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Placido ring measurement of astigmatism axis and laser marking of astigmatism axis

A technology of astigmatism axis and laser beam, which is applied in the field of Newton ring measurement of astigmatism axis and laser marking of astigmatism axis, which can solve the problems of limited accuracy and inconvenience

Inactive Publication Date: 2012-12-26
LENSAR LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The use of ink markers reduces the spin effect on astigmatism treatment; however, this is inconvenient as this requires the patient to sit alone under the slit lamp, and compromises accuracy due to unavoidable errors during manual placement of initial markers Limited, and the markings "fall apart" as the tear film reacts with the marking ink

Method used

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  • Placido ring measurement of astigmatism axis and laser marking of astigmatism axis
  • Placido ring measurement of astigmatism axis and laser marking of astigmatism axis
  • Placido ring measurement of astigmatism axis and laser marking of astigmatism axis

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Embodiment Construction

[0020] figure 1 A measurement and treatment system 100 for measuring the axis of corneal astigmatism and for performing ophthalmic surgery on a patient's eye 102 is schematically depicted. System 100 includes telecentric detection system 200 for Placido Ring measurement, lens and cornea positioning system 300 based on Scheimpflug, and therapeutic laser system including therapeutic laser 104 .

[0021] In use, the patient typically lies on a gurney or a recumbent surgical chair that is rolled into position under the optical head of the treatment laser 104 . The telecentricity detection system 200 and the lens and cornea positioning system 300 based on the Sabouraud principle can be designed to work with the patient in a supine position under the therapeutic laser system, since in this supine position the rotation of the eye has already occurred and the rotation of the eye has already occurred. Rotation occurs when a patient who has assumed a sitting position (eg, to allow rout...

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Abstract

A laser treatment system includes a means for measuring an astigmatism axis of a cornea of an eye of a patient and a means for applying a laser beam to the eye. The system includes a means for directing light toward a cornea of an eye of an eye of a patient; and a means for measuring an astigmatism axis of said cornea based on light reflected off of said cornea. The system further includes a means for measuring an astigmatism axis of a cornea of an eye of a patient and a means for determining an apex of said cornea.

Description

[0001] This application is based on 35 U.S.C. §119(e)(1) claiming the invention titled "Placido Ring Measurement of Astigmatism Axis and Laser Marking" submitted on February 1, 2010 of Astigmatism Axis), which is incorporated herein by reference in its entirety. technical field [0002] The present invention relates to a system for performing astigmatism measurements to correct for astigmatism. The invention also relates to marking the measured astigmatism axis using laser generated markings. Background technique [0003] In known astigmatism correction procedures, such as limbal releasing incisions, LASIK or toric IOL implantation, it is important to align the corresponding treatment or device so that it is precisely aligned with respect to the astigmatism axis of the eye. Although each procedure is performed with the patient in the supine position, preoperative astigmatism measurements are routinely performed with the patient in the sitting position. Spinning (rotation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/107
CPCA61F2009/00889A61F2009/0087A61F9/00827A61F9/00825A61B3/1035A61F2009/00872
Inventor R·W·弗雷S·E·博特
Owner LENSAR LLC
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