Biased Accommodating Intraocular Lens with Plate Haptic
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Solution Overview
Problem
Current intraocular lenses, particularly accommodating and multifocal types, often require additional corrective measures for near vision, especially in dim lighting conditions, and struggle with maintaining consistent positioning within the eye, leading to issues like glare and halos, especially at night.
Innovation Solution
A single focus accommodating intraocular lens design featuring a biased optic coupled with a plate haptic, which responds to vitreous pressure changes, allowing for improved movement and accommodation between far and near vision without the need for additional corrective lenses, utilizing flexible materials and structures to enhance focusing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multifocal lenses are used to provide multiple focal lengths, then near vision is improved, but contrast sensitivity is reduced and glare/halos occur in dim lighting
Solution Approach 1:
The patent employs a dynamic accommodating lens system where the optic moves forward and backward along the optical axis in response to ciliary muscle constriction and relaxation. This dynamic movement allows a single optic to provide multiple focal points (distance, intermediate, and near vision) without the static multiple focal points of multifocal lenses, thereby maintaining contrast sensitivity while eliminating glare and halos in dim lighting conditions.
Solution Approach 2:
The patent changes the position parameter of the optic along the optical axis to achieve different focal lengths. By varying the optic's position (anterior for near vision, posterior for distance vision), the system provides multiple focal points without dividing light intensity, thus avoiding the contrast sensitivity reduction and glare issues associated with multifocal lenses.
2Measurement precision
If accommodating lenses move the optic forward and backward for near vision, then reading vision is improved, but weak reading glasses are still necessary in dim lighting conditions
Solution Approach 1:
The patent employs a dynamic accommodating lens system where the optic moves forward and backward along the optical axis in response to ciliary muscle constriction and relaxation. This dynamic movement allows a single optic to provide multiple focal points (distance, intermediate, and near vision) without the static multiple focal points of multifocal lenses, thereby maintaining contrast sensitivity while eliminating glare and halos in dim lighting conditions.
Solution Approach 2:
The accommodating optic is designed to perform multiple functions across different viewing distances. By providing distance, intermediate, and near vision through a single dynamic optic, the lens eliminates the need for additional corrective lenses or glasses, offering universal vision correction for all distances including reading in dim lighting conditions.
3Reliability
If traditional haptics are used to center and fixate the lens, then lens positioning is improved, but the lens may still de-center and dislocate
Solution Approach 1:
The haptic system is segmented into multiple independent haptics (typically three or more) that are distributed around the optic. This segmentation allows each haptic to independently engage with the capsular bag and provide centering forces, creating a more stable and redundant positioning system that prevents de-centering and dislocation better than traditional single or dual haptic designs.
Solution Approach 2:
The haptics are designed with specific local geometries and flexibilities optimized for their positioning function. Each haptic has tailored dimensions, curvature, and material properties that enable it to engage effectively with the capsular bag at specific locations, providing optimal centering and fixation forces to maintain reliable lens positioning and prevent de-centering.
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
The solution provides seamless vision from distance to near automatically, improving near vision acuity and reducing the need for reading glasses, while maintaining stable positioning within the eye, thus addressing the limitations of existing lens designs.
Implementation Method 1
Near vision results from a forward movement of the optic upon constriction of the ciliary muscle which increases the pressure in the posterior part of the eye with a simultaneous decrease in pressure in the anterior part of the eye.
Implementation Method 2
The accommodating intraocular lens may have an optic coupled to a plate haptic via a member that substantially promotes the optic's response to a vitreous pressure change.
Data Source
AI summary
An accommodating intraocular lens has a lens optic that is coupled to at least one haptic and is anteriorly biased with respect thereto.