Intraocular Lens Edge Angle and Vault Height for Capsular Bend Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Posterior capsule opacification (PCO) and negative dysphotopsia (ND) remain significant issues in cataract surgery, with current IOL designs failing to effectively prevent these conditions, particularly due to inadequate edge angles and optical zone sizes, leading to reduced visual quality and potential need for secondary interventions.
Innovation Solution
Intraocular lenses (IOLs) with a sharper edge design, enlarged optical zone, and increased vault height are developed, featuring an angle less than 90 degrees between the edge and posterior surface, and an attenuation optical zone that gradually reduces optical power, minimizing light deviation and increasing pressure on the capsular bend.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IOL edge angle is increased to 90-110 degrees to prevent PCO, then PCO prevention is improved, but negative dysphotopsia occurs due to light missing the IOL at higher angles
Solution Approach 1:
The patent changes the edge angle parameter from the conventional 90-110 degrees to a sharper angle of approximately 45-60 degrees. This parameter change simultaneously improves PCO prevention by creating sharper capsular bend and reduces negative dysphotopsia by allowing light to pass through at higher angles without missing the IOL
Solution Approach 2:
The patent combines multiple design features into a composite IOL structure: sharper edge angle (45-60 degrees), increased optical zone diameter (6.0-8.0 mm), and increased vault height (0.35-1.5 mm). This composite design achieves both PCO prevention and ND reduction that cannot be accomplished with single-parameter changes
2Object-affected harmful factors
If the optical zone diameter is increased to reduce negative dysphotopsia, then light refraction is improved, but the IOL size and complexity increase
Solution Approach 1:
The patent increases the optical zone diameter parameter to 6.0-8.0 mm, which is larger than conventional IOLs. This parameter change reduces negative dysphotopsia by providing a larger optical surface for light refraction while the sharper edge angle compensates for the increased size
3Reliability
If the vault height is increased to enhance capsular bend pressure and reduce PCO, then PCO prevention is improved, but the IOL complexity and manufacturing difficulty increase
Solution Approach 1:
The patent increases the vault height parameter to 0.35-1.5 mm, creating greater distance between the IOL and posterior capsule. This parameter change enhances capsular bend pressure and improves PCO prevention while the sharper edge angle design simplifies the overall structure
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
These designs significantly reduce the risk of PCO and ND by enhancing capsular bend pressure and optimizing light refraction, thereby improving visual quality and reducing the need for secondary interventions.
Implementation Method 1
the light passing the IOL at the lower angles of incidence is refracted, changing its direction to a lower angle
Implementation Method 2
An example ophthalmic lens can include an optic including an anterior surface defining an anterior side of the optic, a posterior surface defining a posterior side of the optic, and an edge arranged between the anterior and posterior surfaces. The edge and the posterior surface can form an angle, where the angle is less than about 90 degrees. Additionally, the ophthalmic lens can have an increased vault height. At least one of the angle or the increased vault height can be configured to increase pressure on a capsular bend in a subject's eye.
Data Source
AI summary
Intraocular lenses for reducing the risk of posterior capsule opacification (PCO) are described herein. PCO can be reduced with an IOL design that increases the pressure at the posterior capsular bend, for example, by including a sharper edge design, an enlarged optical zone, and/or an increased vault height. An example ophthalmic lens can include an optic (200) including an anterior surface (202) defining an anterior side of the optic, a posterior surface (204) defining a posterior side of the optic, and an edge (210) arranged between the anterior and posterior surfaces. The edge and the posterior surface can form an angle, where the angle is less than about 90 degrees. Additionally, the ophthalmic lens can have an increased vault height. At least one of the angle or the increased vault height be configured to increase pressure on a capsular bend in a subject's eye.