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Computer-implemented method for detecting corneal vertices

A corneal vertex, computer technology, applied in computer parts, computing, eye testing equipment, etc., can solve problems such as image overlap, camera arrangement limitations, etc.

Active Publication Date: 2020-10-02
CARL ZEISS VISION INT GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Correspondingly, the premise is that the images mostly overlap, so the choice of camera arrangement is severely limited

Method used

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  • Computer-implemented method for detecting corneal vertices
  • Computer-implemented method for detecting corneal vertices
  • Computer-implemented method for detecting corneal vertices

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Embodiment approach

[0040] 1. A computer-implemented method for detecting the corneal apex, wherein a frontal image of the head and a lateral image of the head are provided, these images being calibrated to each other, wherein, from the frontal image and the The profile image determines the spatial position of the corneal apex.

[0041] 2. The computer-implemented method according to item 1, characterized in that triangulation is used in determining the geometric position.

[0042] 3. The computer-implemented method according to item 1 or 2, characterized in that the position of the corneal apex is corrected for calculation.

[0043] 4. The computer-implemented method according to one of the preceding items, characterized in that the position of the corneal apex in space is determined in a first approximation as an intersection point q, which is the side camera that captures the side image Intersection of a first line of sight ( 52 ) tangential to the cornea ( 50 ) of ( 16 b ) and a second line ...

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Abstract

The invention relates to a computer-implemented method for detecting a corneal vertex, in which a frontal image of the head and a lateral image of the head are provided, these images are calibrated with respect to one another, wherein the geometrical position is determined from the frontal image and the The lateral image is used to determine the position of the corneal vertex in space.

Description

technical field [0001] The present invention relates to a computer-implemented method for detecting the corneal apex. Background technique [0002] The apex of the subject's cornea is important in determining the centering parameters used to adjust the eyeglasses. The centering parameters are used to correctly arrange or center the spectacle lens in the spectacle frame so that the spectacle lens is arranged in the correct position relative to the eyes of the person wearing the spectacle. Here, sometimes it is an anatomical parameter of the person concerned (e.g. pupillary distance), sometimes it is a frame-only parameter (e.g. lens width or lens height), sometimes it is a combination of anatomical and frame-related parameters (e.g. corneal vertex distance and perspective height). DIN EN ISO 13666 of October 2013 gives an overview of common centering parameters. [0003] At least approximately determining the spatial position of the corneal apex, preferably two spatial pos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/14G06K9/00
CPCA61B3/14G06V40/193A61B3/10A61B3/111G02C13/003G02C13/005A61B3/107G06T7/73G06T2207/30041A61B3/1005G01M11/0207G02C7/061G02C2202/22
Inventor C.妞文休斯O.施瓦茨M.甘珀林
Owner CARL ZEISS VISION INT GMBH
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