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Placido disc surface design method based on simulated annealing algorithm

A simulated annealing algorithm and design method technology, applied in the field of optometry, can solve problems such as small application range and complex surface processing, and achieve the effects of reducing design difficulty, improving precision, and reducing aberration

Pending Publication Date: 2021-08-03
上海观爱医疗科技有限公司
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Problems solved by technology

However, the application range of this design is small, and the surface processing is complicated

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  • Placido disc surface design method based on simulated annealing algorithm
  • Placido disc surface design method based on simulated annealing algorithm
  • Placido disc surface design method based on simulated annealing algorithm

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Embodiment Construction

[0038] In order to further clearly illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings. The accompanying drawings of the present invention are simple and easy-to-read structural framework diagrams, and cannot limit the real purpose of the present invention. In addition, in order to make the embodiments of the present invention easy to understand, the detailed descriptions of the technical features involved in the various embodiments of the present invention described below do not strictly pursue professionalism, as long as the functions do not conflict with each other, they can be combined with each other.

[0039] The present invention proposes a Placido disk surface design method based on a simulated annealing algorithm, combining figure 1 shown, including:

[0040] Step 1. According to the design requirements, the distance H between the apex o...

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Abstract

The invention provides a Placido disc design method based on a simulated annealing algorithm, which comprises the following steps: presetting the distance from a corneal vertex to a Placido disc vertex in a corneal topography instrument and the distance from the corneal vertex to a diaphragm in the corneal topography instrument as initial conditions for subsequent optimization; setting an expression corresponding to the surface type of the Placido disc; calculating an aberration function at the diaphragm according to an aberration principle; and performing simulated annealing operation by taking the aberration function as an evaluation function and the Placido disc surface parameter as a variable, and calculating to obtain the Placido disc surface parameter when the aberration is minimum. The Placido disc formed through calculation of the method has the advantages that the small aberration is achieved at the diaphragm, the design difficulty of a follow-up lens group is reduced, and the follow-up image processing precision can be improved.

Description

technical field [0001] The invention relates to the technical field of optometry, in particular to a Placido disc surface design method based on a simulated annealing algorithm. Background technique [0002] The cornea provides most of the refractive power of the eye's optical system, accounting for more than 70% of the total refractive power. Therefore, its small changes will cause huge changes in the refractive state of the human eye, which will have a significant impact on the clarity of the image focused on the retina and affect people's vision. Therefore, accurate measurements of the cornea are required. [0003] The corneal topographer system based on the Placido disk uses a series of black and white concentric rings as the object surface, which are imaged on the sensor through the cornea, and the sensor is located behind the central hole of the plate, and the computer analyzes the virtual image reflected by the cornea to obtain different positions of the cornea curv...

Claims

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Application Information

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IPC IPC(8): G06F30/20A61B3/107G06F111/06
CPCA61B3/107G06F30/20G06F2111/06
Inventor 田苗吴春波张培茗曾祥堉
Owner 上海观爱医疗科技有限公司
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