing in response to the illumination from the light source, wherein at least some images of the retina in the sequence of images are acquired with different f-stops due to the diameter of the pupil changing in size during the illuminating; andcombining the at least some images in the sequence of images to form a composite image having a larger depth of field than any individual image in the sequence of images. 40. The system of claim 37, further comprising: a user interface coupled to the processing apparatus, the user interface providing a mechanism to commence capture of the sequence of images of the retina. 41. The system of claim 37, wherein the light source comprises a plurality of light emitting diodes (LEDs) disposed on either side of the optical path for illuminating different portions of the retina.
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