Refraction Shift Model for Optical Filter Prescription
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Solution Overview
Problem
The use of optical filters in eyeglasses can induce ametropic shifts in the eye, affecting visual performance and comfort by altering the optimal focus on the retina, which complicates the determination of corrective lens prescriptions.
Innovation Solution
A device and method using a refraction shift model to determine the shift in refraction value of the eye induced by an optical filter, utilizing a processor and memory to analyze initial spectral features of a light source and optical filter, and calculate the shift based on spectral features transmitted to the eye, without requiring direct measurements on the subject.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical filters are used in eyeglasses to protect the ocular system and improve visual performance, then visual comfort and protection are improved, but ametropic shifts are induced that complicate the determination of corrective lens prescriptions
Solution Approach 1:
The patent calculates the refraction shift induced by the optical filter in advance, before determining the corrective lens prescription. By computing the shift based on the filter's spectral transmission characteristics and the subject's ocular media transmission, the system prepares compensation data beforehand, simplifying the overall prescription determination process while maintaining accuracy.
Solution Approach 2:
The patent introduces an intermediary calculation model that bridges the optical filter characteristics and the refraction shift. This model uses the spectral transmission of the filter and the subject's ocular media to compute the induced refraction shift, serving as a mediator between the filter properties and the corrective lens prescription requirements.
2Measurement precision
If precise measurements of refractive error with actual spectral transmission are performed to achieve accurate focus, then measurement precision is improved, but the measurement process becomes long and tedious
Solution Approach 1:
The patent replaces direct mechanical/optical measurement procedures with a computational model. Instead of performing time-consuming physical measurements of refractive error with actual spectral transmission, the system uses a refraction shift model that calculates the shift based on spectral transmission characteristics, achieving comparable or superior precision much faster.
Solution Approach 2:
The patent creates a computational copy or model of the optical system's spectral transmission characteristics. By using the spectral transmission data of the filter and ocular media as input to the refraction shift model, the system obtains virtual measurements that represent the actual refractive effect without requiring direct physical measurement on the subject.
3Adaptability or versatility
If optical filters alter the wavelength distribution of light to achieve specific visual effects or protection, then visual performance in specific conditions is improved, but the optimal focus point on the retina shifts causing fatigue
Solution Approach 1:
The patent incorporates feedback by calculating the refraction shift induced by the optical filter and using this information to adjust the corrective lens prescription. This feedback loop ensures that the prescription accounts for the filter's effect on wavelength distribution and focus, thereby maintaining optimal visual performance and reducing fatigue in different lighting conditions.
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 quick and accurate determination of ametropic shifts, allowing for improved visual performance and comfort by adapting corrective lens prescriptions to compensate for filter-induced refraction changes, reducing fatigue and enhancing visual acuity.
Implementation Method 1
an optical filter through which said light beam is transmitted to the eye of the subject
Implementation Method 2
determining a shift in a refraction value of an eye of a subject induced by an optical filter
Implementation Method 3
a light beam emitted by a light source
Implementation Method 4
one or more values of one or more initial spectral features of said light source
Data Source
AI summary
A device for determining a shift in a refraction value of an eye lighted by a light beam emitted by a light source and transmitted through an optical filter, wherein the device includes a memory storing a value of an initial spectral feature of the light source, a value of an optical feature of the optical filter, and a refraction shift model linking a magnitude associated with the shift and a spectral feature of the light beam. Further, the device includes processors programmed to determine a value of a spectral feature of the light beam based on the value of the initial spectral feature of the light source and the value of the optical feature of said optical filter; and determine the shift based on the refraction shift model and the value of the spectral feature of the light beam.