Undilated Macular Pigment Reflectometry via Beam Separation
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Solution Overview
Problem
Current instruments for measuring macular pigment in the eye require pupil dilation, which is uncomfortable for patients and increases procedure time and cost, while also being less accurate and more time-consuming.
Innovation Solution
A reflectometry instrument that uses a light source, spectrometer, and lenses with anti-reflection coatings to measure macular pigment without dilating the pupil, employing beam separation techniques to minimize backscattered light and allow for precise measurement of zeaxanthin and lutein levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pupil dilation is used in current instruments, then measurement coverage is improved, but patient comfort deteriorates and procedure time increases
Solution Approach 1:
The patent divides the measurement process into two distinct beams: an illumination beam for exciting the macular pigment and a detection beam for measuring the reflected light. This segmentation allows the instrument to achieve accurate measurements without requiring full pupil dilation, as each beam is optimized for its specific function and can operate with smaller aperture requirements.
Solution Approach 2:
The patent introduces beam separation optics as an intermediary mechanism between the illumination source and the detection system. By using dichroic mirrors and beam splitters, the instrument can separate the illumination and detection paths, allowing measurements to be taken through the undilated pupil while maintaining measurement coverage equivalent to dilated-pupil instruments.
2Area of stationary object
If pupil dilation is used in current instruments, then measurement coverage is improved, but procedure time increases
Solution Approach 1:
The instrument performs preliminary calibration and alignment using the beam separation optics before actual measurement. The beam splitting and filtering paths are pre-configured to work with undilated pupils, eliminating the time-consuming dilation step while maintaining measurement coverage through the optimized optical path design.
Solution Approach 2:
The patent replaces the mechanical/chemical pupil dilation process with an optical solution using beam separation and filtering. By substituting the dilation step with sophisticated light path management using dichroic mirrors and beam splitters, the instrument achieves the same measurement coverage without the time penalty of administration and waiting for dilation effects.
3Device complexity
If backscattered light is not minimized, then instrument complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent introduces beam separation optics including dichroic mirrors and beam splitters as intermediary elements between the illumination source and detection system. These intermediaries effectively separate the illumination beam from the detection beam, minimizing backscattered light interference while maintaining a manageable instrument design through modular optical components.
Solution Approach 2:
The patent applies anti-reflection coatings selectively to specific optical surfaces where backscatter would most interfere with measurements. By targeting only the critical optical interfaces with specialized coatings rather than treating the entire instrument, the design minimizes complexity while achieving the necessary measurement precision for macular pigment quantification.
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 accurate and efficient measurement of macular pigment without pupil dilation, reducing patient discomfort and procedure time, while providing detailed insights into macular health and potential zeaxanthin supplementation needs.
Implementation Method 1
The first lens, which includes an anti-reflection coating, is adapted to transmit the illumination beam to the macula and also transmits the detection beam from the macula to the spectrometer. A second lens is adapted to transmit the illumination beam to the macula and also is adapted to transmit the detection beam from the macula to the spectrometer. The anti-reflection coating and beam separation helps to minimize the leaking of backscattered light from the illumination beam into the detection beam.
Implementation Method 2
The spectrometer measures a detection beam where the detection beam is a portion of the illumination beam reflected from the macula and is indicative of the amount of macular pigment in the macula.
Implementation Method 3
The first lens, which includes an anti-reflection coating, is adapted to transmit the illumination beam to the macula and also transmits the detection beam from the macula to the spectrometer. A second lens is adapted to transmit the illumination beam to the macula and also is adapted to transmit the detection beam from the macula to the spectrometer. The illumination beam and the detection beam remain separated when the illumination beam and the detection beam pass through the first lens and the second lens.
Data Source
AI summary
A reflectometry instrument includes a light source, a spectrometer, and a first and second lens. The light source emits an illumination beam to the macula. The spectrometer measures a detection beam that is a portion of the illumination beam reflected from the eye and is indicative of the eye characteristics (e.g. macular pigment). The first and second lenses transmit the illumination beam to the macula and transmit the detection beam from the macula to the spectrometer. The instrument is used on an undilated pupil and minimizes unwanted reflections by at least one of the following: the first and second lenses include anti-reflection coatings; the illumination and detection beams pass through the first and second lenses at locations offset from their centers; and the illumination and the detection beams remain separated when passing through the first and second lenses. Zeaxanthin, lutein, and the total macular pigment levels are measured by the instrument.