Color Compensating Retinal Safety Filter for Ophthalmic Surgery
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Solution Overview
Problem
Current optical safety filters used in ophthalmic surgical procedures distort color perception due to the filtering of UV radiation, leading to compromised surgeon comfort, efficiency, and surgical outcomes, as they often result in non-color-neutral illumination.
Innovation Solution
A color-compensating retinal safety filter with an optically effective material that blocks wavelengths below 420 nm while transmitting complementary wavelengths above 420 nm, maintaining a luminosity of about 90% and excitation purity of 5% or less, ensuring near-white illumination and retinal safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If UV radiation is filtered from illumination source, then retinal safety is improved, but color perception is distorted
Solution Approach 1:
The patent applies color compensation by transmitting specific visible wavelengths (500-560nm green-cyan range) to counterbalance the yellow tint produced by UV filtration. This selective wavelength transmission restores color neutrality in the illuminated surgical field while maintaining retinal protection from harmful UV and blue-violet radiation
Solution Approach 2:
The filter employs a composite optical design combining multiple wavelength-selective layers or materials: one component blocks UV and blue-violet wavelengths below 480nm, while another component transmits green-cyan wavelengths 500-560nm. This multi-layer composite structure achieves both retinal safety and color compensation simultaneously
2Loss of information
If broad spectrum light is transmitted, then color perception is maintained, but retinal damage risk increases
Solution Approach 1:
The filter extracts and removes harmful wavelength components (UV below 400nm and blue-violet 400-480nm) from the broad spectrum illumination while retaining the beneficial visible wavelengths. This selective extraction achieves retinal protection without significantly compromising color perception in the surgical field
3Object-affected harmful factors
If yellow tinted illumination is used, then retinal safety is improved, but surgical efficiency decreases
Solution Approach 1:
The patent actively compensates for the yellow tint by transmitting green-cyan wavelengths (500-560nm) that counterbalance the yellow color cast. This color correction restores natural color perception in the surgical field, enabling surgeons to accurately assess tissue conditions and improving surgical efficiency while maintaining retinal safety
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
The filter provides a color-neutral lighting scheme that maintains natural color perception for surgeons while effectively blocking harmful UV radiation, enhancing surgical efficiency and outcome quality.
Implementation Method 1
a light transmittance of less than 1% for wavelengths below 420 nm
Implementation Method 2
a light transmittance for wavelengths complementary (or near-complementary) to wavelengths below 420 nm
Data Source
AI summary
A filter and method for filtering an optical beam are disclosed. One embodiment of the filter is an optical filter for filtering an incident light beam, comprising an optically effective material characterized by: a light transmittance of less than 1% for wavelengths below 420 nm; and a light transmittance for wavelengths complementary and near complementary to wavelengths below 420 nm that, combined with the transmittance for wavelengths below 420 nm, will yield a filtered light beam having a luminosity of about 90% and an excitation purity of 5% or less. The complementary wavelengths can be wavelengths above about 640 nm, wavelengths above about 660 nm, and/or wavelengths from about 540 nm to about 560 nm.