Accurate and Robust Eye Tracking with a Scanning Laser Ophthalmoscope

Tech ID: 24344 / UC Case 2015-025-0

Patent Status

Country Type Number Dated Case
United States Of America Issued Patent 10,130,253 11/20/2018 2015-025
 

Brief Description

The tracking scanning laser ophthalmoscope (TSLO) provides fast and accurate measurements of fixational eye motion with flexible field of views. Currently, this system is the most accurate, fast and functional eye-tracking system used in a standard ophthalmic instrument. At a basic research level, the benefits of accurate eye-tracking are especially useful for delivering stimuli to targeted retinal locations as small as a single cone. In the clinical domain, advances in imaging and tracking technology help render accurate images which can lead to better outcomes in treating eye disease. Scanning laser ophthalmoscopy (SLO) uses both a horizontal and vertical scanner to image a specific region of the retina. Current state of the art tracking SLO systems are only suitable for observing a narrow field of view (FOV < five degrees) and will lose signal with certain types of eye motion. This is problematic for patients suffering from varying retinal or neurological disorders, where unstable fixation hinders accurate eye-tracking and image acquisition. These include retinal diseases of the macula such as: age-related macular degeneration, or neurological disorders such as: Alzheimer's and Parkinson's disease. In cases such as these, it would be desirable to capture a larger field of view whose image quality is sufficient to track the retina for larger and more rapid eye movements. To help address this problem, researchers at the University of California, Berkeley have developed systems, software, and methods for an image-based high-performance TSLO. Early laboratory experimentation results suggest significantly enhanced eye-tracking in terms of: sampling uniformity of eye motion traces, detection of eye rotation, increased frame rate of image capture, expandable/adjustable FOV, stabilization accuracy of 0.66 arcminutes, and tracking accuracy of 0.2 arcminutes or less across all frequencies. The Berkeley system and techniques show promise for observing detailed structural and functional changes in the eye as a result of age and/or disease like never before.

Suggested uses

  • Clinical diagnostic imaging of retina 
    • e.g. glaucoma, macular degeneration, other retinal disorders
  • Research study of retina
  • Generation of eye motion signals to guide other ophthalmic devices e.g. 
    • Optical coherence tomography (OCT)
    • Adaptive optics scanning laser ophthalmoscopes (AOSLO)
    • Electroretinography (ERG)

Advantages

  • Leverages industry-standard ophthalmic platforms
  • Small footprint, low cost, robust TSLO
  • Captures up to 10 degrees of eye motion while simultaneously acquiring high quality video

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Keywords

ophthalmoscopy, confocal imaging, retinal tracking, tracking scanning laser ophthalmoscope, TSLO, scanning laser ophthalmoscopy, SLO, glaucoma, macular degeneration, OCT, AOSLO, ERG, AMD, ARMD, retinal image tracking, gaze contingent, ophthalmic optics

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