Intraocular Lens Edge Attenuation for Negative Dysphotopsia
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Solution Overview
Problem
Current intraocular lenses (IOLs) fail to address negative dysphotopsia (ND) and posterior capsule opacification (PCO), with ND caused by light missing the IOL at higher angles creating shadows on the retina and PCO resulting from lens fiber migration, despite existing designs that partially alleviate these issues.
Innovation Solution
Intraocular lenses with an attenuation optical zone that gradually reduces optical power to zero at the edge, combined with a sharper edge design and increased vault height, to minimize light deviation and enhance capsular pressure, thereby reducing ND and PCO.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional intraocular lens with uniform optical power is used, then the lens provides clear distance vision, but it causes negative dysphotopsia (dark scotoma) in the peripheral visual field
Solution Approach 1:
The intraocular lens applies local quality by creating an attenuation optical zone with gradually reduced optical power in the peripheral regions while maintaining full optical power in the central optical zone. This localized variation in optical properties allows clear distance vision through the central zone while reducing negative dysphotopsia through the attenuated peripheral zone, directly resolving the technical contradiction between visual acuity and harmful peripheral effects.
2Object-affected harmful factors
If the optical power is reduced in the peripheral zone to reduce negative dysphotopsia, then peripheral visual comfort improves, but optical quality may deteriorate
Solution Approach 1:
The lens employs dynamics through its gradual transition of optical power from the central to peripheral zones. The continuous gradient in the attenuation optical zone creates a smooth optical transition that prevents abrupt changes in light refraction, thereby maintaining optical quality while reducing negative dysphotopsia. This dynamic optical power distribution resolves the contradiction between peripheral comfort and overall optical quality.
3Object-affected harmful factors
If an attenuation optical zone is added to the lens, then negative dysphotopsia is reduced, but device complexity increases
Solution Approach 1:
The invention merges the central optical zone and attenuation optical zone into a single integrated intraocular lens structure with a continuous optical power gradient. By combining these zones into one monolithic lens rather than separate components, the design reduces device complexity while still achieving the dual benefit of clear central vision and reduced peripheral dysphotopsia through the gradual optical power transition.
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 design effectively minimizes light deviation at the edge of the IOL, eliminating ND and reducing the risk of PCO by ensuring smooth optical power transition and increased capsular pressure.
Implementation Method 1
optical power of the ophthalmic lens is gradually reduced within the attenuation optical zone
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
Intraocular lenses for reducing Negative dysphotopsia (ND) are described herein. An example ophthalmic lens can include an optic with a central optical zone disposed about the optical axis and an attenuation optical zone disposed about the central optical zone, wherein the attenuation optical zone is contiguous with the central optical zone, and wherein optical power of the ophthalmic lens is gradually reduced within the attenuation optical zone.