Ophthalmological Laser Control Data for Corneal Aberration Reduction
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Solution Overview
Problem
Existing ophthalmological laser treatment methods for correcting corneal visual disorders often unintentionally induce spherical aberrations due to varying laser pulse efficiency across different treatment positions, particularly in the radial direction, leading to halos and reduced contrast sensitivity.
Innovation Solution
Adapting laser pulse efficiency by determining the local angle of the cornea and radiation angle at each treatment position, and adjusting irradiation parameters such as laser pulse energy or number of pulses to maintain constant efficiency, thereby compensating for the angle of incidence and minimizing spherical aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If laser pulses are radiated to different treatment positions on the cornea, then the treatment coverage is improved, but the laser pulse efficiency varies due to different angles of incidence
Solution Approach 1:
The patent applies local quality by adapting irradiation parameters specifically for different treatment positions on the cornea based on their local angles. The control device calculates and applies position-specific compensation values to maintain constant laser pulse efficiency across the entire treatment area, treating each location with customized parameters rather than uniform settings.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting irradiation parameters (such as laser pulse energy, number of pulses, or pulse repetition rate) according to the angle of incidence at each treatment position. This allows the system to compensate for efficiency variations caused by different radiation angles while maintaining consistent treatment results across the corneal surface.
2Manufacturing precision
If the laser pulse efficiency is kept constant across all treatment positions, then the treatment precision is improved, but additional calculations and adjustments are required for each position
Solution Approach 1:
The patent applies preliminary action by pre-calculating the angle of incidence and laser pulse efficiency for all treatment positions before the actual treatment begins. The control device stores these pre-computed values and retrieves them during treatment, avoiding real-time calculations and simplifying the control process while maintaining high precision.
Solution Approach 2:
The system implements self-service by automatically performing all necessary angle calculations and parameter adaptations without requiring manual intervention. The control device autonomously determines the corneal curvature, calculates radiation angles, computes efficiency values, and adjusts irradiation parameters for each treatment position, eliminating the need for complex manual setup or calibration.
3Ease of operation
If the angle of incidence is not compensated, then the treatment process is simpler, but spherical aberrations are induced leading to halos and reduced contrast sensitivity
Solution Approach 1:
The patent converts the harmful effect of angle-dependent efficiency variations into a beneficial outcome by using the calculated angle information to determine precise compensation values. The system transforms the potential source of aberrations into useful data that enables automatic parameter adaptation, ultimately improving treatment quality while maintaining operational simplicity.
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 ensures consistent laser pulse efficiency across treatment positions, reducing spherical aberrations and improving treatment outcomes by accounting for the angle of incidence and curvature changes during the procedure.
Implementation Method 1
laser beam pulses effect a photodisruption or ablation in a focus situated within the tissue of the cornea to separate a lenticule from the cornea
Implementation Method 2
laser beam pulses effect a photodisruption or ablation in a focus situated within the tissue of the cornea
Data Source
AI summary
The techniques presented herein relate to ascertaining a pretherapeutic curvature of the cornea, wherein a respective local angle of the cornea in predetermined treatment positions is ascertained; ascertaining a radiation angle at which a laser beam is radiated to the respective predetermined treatment positions of the cornea with respect to a reference axis of a beam deflection device of the treatment apparatus; and ascertaining a laser pulse efficiency for a particular treatment position of the ascertained predetermined treatment positions based on the ascertained local angle of the cornea in the particular treatment position and the radiation angle for the particular treatment position. The techniques further include adapting at least one irradiation parameter depending on the ascertained laser pulse efficiency for the particular treatment position; and providing the control data, which includes adapted irradiation parameters for the particular treatment position.