Eye Measurement Trajectory Rotation Homogeneity
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Solution Overview
Problem
Existing interferometric methods for capturing measurement points on the eye take a long time, leading to inaccurate results due to eye movements, as they fail to achieve a short overall measurement duration with high resolution and homogeneous coverage.
Innovation Solution
The method involves rotating and/or displacing the trajectory of the measurement beam between iterations to achieve a more homogeneous measurement point distribution, using techniques like spectral domain OCT or swept source OCT, and employing telecentric optical units to correct for refractive effects, ensuring continuous and efficient data capture without interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dense scanning pattern with many measurement points is used, then measurement precision and coverage are improved, but measurement duration increases leading to eye movement artifacts
Solution Approach 1:
The measurement process is divided into multiple iterations, where each iteration captures a subset of measurement points along a trajectory. The trajectory is rotated between iterations to progressively fill in coverage gaps, allowing the system to achieve high overall coverage through segmented sequential measurements rather than a single dense scan
Solution Approach 2:
The measurement system employs periodic scanning along trajectories that are rotated by a specific angle between iterations. This periodic action with rotational progression enables efficient data collection by systematically covering different angular sectors of the measurement region across multiple passes
2Reliability
If the measurement duration is shortened to reduce eye movement artifacts, then measurement reliability is improved, but coverage and resolution may be compromised
Solution Approach 1:
The system adds a rotational dimension to the scanning process by rotating the trajectory between iterations. This dimensional addition allows the measurement beam to cover a broader angular range and achieve more uniform spatial distribution of measurement points across the measurement region, thereby improving coverage without requiring longer measurement times
Solution Approach 2:
The system performs preliminary measurements along a trajectory to capture initial data, then uses that information to plan and execute subsequent trajectories with optimized rotation angles. This preliminary action enables adaptive adjustment of scanning patterns to achieve complete coverage while minimizing total measurement duration
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 allows for precise and efficient measurement of the eye by minimizing movement artifacts and achieving a high degree of coverage, resulting in more accurate and reliable measurement data with reduced measurement time.
Implementation Method 1
an interferometer is used to carry out such examinations of the eye... capture stray-light profiles (axial profiles) of the eye along the optical beam
Implementation Method 2
OCT (optical coherence tomography) scanners are used as interferometers; these scan the eye at discrete positions in the lateral direction
Data Source
AI summary
In a method for interferometrically capturing measurement points of a region of an eye, a plurality of measurement points are captured by a measurement beam along a trajectory, wherein the same trajectory is passed over by the measurement beam in the region during at least a first iteration and a second iteration. The trajectory of the first iteration is rotated through an angle and/or displaced by a distance in relation to the trajectory of the second iteration in order to obtain a more homogeneous measurement point distribution.