Variable Focus Intraocular Lens with Angled Haptics
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Solution Overview
Problem
Current intraocular lenses, especially multifocal and accommodating lenses, often result in reduced contrast sensitivity and glare issues, particularly in dim lighting conditions, and require additional corrective measures for seamless vision across distances, with traditional haptics frequently decentering and dislocating within the eye.
Innovation Solution
A single focus intraocular lens design featuring an optic coupled to haptics at a flexion setting a non-zero angle, allowing seamless vision from distance to near without glare or halos, with flexible and rigid plate haptics that center and fixate the lens within the capsular bag, mimicking the orientation of external bifocals for efficient light focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multifocal lenses are used to provide vision at multiple distances, then near vision is improved, but contrast sensitivity is reduced and glare/halos occur in dim lighting
Solution Approach 1:
The lens utilizes the dynamic accommodation mechanism of the eye, where the ciliary muscle contraction and relaxation naturally move the lens optic forward and backward along the optical axis. This dynamic movement allows a single lens to provide clear vision at multiple distances without the static multiple focal points that cause glare and halos in multifocal lenses.
Solution Approach 2:
The invention extracts and eliminates the problematic multifocal design that creates simultaneous multiple images on the retina. By using a single focus accommodating lens instead of multifocal lenses, the harmful glare and halo effects are removed while retaining the ability to achieve vision at multiple distances through natural lens movement.
2Reliability
If traditional haptics are used to center and fixate the lens, then lens positioning is improved, but decentering and dislocation still occur
Solution Approach 1:
The invention uses flexible plate haptics made from silicone that can flex and adapt to the capsular bag geometry. These thin, flexible plates with integrated loops or fingers provide reliable centering and fixation by conforming to the eye's anatomy, preventing decentering and dislocation while maintaining stable lens positioning.
3Adaptability or versatility
If the optic moves forward and backward for accommodation, then seamless vision at all distances is achieved, but weak reading glasses are still needed for prolonged reading in dim lighting
Solution Approach 1:
The invention optimizes the optical parameters of the lens, including the refractive index and curvature design, to enhance near vision capability. By carefully designing the optic's optical properties and combining it with flexible plate haptics that ensure proper positioning, the lens provides improved near vision that reduces the need for additional corrective measures during prolonged reading in dim lighting conditions.
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 lens provides consistent, uncorrected distance vision and seamless focus from far to near without the need for additional corrective measures, reducing glare and halos, and maintaining optical integrity through precise centering and fixation within the eye.
Implementation Method 1
The optic of these lenses moves forward and backward upon constriction and relaxation of the ciliary muscle
Implementation Method 2
focuses light on the retina at either two or three focal lengths
Implementation Method 3
These flexible fingers extend beyond the distal or outer end of the plate haptics and slightly beyond the diameter of the capsular bag and are designed to flex centrally to center and fixate the lens
Data Source
AI summary
A variable focus intraocular lens comprises an optic coupled to at least one haptic at a flexion that sets a non-zero angle between the optic and the haptic.