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Ocular surface interferometry (OSI) devices and systems for imaging, processing, and/or displaying an ocular tear film

  • US 9,693,682 B2
  • Filed: 06/09/2014
  • Issued: 07/04/2017
  • Est. Priority Date: 04/01/2009
  • Status: Active Grant
First Claim
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1. An apparatus for measuring a tear film layer thickness (TFLT) of an ocular tear film, comprising:

  • a control system configured to;

    (a) receive at least one first image containing optical wave interference of specularly reflected light and a background signal from a region of interest of an ocular tear film captured by an imaging device while illuminated by a multi-wavelength light source;

    (b) detect whether an eyelid blink was captured by the imaging device in the at least one first image;

    (c) remove any images in the at least one first image on which the eyelid blink was detected to produce at least one resulting image;

    (d) convert at least a portion of the at least one resulting image representing the optical wave interference of specularly reflected light from at least a portion of the region of interest of the ocular tear film into at least one color-based value;

    (e) compare the at least one color-based value to a tear film layer optical wave interference model; and

    (f) measure a TFLT of the at least a portion of the region of interest of the ocular tear film based on the comparison of the at least one color-based value to the tear film layer optical wave interference model.

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