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Method and system for determining an eyeglass prescription

A technology for optometry and lenses, which is applied in the field of lens optometry and can solve problems such as unpopular lens optometry

Active Publication Date: 2016-02-17
CARL ZEISS VISION INT GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Of course, offering a lens prescription determined by objective refractive techniques that does not adhere to a lens prescription derived via subjective refractive techniques is undesirable and therefore unlikely to be considered optimal by the patient

Method used

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  • Method and system for determining an eyeglass prescription
  • Method and system for determining an eyeglass prescription

Examples

Experimental program
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Embodiment Construction

[0078] refer to figure 1 , an embodiment of the method 100 generally includes multiple steps, as shown in the flowchart. In a first step 110, the optical phase error of the patient's eye is measured using an objective method. Typically, this involves measuring the wavefront reflected from the eye with suitable sensors. Examples of sensors include various wavefront aberrometers such as Hartmann-Shack wavefront sensors, Tscherning aberrometers, Talbot aberrometers and Dual pass aberrometer. The functional principle of a wavefront aberrometer is described in DE60121123T2, which also includes an overview of a number of different variants.

[0079] The measurement data are used as input to a processing unit which typically comprises an electronic processor (eg a computer). The processing unit establishes a multidimensional optimization space (step 120), for which the processing unit calculates a merit function corresponding to, for example, the visual acuity of the eye. The di...

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PUM

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Abstract

The current invention is directed to a method (100) for determining an eyeglass prescription for an eye, in particular through the use of a non-transitory computer readable medium, the method comprising the steps of providing (110) a measurement Indicative of the refractive properties of the eye; establishing (120) an optimization space corresponding to a plurality of possible eyeglass prescriptions for the eye; determining (140) a merit function, wherein a value of the merit function corresponds to a visual function of the eye when corrected using one of the plurality of possible eyeglass prescriptions within the optimization space, wherein the merit function comprises a term depending on a magnitude of a corrective astigmatism of the one of the plurality of possible eyeglass prescriptions and causing a less optimal value of the merit function the higher the magnitude of the corrective astigmatism and / or the higher the magnitude of a difference between the corrective astigmatism and a subjective corrective astigmatism; and determining (160) the eyeglass prescription by optimizing (150) the value of the merit function, funher, there is suggested 3 system for determining an eyeglass prescription and a corresponding computer program product

Description

technical field [0001] The present disclosure relates to systems and methods for determining lens prescriptions, particularly for vision aids. Background technique [0002] Ametropic human eyes have refractive errors that can be described to a first approximation in terms of spherical, cylindrical, and axial orientations. This is based on the assumption that visual defects can be approximately corrected by lenses with simple surfaces such as toroids and spheres. This approximation is sufficient to correct the refractive errors of rays entering the center of the pupil of the eye. [0003] Although the refractive error of the human eye is usually determined by relying on the subjective refraction of the patient being examined when the patient is presented with multiple vision test fonts by means of lenses with different refractive powers (so-called subjective or manifest refraction) , but the possibility to measure the refractive error of the eye has been available for many ...

Claims

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Application Information

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IPC IPC(8): G02C7/02A61B3/00
CPCA61B3/0025G02C7/028G02C2202/22
Inventor R·S·斯普拉特T·克拉策尔
Owner CARL ZEISS VISION INT GMBH