Cornea center positioning method for excimer laser corneal refraction surgery

Abstract

The invention discloses a cornea center positioning method for excimer laser corneal refraction surgery, which comprises the following steps of: setting an illumination brightness value, concentrating the illumination brightness value on a cornea part, acquiring and recording pupil size and the position of the pupil center relative to the vertex center of a corneal topographic map through an instrument, and transmitting the collected image to a computer processing equipment; meanwhile, collecting the diameter R of the pupil through the computer processing equipment, the computer processing equipment is used for determining a value taking area according to the circle center of the pupil, all points are selected in the area according to accumulated values and set as the circle center to be determined, meanwhile, the distance between the boundary point and the circle center is calculated, the accumulated value data are compared, therefore, the linear distance between the circle center of the cornea and the circle center of the pupil is obtained, manual positioning and sensory positioning by a doctor are not needed, the accuracy of cornea center positioning is guaranteed, meanwhile, errors are greatly reduced, and actual application and operation are facilitated.

Description

technical field [0001] The invention belongs to the technical field of excimer laser corneal refractive surgery, in particular to a corneal center positioning method for excimer laser corneal refractive surgery. Background technique [0002] In existing life, excimer laser corneal resurfacing is the first surgical method to use laser to correct refractive errors in ophthalmology. In recent years, LASIK and LASEK are both developed on the basis of PRK surgery, and the pupil is formed by the iris The aperture is an important part of the optical system of the human eye. Its main function is to maintain the stability of the light entering the fundus under different lighting environments by changing its size. In addition, the size of the pupil also has a great impact on the depth of focus of the eye imaging and the aberration of the whole eye. , in laser refractive surgery, the positioning and maintenance of the center of corneal ablation is crucial, especially in aberration-guid...

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Problems solved by technology

[0003] However, in the prior art, the positioning of the center of the cornea mostly relies on the doctor's senses and the center of the pupil for simple positioning. However, this positioning method has many external factors, and the positioning results are not accurate enough, which is extremely challenging to the doctor's experience and Sensory operation, and when the doctor is tired during the operation, it is easy to cause inaccurate positioning of the corneal center, which is not conducive to practical application and operation

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