Ophthalmic Device Active Eye Movement Correction
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Solution Overview
Problem
Existing ophthalmic devices face misalignment issues during eye scanning due to patient movement, leading to artefacts and errors in three-dimensional reconstruction of the anterior chamber, with current solutions either increasing workload and computational costs or being structurally and operationally complex.
Innovation Solution
An active correction system that uses a first light projection system to illuminate a cross-section of the eye, a second light projection system to create a fixation point, and a mobile optical member with detection and control means to maintain alignment by displacing the illumination beam based on eye movement detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a posteriori correction methods are used to compensate for eye misalignment during scanning, then alignment errors can be reduced, but the examination workload increases and computational costs rise
Solution Approach 1:
The patent applies preliminary action by detecting eye position at multiple predetermined locations along the scanning path before the actual scanning occurs. This allows the system to pre-determine correction values for each position, so that when scanning takes place, the corrections are already prepared and can be applied without increasing real-time computational burden or examination workload.
2Measurement precision
If active correction systems with multiple recording channels are implemented to detect and correct eye misalignment, then alignment accuracy improves, but the structural and operational complexity increases
Solution Approach 1:
The patent employs a single optical axis that serves multiple functions: it is used for both illuminating the cornea and for detecting eye position through the position detection device. This multi-functional approach eliminates the need for separate recording channels while maintaining the capability to detect and correct misalignment, thereby reducing structural complexity while preserving measurement precision.
3Productivity
If scanning is performed quickly to minimize eye movement during examination, then productivity increases, but alignment errors worsen due to incomplete scanning or reduced image quality
Solution Approach 1:
The patent implements feedback by continuously monitoring eye position at multiple predetermined positions along the scanning path and using this information to dynamically adjust the illumination beam position. This real-time feedback mechanism allows the system to maintain accurate alignment even during faster scanning, as the corrections are applied based on actual eye position rather than relying solely on slow mechanical stabilization.
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 approach simplifies the examination process, reduces costs, and enhances the accuracy of results by actively correcting eye misalignment during scanning, ensuring precise alignment of the illumination beam with the corneal vertex.
Implementation Method 1
a first light projection system adapted to illuminate a cross-section of the anterior chamber under examination with an illumination light beam
Implementation Method 2
a second light projection system adapted to generate a fixation light beam determining a fixation point for the eye of the patient
Implementation Method 3
a mobile optical member adapted to interfere at least with said illumination beam and, with its motion, to displace the beam
Implementation Method 4
sensor means adapted to detect a movement of the eye with respect to said correct positioning
Data Source
AI summary
An ophthalmic device and method actively correcting possible movement of the eye of a patient with respect to the correct positioning during the examination are described. An illumination light beam is provided, that passes through a cross-section of the anterior chamber of the eye to capture an image on the corneal vertex.