Optical Verification Device for Eyeglass Lens Measurements
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Solution Overview
Problem
Current methods for measuring monocular pupillary distance and segment height for eyeglass lenses are often imprecise, leading to unsuitable lenses being created, resulting in additional costs and patient dissatisfaction.
Innovation Solution
A device with a removable support frame and movable markers that accurately position demo lenses to mark the correct pupillary distances and segment heights, allowing for precise verification of measurements before lens creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a centration chart is used to check measurements, then the process is simple and quick, but the measurement precision is very rough and imprecise
Solution Approach 1:
The patent replaces the mechanical/visual inspection method (centration chart) with an optical system using a light source, optical axis alignment, and visual verification through the lens. This allows precise measurement verification while maintaining operational simplicity, resolving the contradiction between ease of operation and measurement precision.
2Productivity
If no double checking is done on measurements, then the process is fast and efficient, but the reliability of lens creation is compromised
Solution Approach 1:
The patent performs measurement verification before lens creation by positioning a light source at the measured monocular pupillary distance and segment height, then checking if the light aligns with the optical axis of the demo lens. This preliminary verification ensures measurement reliability without significantly impacting productivity, as the check is integrated into the existing workflow.
3Loss of time
If imprecise measurements are taken, then the initial measurement process is quick and easy, but additional costs and remakes are incurred
Solution Approach 1:
The patent provides immediate visual feedback by allowing the practitioner to observe whether the light source aligns with the optical axis of the demo lens. If misaligned, the measurements can be adjusted and reverified immediately. This feedback mechanism ensures manufacturing precision while minimizing time loss, as corrections are made during the verification step rather than after lens creation.
Data Source
AI summary
Improved optical measuring devices and methods are disclosed for checking certain measurements taken of a patient's face before these measurements are used to create eyeglass lenses for the patient. Embodiments of the invention include a receptacle or bracket for receiving an eyeglass frame having demonstration lenses mounted therein. The frame is held in place, and one or more mechanical structures are provided below the frame which support one or more movable markers, typically one for each lens. The structures are moved according to the measurements taken of the patient's face. A stamping or marking mechanism is provided on each structure which is used to mark the pupil location on each respective lens after the structures are moved according to the patient measurements. The marked lenses are then taken to the patient for verification and modification of measurements, if necessary. Once the measurements have been verified, final lenses may be created.