Reminding method and reminding device

  • US 10,395,510 B2
  • Filed: 12/04/2013
  • Issued: 08/27/2019
  • Est. Priority Date: 08/30/2013
  • Status: Active Grant
First Claim
Patent Images

1. A method performed by a system comprising a processor, comprising:

  • casting a light spot having a pattern to a fundus of an eye of a user;

    collecting at least one image comprising a patterned image, corresponding to the pattern, as presented by the fundus;

    adjusting a first focal length of an adjustable lens on an optical path between the eye of the user and an image collection device, and a first distance from an equivalent lens for the eye to the adjustable lens to collect a clearest image of the patterned image corresponding to the pattern and presented by the fundus, wherein the light spot forms a virtual image through the adjustable lens;

    in response to the clearest image being collected, determining a focusing point position according to the first focal length of the adjustable lens, the first distance from the equivalent lens to the adjustable lens, a second focal length of the equivalent lens, a second distance between the patterned image presented by the fundus and the equivalent lens, an optical distance between the light spot and the adjustable lens, and a third distance between the virtual image and the adjustable lens; and

    obtaining at least one monitoring parameter according to the focusing point position, the at least one monitoring parameter comprising at least one of;

    a first angle between a current sightline of the user and a specific direction, ora second angle between the current sightline of the user and a normal which is on a viewed object and passes through the focusing point position.

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