Prismatic Lens Centration Marking for Binocular Vision
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Solution Overview
Problem
The centration of spectacle lenses with prismatic power is prone to errors, is time-intensive, and imprecise, particularly for progressive lenses, which is critical for undisturbed binocular vision, as opticians struggle to accurately position the prismatic power reference point relative to the ocular center and ensure proper alignment with the main ray path.
Innovation Solution
A method that involves obtaining individual user data, including prismatic prescription data, to design and specify centration data for the position of a fitting point on the spectacle lens, allowing for precise centration by determining the position of a fitting point based on prismatic prescription data, and applying centration markings on the lens to guide correct alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual centration procedures are used for spectacle lenses with prismatic power, then the optician can adjust the lens position, but the process is time-intensive and imprecise
Solution Approach 1:
The patent applies preliminary action by pre-calculating and marking the correct centration position on the lens before the fitting process. The system determines the precise position of the prismatic power reference point relative to the optical center and marks this position on the lens, allowing the optician to simply align the marked position with the patient's pupillary distance without performing complex manual adjustments during the fitting.
2Reliability
If manual adjustment of prismatic reference point position is performed, then the optician can position the lens, but errors occur due to complexity of calculation and measurement
Solution Approach 1:
The patent replaces the mechanical manual measurement and calculation system with an automated optical measurement and calculation system. The system uses optical instruments to precisely measure the patient's pupillary distance and eye geometry, automatically calculates the correct centration position accounting for prismatic power effects, and marks the position on the lens, eliminating manual measurement errors and complex calculations.
Solution Approach 2:
The patent introduces an intermediary system consisting of optical measurement devices and computer software that mediate between the optician and the lens marking process. This intermediary system automatically handles the complex calculations and measurements, serving as a bridge that translates patient anatomical data into precise lens centration positions without requiring the optician to perform complex manual adjustments.
3Manufacturing precision
If thorough manual centration is performed for progressive lenses, then binocular vision can be maintained, but the process remains approximate and error-prone
Solution Approach 1:
The patent applies self-service by enabling the lens system to self-indicate its correct centration position through permanent markings. The marked position on the lens serves as a self-referencing feature that automatically guides proper alignment during fitting, eliminating the need for continuous manual adjustment and allowing the optician to simply align the marked position with the patient's anatomical features.
Data Source
AI summary
The invention relates to a method, a system and a computer program product, in particular for designing or producing a lens having a prismatic effect, and to a lens having a prismatic effect. Said method consists of the following steps: individual data of the spectacle wearer is obtained, said individual user data comprising prismatic prescription data; the prismatic lens is designed taking into account the individual user data; centration data for the prismatic lens is determined in accordance with the prismatic prescription data.