Selective Wavefront Sensing for Diffractive-Refractive IOL Refraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems struggle to accurately measure the refractive power of an eye with an implanted combined diffractive-refractive intraocular lens due to the distortion and smearing of light spots caused by the diffractive regions, leading to inaccurate wavefront data and refractive measurements.
Innovation Solution
A method and device that utilize a wavefront sensor to selectively process light spots from the refractive region of a combined diffractive-refractive intraocular lens, excluding data from the diffractive regions, to determine the eye's refraction by using a processor to analyze the wavefront data from a defined region of the detector array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wavefront sensor processes all light spots from the eye including diffractive regions, then complete wavefront data is captured, but measurement precision deteriorates due to distortion and smearing from diffractive regions
Solution Approach 1:
The patent divides the detector array into multiple regions corresponding to different zones of the intraocular lens (central refractive region vs. peripheral diffractive regions). By segmenting the data collection area, the system can process wavefront data from the refractive region independently, excluding the distorted data from diffractive regions, thus maintaining measurement precision while managing processing complexity through regional analysis.
Solution Approach 2:
The patent extracts and isolates wavefront data specifically from the refractive region of the intraocular lens, separating it from the diffractive region data. This extraction approach allows the system to use only the undistorted light spots from the refractive region for refraction measurement, eliminating the harmful effects of diffractive region distortion while maintaining complete data collection capability.
2Adaptability or versatility
If the system includes both refractive and diffractive regions in the IOL, then multifocal vision is achieved, but measurement accuracy deteriorates due to light spot distortion from diffractive regions
Solution Approach 1:
The patent applies different processing qualities to different regions of the detector array. Light spots from the central refractive region are processed with standard wavefront analysis, while light spots from the peripheral diffractive regions are either excluded or processed separately. This local quality differentiation allows the system to maintain measurement accuracy for the refractive component while preserving the multifocal capability of the IOL through the diffractive regions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate measurement of the refractive power of an eye with a combined diffractive-refractive intraocular lens by isolating and processing wavefront data from the refractive region, thereby improving measurement precision and accuracy.
Implementation Method 1
passing a probe beam to the retina of an eye through a combined diffractive-refractive intraocular lens
Implementation Method 2
a first set of light spots which returned from the retina through the refractive region of the combined diffractive-refractive intraocular lens
Implementation Method 3
one or more separate diffractive regions which focus light by constructive interference produced by features such as rings that are etched or otherwise fabricated into the optical element
Implementation Method 4
focus light by constructive interference produced by features such as rings
Data Source
AI summary
A method and device: pass a probe beam to the retina of an eye through a refractive region of a combined diffractive-re-fractive intraocular lens (IOL) which is implanted into the eye; provide light returned from the retina to a wavefront sensor which includes a detector array and images the returned light onto the detector array to produce a first set of light spots which returned from the retina through the refractive region of the combined diffractive-refractive IOL and a second set of light spots which returned from the retina through a diffractive region of the combined diffractive-refractive IOL; select a first region of the detector array which includes at least some of the first set of light spots and excludes the second set of light spots; and determines a refraction of the eye with the combined diffractive-refractive IOL implanted therein using only data from the first set of light spots.