Method for calculating refractive correction amount in corneal refractive surgery
AssigneeNidek Co., Ltd.
InventorsArturo S. Chayet, Yoshitaka Suzuki
Life of this patent
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Abstract
An apparatus for operation on a cornea by ablating with a laser beam for correcting ametropia; the apparatus comprising an input device utilized for inputting each data necessary for correction, a first correcting device for irradiating a laser beam for correcting myopic astigmatism, a second correcting device for irradiating a laser beam for correcting hyperopic astigmatism, a calculating device for calculating each correction-data based on the each inputted data in case of combining the first and second correcting means, and a control device for ablating the cornea by controlling the first and second correcting means based on results calculated by the calculating device.
Claims4
A method for calculating an ablation amount for refractive correction in corneal refractive surgery to be achieved by ablating an optical zone of a cornea of an eye to be operated with a laser beam, the method comprising:
- a first step of inputting data necessary for correcting simple myopic astigmatism or mixed astigmatism;
- and
- a second step of dividing a total ablation amount into a first ablation amount for myopic astigmatism correction and a second ablation amount for hyperopic astigmatism correction based on the inputted data in accordance with a given standard, in the myopic astigmatism correction, a portion of the cornea closer to a weak principal meridian being ablated more and a portion of the cornea farther from the weak principal meridian being ablated less, and in the hyperopic astigmatism correction, a portion of the cornea closer to a strong principal meridian being ablated less and a portion of the cornea farther from the strong principal meridian being ablated more.
Dependencies are inferred from the claim text.