Glare Reduction in Surgical Microscopes via Liquid Crystal Arrays
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Solution Overview
Problem
Surgical microscopes face challenges in reducing glare from the fluid-air interface during ophthalmic surgeries, which disrupts the surgeon's view and requires additional time to recover clear vision.
Innovation Solution
An ophthalmic surgical microscope with a controllable optical element, such as a liquid crystal array, that selectively limits the transmission of light associated with glare by processing image data from an image sensor to generate control signals and adjust the optical element to block glare while allowing other light to pass through.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source provides bright illumination to maintain continuing vision of the surgical field, then the surgeon can see the surgical field clearly, but glare is reflected from the fluid-air interface towards the surgeon
Solution Approach 1:
The optical element is divided into multiple independently controllable regions or pixels, allowing selective modulation of light transmission for different areas of the surgical field. This enables targeted glare reduction at specific locations (such as the fluid-air interface) while preserving illumination and visibility in other areas.
Solution Approach 2:
Different regions of the optical element have different light transmission properties - areas corresponding to glare sources have reduced transmission while areas corresponding to the surgical field maintain normal transmission. This local differentiation allows simultaneous glare reduction and surgical field illumination.
2Loss of information
If the surgeon views the surgical field through the microscope during fluid-air exchange, then the surgeon can monitor the procedure, but the glare saturates the visual field and makes it difficult to see the patient's eye
Solution Approach 1:
The optical element acts as an intermediary component between the surgical field and the surgeon's eye. It selectively modulates light transmission, attenuating glare photons while allowing surgical field photons to pass through, thereby mediating the conflict between glare reduction and surgical visibility.
3Loss of time
If the surgeon looks away or blinks from the surgical microscope, then the surgeon can rest, but the glare persists in the visual field and takes extra time to pass
Solution Approach 1:
The system uses an image sensor to detect glare in real-time, processes the image data to identify glare locations and intensities, and uses this feedback to dynamically adjust the optical element. This closed-loop control allows the system to respond to changing glare conditions and maintain optimal visualization throughout the surgical procedure.
4Productivity
If conventional surgical microscopes are used without glare reduction, then the device complexity remains low, but the glare disrupts the surgical procedure and requires additional time
Solution Approach 1:
The optical element serves multiple functions: it acts as a beam splitter to direct light to the image sensor, a modulator to control light transmission to the surgeon, and a glare reduction device to attenuate reflected light. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
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 surgical procedure efficacy by enhancing spatial awareness and reducing high-brightness light interference, allowing for clearer visualization of the surgical field without affecting essential illumination.
Implementation Method 1
an optical element controllable to selectively limit the transmission of light associated with glare from a surgical field to an observer
Implementation Method 2
The optical element comprises a liquid crystal array. Controlling an optical element includes providing the control signal to a voltage source in communication with the liquid crystal array
Data Source
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Figure 2b
AI summary
Surgical microscope (100) positioned in an optical pathway between an observer (102) and a surgical field (104), comprising an image sensor (124) receiving light reflected by the surgical field (104), a computing device (118) in communication with the image sensor (124) and identifying portions of the light received on the image sensor (124) associated with glare from the surgical field (104) and generating a control-signal to limit the transmission of light associated with glare. An optical element (114, e.g. a liquid-crystal array) in communication with the computing device (118) selectively limits the transmission of light associated with glare to the observer in response to said control-signal.