Polarization Filtering for Eye Imaging Contrast
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Solution Overview
Problem
In standard laser eye surgery systems, the low reflectivity of the retinal pigment epithelium layer due to melanin absorption combined with significant reflections from the cornea's anterior surface creates a low contrast ratio, making it challenging to optically image the eye surgical site effectively.
Innovation Solution
An optical device incorporating an incident light polarizer and a corneal light polarizer, along with a rotating mechanism, is used to polarize light and separate reflections from the cornea and retina, enhancing contrast by attenuating corneal reflections and maintaining retinal light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If standard lighting is used for eye imaging, then the imaging process is simple, but the contrast ratio is low due to corneal reflections mixing with retinal light
Solution Approach 1:
The patent changes the polarization parameter of the incident light to improve contrast. By setting the polarization direction of incident light at a specific angle (e.g., 45 degrees) relative to the corneal meridian, the system exploits polarization differences between corneal and retinal reflections to enhance contrast ratio without adding complex optical components.
Solution Approach 2:
The patent introduces polarization as an intermediary property to separate corneal and retinal reflections. By utilizing the different polarization characteristics of light reflecting from the cornea versus the retina, the system can filter out corneal glare and enhance retinal imaging contrast through polarization-based separation.
2Measurement precision
If polarization filtering is applied to reduce corneal reflections, then the contrast ratio improves, but the device complexity increases due to additional polarizers and rotating mechanisms
Solution Approach 1:
The patent employs a rotating polarizer mechanism that can dynamically adjust the polarization angle to optimize contrast for different eye conditions and lighting conditions. This dynamic adjustment capability allows the system to adapt to varying corneal orientations and maximize the contrast enhancement effect.
Solution Approach 2:
The patent divides the optical path into separate components: an incident light polarizer before the eye and a corneal light polarizer in the return path. This segmentation allows independent optimization of each polarizer's function and enables complex polarization filtering effects using simpler individual components.
3Ease of operation
If the polarization angle is fixed, then the device operation is simple, but the system cannot adapt to different corneal orientations and lighting conditions
Solution Approach 1:
The patent implements a rotating mechanism that allows the polarization angle to be dynamically adjusted during operation. This enables the system to adapt to different corneal orientations, lighting conditions, and patient-specific characteristics while maintaining ease of operation through intuitive control interfaces.
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
This solution improves the contrast ratio during eye imaging and surgery by filtering out corneal reflections, providing a clearer view of the retinal area, thus aiding in precise laser eye surgery and imaging.
Implementation Method 1
an incident light polarizer positioned to receive incident light and configured to polarize incident light such that polarized incident light is directed to a cornea of a subject
Implementation Method 2
at least one corneal light polarizer positioned to receive reflected light from the cornea of the subject and polarize the reflected light to a second polarization
Implementation Method 3
at least one rotating mechanism coupled with the incident light polarizer and/or the corneal light polarizer
Data Source
AI summary
An optical device can include: an incident light polarizer positioned to receive incident light and configured to polarize incident light such that polarized incident light is directed to a cornea of a subject; at least one corneal light polarizer, wherein the at least one corneal light polarizer is positioned to receive reflected light from the cornea of the subject and polarize the reflected light to a second polarization; at least one rotating mechanism; and at least one receiver. The receiver can be at least one viewing port optically coupled with the at least one corneal light polarizer or an imaging device (e.g., optical detector). The at least one rotating mechanism is: coupled with the incident light polarizer; coupled with the at least one corneal light polarizer; or coupled with the incident light polarizer and the at least one corneal light polarizer.