Ophthalmic Apparatus Prism Component Removal
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Solution Overview
Problem
Conventional ophthalmic apparatuses struggle to accurately estimate the refractive power distribution of the crystalline lens and intraocular lens, especially in eyes with keratoconus, deviated axes, or implanted intraocular lenses in slanted positions, due to the inclusion of a prism component in the internal refractive power distribution.
Innovation Solution
An ophthalmic apparatus and method that input corneal and whole refractive power distribution data, referencing a common axis, to isolate and remove the prism component from the internal refractive power distribution, allowing for precise calculation of the refractive power distribution of the crystalline lens and intraocular lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ophthalmic apparatus calculates internal refractive power distribution using corneal and whole refractive power data, then the refractive power distribution can be obtained, but the calculation becomes inaccurate due to inclusion of prism component in eyes with keratoconus, deviated axes, or slanted intraocular lenses
Solution Approach 1:
The patent segments the internal refractive power distribution into two distinct components: the true refractive power distribution of the crystalline lens or intraocular lens, and the prism component caused by asymmetric optical conditions. By separating these components through mathematical decomposition, the apparatus can accurately identify and remove the prism component, leaving only the true refractive power distribution for accurate estimation.
Solution Approach 2:
The patent extracts the prism component from the total internal refractive power distribution by analyzing the asymmetric characteristics in eyes with keratoconus, deviated axes, or slanted intraocular lenses. This extraction process isolates the harmful prism component, allowing it to be removed from the calculation, thereby improving the accuracy of the remaining true refractive power distribution estimation.
2Adaptability or versatility
If the apparatus processes eyes with keratoconus or deviated axes, then more cases can be diagnosed, but the measurement accuracy deteriorates due to widespread corneal distortion and prism component inclusion
Solution Approach 1:
The patent applies local quality analysis by examining the spatial distribution characteristics of refractive power across different regions of the eye. By identifying localized patterns of distortion specific to keratoconus, deviated axes, or slanted intraocular lenses, the apparatus can differentiate between true refractive power variations and prism component effects, enabling accurate measurements even in these challenging cases.
Solution Approach 2:
The patent explicitly utilizes asymmetry as a diagnostic tool by detecting and analyzing the asymmetric patterns that characterize eyes with keratoconus, deviated axes, or slanted intraocular lenses. Rather than treating asymmetry as an error, the system leverages it to identify and separate the prism component, thereby improving measurement accuracy for these specific asymmetric optical conditions.
Data Source
AI summary
An ophthalmic apparatus and a method for calculating internal refractive power distribution of an eye of an examinee, which allow easily evaluating refractive power distribution of a crystalline lens, an intraocular lens and the like. The ophthalmic apparatus has a unit which inputs respective measurement data on corneal refractive power distribution and whole refractive power distribution of the eye, the respective distribution referring to a reference axis, and a unit which obtains the internal refractive power distribution of the eye referring to the reference axis based on the inputted respective measurement data, obtains a prism component in the internal refractive power distribution with respect to the reference axis, and obtains internal refractive power distribution of the eye where the prism component is removed.