Intraocular Lens Mark for Accurate Fixation
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Solution Overview
Problem
Conventional intraocular lenses with visible marks for astigmatic axis alignment can obstruct the field of view and only provide orientation information, making accurate fixation challenging, especially when additional information like center position and tilt is required for precise positioning.
Innovation Solution
Incorporating a detectable mark on the intraocular lens using a geometric pattern that is visible under specific wavelengths outside the visible light range, allowing for identification of the optical center position and posture information, and utilizing an intraocular lens fixing assistance system with illumination, image pickup, and image processing to display this information for accurate alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a visible mark is provided on the optical part of the intraocular lens, then the orientation of the lens can be grasped, but the mark obstructs the field of view of the wearer
Solution Approach 1:
The mark is segmented into multiple geometric patterns (e.g., multiple dots or lines) arranged in specific configurations, allowing different portions of the mark to serve different functions (orientation indication, center position identification) while distributing the visual impact across multiple discrete elements rather than a single large mark
Solution Approach 2:
The mark uses geometric patterns with spatial arrangements in two dimensions (patterns of dots, lines, or shapes positioned at specific locations), enabling multiple types of information (orientation, center position, tilt) to be encoded in the spatial configuration rather than requiring large visible areas
2Measurement precision
If a mark is applied at the optical center position of the optical part, then the intraocular lens can be fixed more easily and accurately, but the mark may still obstruct the field of view
Solution Approach 1:
The mark is designed with local quality variations where specific geometric patterns (such as a dot at the center or lines radiating from the center) provide precise center position information, while the overall mark structure minimizes visual obstruction by using minimal material and strategic positioning
Solution Approach 2:
The mark uses geometric patterns that can be easily detected and copied by imaging systems (such as infrared cameras or specialized imaging devices), allowing the mark information to be transferred to a display or processing system rather than requiring the mark itself to be large and visible to the wearer
3Loss of information
If a conventional mark is used on the intraocular lens, then only the orientation of the lens can be indicated, but additional information such as center position and tilt cannot be obtained
Solution Approach 1:
The geometric pattern mark is designed to be multi-functional, serving multiple purposes simultaneously: indicating orientation (through pattern orientation), identifying center position (through pattern symmetry or specific geometric features), and providing tilt information (through asymmetric arrangements or reference to the lens surface). This single mark structure replaces what would otherwise require multiple separate marks or indicators
Solution Approach 2:
The mark encodes multiple types of information by utilizing the two-dimensional spatial arrangement of geometric patterns. Different aspects of lens positioning (orientation, center position, tilt) are represented by different spatial relationships within the same planar pattern, effectively using the 2D plane to convey 3D positioning information
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
Enables more accurate fixation of the intraocular lens by providing clear optical center and posture information, improving the precision of refractive correction and reducing visual obstruction during the fixation process.
Implementation Method 1
an optical part (110) having a mark (130) that is detectable under illumination of a specific wavelength range outside a wavelength range of visible light
Data Source
AI summary
To provide an intraocular lens to which a mark for assisting more accurate fixation in an eye has been applied. Provided is an intraocular lens including an optical part having a mark that is detectable under illumination of a specific wavelength range outside a wavelength range of visible light, and a support part that supports the optical part, in which the mark is indicated by a geometric pattern that allows for identification of an optical center position of the optical part and information regarding posture of the optical part in an eye.