Ophthalmic Lens Ordering System for Power Alignment
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Solution Overview
Problem
The existing methods for ordering ophthalmic lenses often result in discrepancies between the prescribed power and the measured power on a lensmeter, leading to confusion and potential errors in correcting ametropia.
Innovation Solution
A method and system that determine the lens power to be measured on a lensmeter based on data representative of the desired correction and parameters defining the expected position of the lens with respect to the wearer's eye, ensuring the specified power is the same as the measured power, thereby avoiding confusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optician specifies the prescribed power as ordered to the manufacturer, then the lens is designed to provide the desired correction, but the measured power on the lensmeter generally differs from the prescribed power, leading to confusion
Solution Approach 1:
The patent applies preliminary action by calculating the expected lensmeter measurement in advance during the ordering phase. The ordering party's device computes what the lensmeter will measure based on the prescribed power, lens parameters, and mounting parameters, then communicates this expected measurement to the manufacturer. This allows both parties to reference the same value throughout the process, preventing confusion while maintaining accurate correction.
2Measurement precision
If the manufacturer indicates both prescribed power and expected lensmeter measurement, then the optician can verify the lens, but this may occasionally lead to confusion between the two power values
Solution Approach 1:
The patent extracts the expected lensmeter measurement as a separate, standalone parameter that replaces the need to communicate both prescribed power and expected measurement. By calculating and communicating only the expected measurement value that will actually be observed on the lensmeter, the system eliminates the confusion arising from having two different power values referenced, while still enabling verification.
3Reliability
If the lens power is determined based on lens position parameters and characteristics, then the measured power matches the ordered power, but this requires additional calculations and parameters
Solution Approach 1:
The patent introduces an intermediary computational device that performs the complex calculations of transforming prescribed power into expected lensmeter measurements. This device uses lens parameters and mounting parameters as inputs and outputs the expected measurement, acting as a mediator between the prescribing process and the manufacturing process. This hides the complexity from the users while ensuring accurate power specification.
Data Source
AI summary
A method of ordering an ophthalmic lens comprises the following steps: —obtaining data representative of a desired correction for a wearer's eye; —determining (S6, S8), using an electronic device, a lens power to be measured on a lensmeter based on the obtained data and on at least one parameter defining an expected position of the lens with respect to the wearer's eye, wherein the lens power corresponds to the power measured on the lensmeter for a lens adapted to provide the desired correction to the wearer's eye when placed at the expected position with respect to the wearer's eye; —ordering (S10) the ophthalmic lens specifying the determined power. A corresponding system is also provided.