Eyeglass Sensor Unit for Natural Head Posture Lens Measurement
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Solution Overview
Problem
Existing systems for fitting prescription eyewear fail to accurately account for changes in head posture and line of sight, leading to suboptimal lens fabrication and image clarity due to measurements taken in unnatural positions.
Innovation Solution
A system and method that uses a sensor unit attached to eyeglass frames to collect data on changes in orientation during situational simulations, such as walking or reading, to determine accurate measurements for lens fabrication, considering both facial anatomy and head posture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If measurements are taken while the optician stands next to the person, then data collection is efficient, but the person assumes an unnatural posture leading to false normals and suboptimal lens fabrication
Solution Approach 1:
The patent replaces the mechanical measurement system (optician standing next to patient with physical measurement devices) with an optical/image-based system. Digital images are captured and processed to determine pupil centers and facial features, allowing measurements to be taken without the optician physically positioning themselves in a way that forces the patient into unnatural postures. The system uses image analysis algorithms to automatically locate anatomical landmarks and calculate measurements from photographs taken in natural viewing conditions.
2Ease of manufacture
If the optician marks pupil centers on lenses while the person is erect and facing forward, then the marking process is simple, but the lenses are off-center when worn in natural head positions causing suboptimal image clarity
Solution Approach 1:
The system performs preliminary analysis of the patient's natural head posture and line of sight before lens fabrication begins. By capturing images and analyzing facial anatomy and head orientation in advance, the system determines the true optical centers that account for the patient's natural viewing position. This preliminary data is then used to guide lens fabrication and marking, ensuring that lenses are centered correctly for the patient's actual wearing conditions rather than assuming an artificial erect posture.
Solution Approach 2:
The system changes the reference parameters used for lens centering from standard anatomical landmarks (which assume erect posture) to dynamically calculated parameters that account for the patient's natural head tilt and orientation. By measuring and incorporating the actual head position angles and facial feature locations into the lens fabrication parameters, the system adjusts the optical centers to match the patient's true line of sight when wearing glasses in natural positions.
Data Source
AI summary
A system and method for determining the measurements needed to fabricate prescription eyeglasses. The system and method take into account how the frames fit naturally on the head and how the person's posture orients the head and alters the line of sight through the lens of the eyeglasses. A sensor unit is provided that is attached to the eyeglass frames. The individual then wears the eyeglass frames and moves through at least one situational simulation. The sensor unit generates data that corresponds to changes in orientation. The data is used to determine how a person's line of sight is altered by the anatomy of the face and the posture of the head.