Variable Power Measuring Lens for Higher Order Aberration Correction
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Solution Overview
Problem
Existing measuring instruments, such as the Jackson cross cylinder, are limited in their ability to determine the necessary correction for higher order aberrations like coma, trefoil, and secondary astigmatism, which affect vision but cannot be easily corrected with current spherical and cylindrical lenses.
Innovation Solution
A measuring instrument with a measuring lens that has a gradually changing strength or shape in at least one direction, allowing for the determination of higher order aberration corrections through subjective refraction, where the patient compares image effects in different positions to choose the best image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Jackson cross cylinder with constant cylindrical strengths is used for measuring, then lower order aberrations can be determined, but higher order aberrations cannot be determined
Solution Approach 1:
The patent applies parameter changes by transitioning from constant cylindrical strengths to continuously variable lens powers. The measuring lens allows continuous adjustment of optical power in multiple directions, enabling the determination of higher order aberrations while maintaining the ability to correct lower order aberrations through subjective refraction.
2Reliability
If spherical and cylindrical lenses are used for correction, then lower order aberrations can be corrected, but higher order aberrations cannot be corrected
Solution Approach 1:
The patent applies dynamics by implementing a measuring lens with continuously variable optical power that can be adjusted in multiple directions. This dynamic capability allows the instrument to determine and subsequently correct higher order aberrations, expanding the range of correctable vision defects beyond what static spherical and cylindrical lenses can achieve.
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 the determination of the required corrections for higher order aberrations, improving vision by allowing for personalized spectacle lens and contact lens prescriptions, as well as refractive surgery corrections.
Implementation Method 1
the measuring lens has a first strength in a first direction in the plane of the measuring lens and through the centre of the measuring lens and having a second strength in a second direction at an angle to the first direction
Data Source
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AI summary
The measuring instrument has a measuring lens that has two different wavefronts in at least two directions that are perpendicular to each other with strengths that gradually increase from a value of -W to a value of +W. The measuring instrument also has a handle that is held up in two different positions that differ by 45 degrees during the determination of the amount of higher order aberrations to be corrected. With the handle in the direction of the wavefront, the strength of the wavefront is determined by turning the handle 180 degrees around the axis. By turning the position of the handle 45 degrees, the axis direction of the wavefront is determined by turning the handle 180 degrees around the axis. This measuring instrument can be used to determine the corrective value of a spectacle lens and contact lens, which can be used to correct higher order aberrations and is also useful in refractive surgery.