Ophthalmic Lens Laser Scanning With Synchronized Pulse Power Control
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Solution Overview
Problem
Existing methods for correcting optical aberrations, such as glasses, contact lenses, and laser eye surgery, face challenges in efficiently forming subsurface optical structures within ophthalmic lenses to address a large number of focal positions quickly and accurately, which is crucial for improving vision while minimizing patient discomfort and procedural time.
Innovation Solution
A system comprising a scanning-control device and a power-control device that coordinate the focusing of femtosecond laser pulse beams to specific focal positions within ophthalmic lenses, using separate controllers for scanning and power control to efficiently form subsurface optical structures, including diffractive or non-diffractive structures, by synchronizing trigger signals and adjusting pulse power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single controller is used to manage both scanning and power control of laser pulses, then device complexity is reduced, but processing time increases and productivity decreases
Solution Approach 1:
The control system is divided into two separate controllers: a scanning controller that manages the spatial positioning of laser pulses, and a power controller that manages the energy delivery. This segmentation allows each controller to specialize in one function, enabling parallel processing and significantly reducing overall processing time while maintaining system manageability
Solution Approach 2:
The patent transitions from a single-dimension control approach (one controller managing all parameters) to a multi-dimensional control architecture where scanning and power control operate in separate control dimensions. This allows simultaneous independent optimization of both scanning speed and power delivery, resolving the bottleneck that would exist in a unified controller
2Manufacturing precision
If a large number of laser pulses are delivered to achieve high precision subsurface structure formation, then manufacturing precision is improved, but treatment duration increases causing patient discomfort
Solution Approach 1:
The system pre-calculates and stores optimal power values for each scanning position before treatment begins. During the actual procedure, the pre-computed power map is rapidly retrieved and applied, eliminating the need for real-time calculations and enabling high-precision multi-pulse delivery within a shortened treatment window
Solution Approach 2:
The patent dynamically adjusts laser pulse parameters (power, duration, spacing) based on the specific subsurface structure being formed. By optimizing these parameters for each treatment location and using coordinated scanning-power control, the system achieves high precision with fewer pulses, thereby reducing overall treatment duration and patient discomfort
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 the rapid and precise formation of subsurface optical structures across a large number of focal positions, enhancing vision correction while reducing processing time and patient discomfort, thereby improving the efficiency and safety of the procedure.
Implementation Method 1
focusing femtosecond duration laser pulse beams to a targeted sequence of focal positions in the ophthalmic lens
Implementation Method 2
focusing a sequence of laser beam pulses to focal positions within the ophthalmic lens using a corresponding sequence of laser beam pulse power levels
Data Source
AI summary
Methods and systems for coordinating pulse powers and focal positions of laser beam pulses used to form a subsurface optical structure. Focal positions for a sequence of laser beam pulses may be stored in a scanning controller configured for controlling operation of a scanning assembly to scan the sequence of laser beam pulses to focal positions in the ophthalmic lens. A memory associated with a power controller may store pulse power data values corresponding to pulse powers for the sequence of laser beam pulses. The power controller can control a pulse power control assembly based on the pulse power data values. Operation of the scanning controller may be synchronized with operation of the power controller during scanning of the sequence of laser beam pulses to the focal positions in the ophthalmic lens via communication of one or more trigger signals between the scanning controller and the power controller.