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Method for accurate alignment of corneal vertex

A technology of precise alignment and corneal apex, which is applied in the direction of eye testing equipment, medical science, ophthalmoscope, etc., can solve the problem that the corneal apex and the main optical axis of the system optical path cannot be accurately aligned, and achieve automatic adjustment and measurement Precise, fast-acting results

Active Publication Date: 2014-03-26
SHENZHEN CERTAINN TECH CO LTD
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Problems solved by technology

[0004] The invention discloses a method for precise alignment of the corneal apex, aiming to solve the problem that the corneal apex and the main optical axis of the system optical path cannot be accurately aligned

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  • Method for accurate alignment of corneal vertex
  • Method for accurate alignment of corneal vertex
  • Method for accurate alignment of corneal vertex

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Embodiment Construction

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0037] refer to figure 2 The method for using the corneal apex to accurately and automatically align according to the present invention comprises the following steps:

[0038] S101: Use iris imaging to find the pupil of the subject, and adjust the center of the pupil to the vicinity of the convergence point of several scanning lines of the scanning device;

[0039] S102: The scanning device scans the cornea of ​​the subject, and the computer processes the scanning data to obtain a corneal OCT tomogram;

[0040] S103: The computer calculates the distance L betwee...

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Abstract

The invention discloses a method for accurate alignment of a corneal vertex. The method comprises the steps that (1), the pupil of a tested person is found through iris imaging, and the center of the pupil is adjusted to be nearby the center rendezvous point of a plurality of scanning lines of a scanning device; (2), the scanning device scans the pupil of the tested person, a computer processing scanning data, and then a pupil OCT is obtained; (3), the computer computes the distance L between a center reflection column in the pupil OCT and the center line of the pupil OCT; (4), the amount of movement of the head of the tested person or the scanning device is computed according to the scanning angle theta of the scanning lines and the distance L, the head of the tested person or a probe of the scanning device is moved, and the corneal vertex of the tested person is made to accurately align with a main optical axis of a system light path. The method has the advantages that the accurate alignment of the corneal vertex is achieved, the adjusting method is simple and rapid and can be divided into automatic adjusting or semi-automatic adjusting, the adjusting modes are various, and operation is easier.

Description

technical field [0001] The invention belongs to the field of ophthalmic OCT, and in particular relates to a method for precisely aligning corneal vertices. Background technique [0002] In many ophthalmic medical instruments, the main optical axis of the optical path of the instrument needs to be aligned with the pupil of the human eye or the apex of the cornea. In existing instruments, iris recognition is often used to align pupils. However, due to differences in the shape of different human eyes, after the pupil center is aligned, the corneal apex may not be aligned with the main optical axis of the system optical path. There are two reasons: First, there is a certain angle between the optical axis of the human eye and the visual axis, and the angle between different human eyes is different. During the actual operation of the instrument, the human eyes to be tested stare at a certain fixation point, but the fixation point cannot be used to accurately determine the angle ...

Claims

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Application Information

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IPC IPC(8): A61B3/15A61B3/12
Inventor 李鹏王辉王宁利代祥松
Owner SHENZHEN CERTAINN TECH CO LTD
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