Modular Intraocular Lens Positioning for Refractive Power
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Solution Overview
Problem
In cataract treatments, the position of an intraocular lens cannot be predicted exactly, leading to non-optimal refractive power selection and resulting imaging aberrations on the retina due to changes in the eye during the treatment process.
Innovation Solution
A treatment apparatus comprising a modular intraocular lens with a haptic and optic body, a measurement system, and a computing unit that determines the refractive power of the optic body based on precise measurements of the eye's properties, allowing for accurate selection and positioning of the lens to reduce imaging aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a measurement is carried out prior to the cataract treatment to determine the refractive power, then the intraocular lens can be selected in advance, but the position of the intraocular lens cannot be predicted exactly and the eye changes during treatment leading to non-optimal refractive power selection
Solution Approach 1:
The first part of the modular intraocular lens (including the haptic) is inserted into the capsular bag before the second part (optic body) is inserted. This preliminary action allows the measurement to be taken when the first part is already in position, enabling accurate determination of the optical path length and refractive power requirements before the final lens assembly is complete.
Solution Approach 2:
The intraocular lens is divided into two separate parts: a first part containing the haptic that is inserted first and spans the capsular bag, and a second part containing the optic body that is inserted afterward. This segmentation allows the measurement system to accurately assess the position and optical properties with the first part in place, resolving the contradiction between early selection and accurate measurement.
2Reliability
If the intraocular lens is inserted to replace the natural lens, then the cataract treatment is effective, but the eye shape changes and previous measurements no longer correspond to actual conditions
Solution Approach 1:
The measurement is performed after the first part of the modular intraocular lens is inserted into the capsular bag but before the second part (optic body) is inserted. This timing captures the eye's actual shape and optical properties in the post-treatment state, allowing accurate determination of the required refractive power for the optic body.
Solution Approach 2:
The measurement process is made dynamic by performing it at the optimal moment during the surgical procedure - after capsular bag stabilization with the first part in place, but before final lens assembly. This dynamic approach adapts the measurement timing to the actual surgical conditions rather than relying on static pre-treatment measurements.
3Measurement precision
If a modular intraocular lens with two parts is used, then accurate refractive power determination is possible, but the device complexity increases
Solution Approach 1:
The intraocular lens is segmented into two functional parts: a first part with haptic for capsular bag engagement and positioning, and a second part with optic body for refractive function. This segmentation enables the measurement system to accurately determine optical properties with the first part in place, while maintaining a relatively simple overall device structure.
Solution Approach 2:
The first part is inserted and positioned in advance to establish the optical geometry, allowing accurate measurement and determination of the second part's refractive power. This preliminary positioning simplifies the overall design by separating the positioning function (first part) from the refractive function (second part).
Data Source
AI summary
A treatment apparatus for a cataract treatment of an eye includes a modular intraocular lens including a first part, which includes a haptic configured to contact a capsular bag of the eye in a region of the equator of the capsular bag and thereby to span the capsular bag, and a second part, which includes an optic body, and has a convergence state, in which the second part contacts the first part, and a spaced-apart state, in which the second part is arranged spaced apart from the first part, a measurement system configured to determine, based on a first measurement, a position of the first part in the eye and in the spaced-apart state of the modular intraocular lens, and a controller configured to determine, based on the position of the first part, a refractive power of the optic body which is to be inserted into the eye.