Diopter calculation method of toric intraocular lens (Toric IOL)

A calculation method and diopter technology, applied in optics, optical components, instruments, etc., can solve problems such as large errors in calculation formulas

Active Publication Date: 2020-10-20
杭州明视康眼科医院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to solve the problem of large error in the calculation formula of Toric IOL diopter in the prior art and improve the accuracy of the calculation formula of Toric IOL diopter, the embodiment of the present invention proposes a calculation method of Toric IOL diopter. After correcting the change of SIA corneal curvature, based

Method used

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  • Diopter calculation method of toric intraocular lens (Toric IOL)
  • Diopter calculation method of toric intraocular lens (Toric IOL)
  • Diopter calculation method of toric intraocular lens (Toric IOL)

Examples

Experimental program
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Effect test

Embodiment

[0072] Example Step 1

[0073] Basic data acquisition

[0074] Crystal selection, confirm factory A constant: A=119.8

[0075] Clinically determined reserved diopter after operation: Post D=0

[0076] Corneal topography examination data: CT = 544, AC = 1.94, Kf1 = 42.30, Kb1 = 6.37, Axis1 = 90, Kf2 = 44.57, Kb2 = 6.42, CT: corneal thickness, AC: anterior chamber depth, Kf1: anterior corneal surface Flat axis curvature, Kb1: flat axis curvature of the posterior corneal surface, Axis1: flat axis of the anterior corneal surface, Kf2: steep axis curvature of the anterior corneal surface, Kb2: steep axis curvature of the posterior corneal surface, biometric inspection data: AL=22.31, LT=4.50, AL: eye axis length, LT: lens thickness, surgical incision position, determine the amount of surgical astigmatism: SIA=0.50, SIA Axis=150,

[0077] Constant: Corneal refractive index: 1.376, aqueous refractive index: 1.336

[0078] Application formula

[0079] Formula 1: K2-K1=Cyl, Cyl Axis=Axis1±90

[0...

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Abstract

The invention discloses a diopter calculation method for a toric intraocular lens. The method comprises the following steps of: calculating the change of the tangential curvature of the front surfaceof a cornea through SIA provided by a doctor after a corneal incision is made, and obtaining the tangential curvatures of a flat axis and a steep axis of the front surface of the cornea; calculating curvature radiuses of flat axis and the steep axis of the front surface of the cornea according to the tangential curvature of the flat axis and the steep axis of the front surface of the cornea, and calculating curvature radiuses of the flat axis and the steep axis of the rear surface of the cornea according to the tangential curvatures of the flat axis and the steep axis of the rear surface of the cornea; further calculating the focal length of the incident light and the output light on the anterior surface of the flat and steep axes, the focal length of the incident light and the output light on the posterior surface and the focal length of the incident light on the intraocular lens according to the radius of curvature, corneal thickness, anterior chamber depth, ocular axis length, intraocular lens parameters and reserved diopter of the anterior and posterior surfaces of the flat and steep axes, and then calculating the diopter of the required IOL flat axis and steep axis.

Description

Technical field [0001] The invention belongs to the field of medical astigmatism type intraocular lens materials, and specifically relates to a method for calculating the refractive power of astigmatism type intraocular lens. Background technique [0002] With the continuous improvement of cataract surgery technology, surgical equipment and intraocular lens (intraocular lens, IOL), cataract surgery has officially entered the era of refractive surgery, and the need for glasses after cataract surgery has also become a topic of concern. However, astigmatism before and after surgery has always been an important factor affecting visual quality after surgery. Among many solutions to correct astigmatism, astigmatism IOL (Toric intraocular lenses, Toric IOL) is the most stable and effective. According to foreign statistics, about 23% to 47% of cataract patients have corneal astigmatism greater than 1.00D, 10% of patients have corneal astigmatism greater than 2.00D, and about 25% of cata...

Claims

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Application Information

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IPC IPC(8): G02B27/00
CPCG02B27/0012
Inventor 郑历张君
Owner 杭州明视康眼科医院有限公司
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