Ophthalmic Laser Treatment Profile for Corneal Irregularity Ablation
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Solution Overview
Problem
Existing methods struggle to effectively treat geometric irregularities in the eye, such as elevations and depressions, which cause higher order aberrations and impair vision, and cannot be corrected by conventional means like spectacles or laser treatments.
Innovation Solution
A method using a control device to determine geometric irregularities from examination data, plan a treatment profile with an optimization function to minimize higher order aberrations while preserving corneal tissue, and provide control data for an ophthalmological laser to ablate these irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser treatment is used to correct geometric irregularities, then vision correction is attempted, but the treatment cannot effectively address higher order aberrations caused by elevations and depressions
Solution Approach 1:
The patent performs preliminary measurement and mapping of the corneal surface to identify geometric irregularities before treatment. The control device determines the position and extent of elevations and depressions, then plans the laser treatment pathway in advance to target these specific areas, ensuring effective correction of higher order aberrations
Solution Approach 2:
The patent replaces conventional mechanical/optical correction methods (spectacles, contact lenses) with direct laser ablation technology. The ophthalmological laser physically removes corneal tissue at the cellular level to correct geometric irregularities, providing a more precise and permanent solution than conventional optical correction
2Manufacturing precision
If laser treatment is applied to correct corneal irregularities, then vision improvement is achieved, but corneal tissue is removed which may compromise structural integrity
Solution Approach 1:
The patent applies laser treatment locally only to specific areas where geometric irregularities are detected. The control device determines precise treatment zones based on the position and extent of elevations and depressions, leaving the rest of the corneal tissue intact. This localized approach corrects aberrations while preserving overall corneal strength
Solution Approach 2:
The patent dynamically adjusts laser treatment parameters including pulse duration, energy level, and treatment depth based on real-time feedback and pre-treatment planning. The control device modifies these parameters to achieve precise tissue removal that corrects geometric irregularities while maintaining corneal structural integrity and avoiding excessive ablation
3Manufacturing precision
If extensive tissue removal is performed to correct geometric irregularities, then higher order aberrations are reduced, but the risk of corneal complications increases
Solution Approach 1:
The patent incorporates feedback mechanisms where the control device continuously monitors treatment progress and compares it against the pre-planned pathway. Based on this feedback, the system can adjust treatment parameters in real-time to stop ablation when the desired geometric correction is achieved, preventing excessive tissue removal and associated complications
Solution Approach 2:
The patent applies the principle of partial action by removing only the minimum necessary amount of tissue to correct the geometric irregularities. The control device calculates and executes treatment that is sufficient to address higher order aberrations without excessive ablation, thereby minimizing the risk of corneal complications while achieving the desired vision correction
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
Reduces vision impairing effects of geometric irregularities by minimizing tissue removal and correcting higher order aberrations, while allowing for additional correction through spectacle lenses if needed.
Implementation Method 1
pulsed lasers and a beam focusing device may for example be formed such that laser pulses effect a photodisruption and/or ablation in a focus situated within the organic tissue to remove a tissue, in particular a tissue lenticule, from the cornea
Implementation Method 2
laser pulses effect a photodisruption and/or ablation in a focus situated within the organic tissue to remove a tissue
Data Source
AI summary
The invention relates to devices and methods for providing control data for an ophthalmological laser (12) of a treatment apparatus (10) for reducing geometric irregularities (14) of an eye. As steps, the method includes determining geometric irregularities (14) of the eye from predetermined examination data, which generate higher order aberrations; determining a treatment profile with a preset optical zone depending on the geometric irregularities (14), wherein an optimization function, which includes a term for reducing the higher order aberrations and an opposing tissue removal term, is optimized up to an optimization range for determining the treatment profile; and providing the control data, which includes at least the treatment profile.