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Cornea center positioning method for excimer laser cornea refractive surgery

A technology of excimer laser and refractive surgery, which is applied in laser surgery, ophthalmic surgery, ophthalmic treatment, etc. It can solve the problems of increased high-order aberrations of the surgical eye, affecting visual quality, and cutting errors in laser surgery, so as to reduce errors, Effects that improve visual quality

Inactive Publication Date: 2010-08-25
WENZHOU MEDICAL UNIV +1
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Problems solved by technology

Bara thinks [6] Neglect of pupil center shift may lead to unsatisfactory results in wavefront aberration-guided refractive surgery Porter et al. (2006) research on aberration-guided laser surgery showed that the change of pupil center caused by drug-induced mydriasis can reach 0.29 ±0.14mm, which will cause the increase of high-order aberrations in the eye and affect the visual quality
[0005] These findings suggest that the use of laser systems with fixed center shift compensation can cause ablation errors in laser surgery, sometimes significant

Method used

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  • Cornea center positioning method for excimer laser cornea refractive surgery
  • Cornea center positioning method for excimer laser cornea refractive surgery
  • Cornea center positioning method for excimer laser cornea refractive surgery

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Embodiment Construction

[0027] In this specific embodiment, the instrument for obtaining images is the AstraMax three-dimensional corneal topographic map information processing system of the American Raytheon Company. An advantage of the AstraMax three-dimensional corneal topographic map information processing system is that it has the ability to capture images by self-definition, and can simultaneously obtain The image of the eye, Placido ring and pupil, and can also change the illumination level to stimulate the eye to change the pupil size. The illumination setting value is from 0 to 255, which is very suitable for use in this method. AstraMax three-dimensional corneal topography information processing system illumination system includes Placido illumination visual target with a wavelength of 660nm and infrared band illumination with a wavelength of 875nm. Using this method, more than 2 lighting levels should be set as sampling points. Of course, the more sampling points, the more accurate it is. U...

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Abstract

The invention relates to a cornea center positioning method for excimer laser cornea refractive surgery. In the method, a horizontal offset model and a vertical offset model are established by measuring the pupillary diameter and the offset of the pupillary center relative to the center of the corneal vertex under different luminance brightness, and the data of the established models is input into a laser cornea refractive surgery machine with an eye tracking system, so the pupil in the laser cornea refractive surgery is dynamically tracked, the error of the tracking system is reduced, and the visual quality after the laser cornea refractive surgery is obviously improved.

Description

technical field [0001] The invention relates to a corneal center method used in excimer laser corneal refractive surgery. The horizontal offset and vertical offset models are established by measuring the pupil diameter and the shift of the pupil center relative to the corneal apex center under different luminances. , and input the established model data into a laser refractive surgery machine with an eye tracking system, so as to realize dynamic tracking of pupils in laser corneal refractive surgery. Background technique [0002] The pupil is the aperture surrounded by the iris and 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, pupil size also has a great influence on the depth of focus of eye imaging and global aberration. [0003] The positioning and maintenance of the center of corneal ablation is critical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F9/01
CPCA61F9/00804A61F2009/00846A61F9/008A61F2009/00872
Inventor 瞿佳刘党会唐兆凯陈浩陈世豪
Owner WENZHOU MEDICAL UNIV
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