Multifocal Intraocular Lens with Segmented Optical Surfaces
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Solution Overview
Problem
Conventional intraocular lenses, particularly multifocal lenses, suffer from issues such as glare, halo, and uneven light distribution, leading to poor imaging quality and the need for additional corrective measures like glasses for varying vision distances.
Innovation Solution
An intraocular lens design featuring an optical portion with a first surface and a second surface, each comprising central and annular areas with different focal powers, allowing light to be refracted and converged to multiple positions on the optical axis, providing at least three focuses without the need for multiple uneven annular structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional refractive multifocal intraocular lens is used, then multiple focal powers are provided, but uneven refractive rings cause glare and halo and require high precision on central position
Solution Approach 1:
The optical portion is divided into multiple annular areas with different focal powers, where each annular area corresponds to a specific focal length (e.g., first annular area for distant vision, second annular area for intermediate vision, third annular area for close vision). This segmentation allows light to be refracted to multiple focal points simultaneously without creating uneven refractive rings, thereby providing multiple focal powers while eliminating glare and halo effects.
2Adaptability or versatility
If diffractive multifocal intraocular lens is used, then multiple focal powers are achieved, but imaging quality is poor and light energy loss is large
Solution Approach 1:
Each annular area on the optical portion is designed with specific local optical properties (different focal powers) tailored to the vision requirement. The first annular area has a first focal power for distant objects, the second annular area has a second focal power for intermediate objects, and the third annular area has a third focal power for close objects. This local quality differentiation allows efficient light distribution to multiple focal points without the large light energy loss associated with diffractive structures.
3Adaptability or versatility
If conventional refractive multifocal intraocular lens is used, then multiple focal powers are provided, but high precision on central position is required and slight deviation causes vertigo
Solution Approach 1:
Instead of relying on precise central positioning in one dimension, the invention distributes focal powers across multiple annular areas in the radial dimension. The first, second, and third annular areas are arranged concentrically with different radii, allowing light from objects at different distances to be refracted to the corresponding focal points. This dimensional arrangement makes the system more tolerant to central position deviations while maintaining multiple focal powers.
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 design enhances vision clarity by reducing glare and halo, maintaining low light energy loss, and enabling clear vision at different distances without the need for additional corrective measures.
Implementation Method 1
light enters into the optical portion from the first surface, and is refracted from the second surface, and converged to at least three different positions on an optical axis of the optical portion
Data Source
AI summary
Disclosed is an intraocular lens, including an optical portion. A first surface of the optical portion includes a first central area and a first annular area, which have different focal powers; a second surface of the optical portion includes a second central area and a second annular area, which have different focal powers, and the first central area and the second central area are not completely projected onto each other. Based on the ability of the areas on the first surface and the areas on the second surface of the optical portion to refract the light, the light enters into the optical portion from the first surface, and is refracted from the second surface of the optical portion, and converged to at least three different positions on the optical axis of the optical portion.