Variable Focus Electroactive Ophthalmic Lens Design
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Solution Overview
Problem
Traditional ophthalmic lenses, such as contact and intraocular lenses, have static optical qualities that cannot be easily changed by the wearer, limiting their ability to accommodate varying focal powers, unlike spectacles which can be adjusted for different optical corrections.
Innovation Solution
A contact or intraocular lens with a variable optic portion that includes a front and back curve optical surface, a cavity with a dielectric film and electrodes, and fluid reservoirs connected via channels, allowing for the control of fluids and generation of an electric field to change the lens's optical properties, including focal power and light shading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional ophthalmic lenses are designed with static optical qualities, then manufacturing simplicity is maintained, but adaptability and versatility are limited
Solution Approach 1:
The patent applies the dynamics principle by transforming the static optical characteristics of traditional lenses into dynamic, adjustable properties. The lens incorporates an electroactive polymer layer that can change its refractive index and focal power in response to applied electrical voltage, enabling the lens to adapt between multiple optical states (e.g., distance and near vision) without requiring multiple separate lenses or complex mechanical adjustment mechanisms.
Solution Approach 2:
The patent utilizes parameter changes by modifying the electrical parameter (voltage) to control the optical parameters (focal power, refractive index) of the lens. By applying different voltage levels to the electroactive polymer layer, the lens can transition between different optical states, providing variable focus capabilities. This allows a single lens to replace multiple lenses with different fixed prescriptions.
2Adaptability or versatility
If multiple focal powers are incorporated into a single lens, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical adjustment systems (such as rotating lens elements or moving focus groups found in traditional变焦 lenses) with an electroactive polymer-based optical system. The electroactive polymer changes its optical properties through electrical stimulation rather than mechanical movement, eliminating the need for complex mechanical components while achieving multiple focal powers in a single, compact lens structure.
3Adaptability or versatility
If electroactive materials are used to enable variable focus, then optical adjustability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies the nesting principle by integrating the electroactive polymer layer within the lens structure, embedding it between the lens surfaces and encapsulating it with encapsulation layers. This nested configuration protects the electroactive material and maintains its optical functionality while simplifying the overall manufacturing process, as the electroactive layer can be applied as a thin coating or inserted membrane rather than requiring precision fabrication of the entire lens with variable optical properties.
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
Enables the wearer to dynamically adjust the optical characteristics of the lens, providing multiple focal powers and light shading effects without the need for physical changes, enhancing versatility and functionality.
Implementation Method 1
A cavity is formed that can include a dielectric film and one or more electrode(s) capable of withstanding or establishing an electric field
Data Source
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AI summary
A variable focus ophthalmic device is described. The device comprises a front curve optical portion of the variable focus ophthalmic device comprising a front curve top optical surface and a front curve bottom optical surface and a back curve optical portion of the variable focus ophthalmic device comprising a back curve top optical surface and a back curve bottom optical surface. A cavity is formed by the front curve bottom optical surface of the front curve optical portion of the variable focus ophthalmic device and the back curve top optical surface of the back curve portion of the variable focus ophthalmic device. A first fluid with a first index of refraction and a second fluid with a second index of refraction is provided, wherein the first index of refraction and the second index of refraction are different and the two fluids are immiscible. A dielectric film in contact with at least a portion of one or more of the first or second fluids and overlying an electrode capable of establishing an electric field is provided. One or more reservoir regions for containment of a volume of fluid equal or approximately equal to the volume of the first fluid and wherein the reservoir is in fluid connection with said formed cavity.