Ocular Refraction Measurement with Tilted Optical Axis
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Solution Overview
Problem
Current devices for measuring ocular refraction are limited by the need for constrained head postures and viewing angles, failing to accurately capture refraction parameters for natural binocular vision and varying visual behaviors, and often require multiple devices and complex procedures, leading to inefficiency and inaccuracy.
Innovation Solution
A device with a variable proximity sighting optical system and infrared illumination, capable of capturing ocular refraction images in different postures and viewing distances without external constraints, allowing for simultaneous measurement of ocular refraction and mounting parameters using a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an autorefractometer is used to measure refraction, then measurement precision is improved, but device complexity increases and it requires constrained head posture
Solution Approach 1:
The patent combines refraction measurement and mounting parameter measurement into a single integrated device. The autorefractometer is merged with imaging means and mounting parameter measurement capabilities, allowing both types of measurements to be performed simultaneously with one device rather than requiring separate devices and multiple measurement sessions.
Solution Approach 2:
The measuring device is designed with multi-functionality to perform refraction measurement, mounting parameter measurement, and imaging functions all in one apparatus. This universal device can measure various parameters including refraction, pupillary distance, half-deviations, height, pantoscopic angle, lens-to-eye distance, and center position rotation, eliminating the need for multiple specialized devices.
2Measurement precision
If an autorefractometer with chin rest is used, then measurement precision is improved, but ease of operation deteriorates due to head posture constraints
Solution Approach 1:
The patent removes the chin rest constraint from the measurement system. By extracting the head support constraint, the device allows free head carriage while maintaining measurement precision through the use of imaging means that can capture ocular refraction images without requiring the subject to maintain a fixed head position.
Solution Approach 2:
The device transitions from a static measurement system requiring fixed head posture to a dynamic system that can accommodate varying head positions and angles. The imaging means and optical system are designed to adapt to different head carriages, allowing measurements in natural viewing positions for both distance and near vision.
3Measurement precision
If separate devices are used for refraction measurement and mounting parameter measurement, then measurement precision for each parameter is improved, but productivity deteriorates due to multiple measurement steps
Solution Approach 1:
The patent merges refraction measurement and mounting parameter measurement into a single integrated device. The autorefractometer is merged with imaging means and mounting parameter measurement capabilities, allowing both types of measurements to be performed simultaneously with one device rather than requiring separate devices and multiple measurement sessions.
Solution Approach 2:
The device enables continuous measurement of both refraction and mounting parameters in a single uninterrupted process. The imaging means continuously captures images that provide both refraction information and mounting parameter data, eliminating the need to switch between devices or interrupt the measurement flow.
4Measurement precision
If conventional devices are used, then measurement of specific parameters is improved, but adaptability deteriorates as they cannot measure all visual behaviors
Solution Approach 1:
The measuring device is designed with multi-functionality to perform refraction measurement, mounting parameter measurement, and imaging functions all in one apparatus. This universal device can measure various parameters including refraction, pupillary distance, half-deviations, height, pantoscopic angle, lens-to-eye distance, and center position rotation, eliminating the need for multiple specialized devices.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise, rapid, and reliable measurement of ocular refraction characteristics across various vision conditions and postures, reducing the need for multiple devices and improving measurement accuracy by aligning the optical axis with the subject's gaze and using a dichroic mirror for beam combination.
Implementation Method 1
adapted to receive an ocular refraction beam by refracting the at least one illumination beam onto the eyes of the subject
Implementation Method 2
use of a dichroic mirror for beam combination
Data Source
Figure 1
Figure 2a~2b
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AI summary
The invention relates to a device for measuring the objective ocular refraction of a patient for a plurality of visual ranges, which includes a variable proximity optical sight system capable of selectively generating a first target and a second target and an image-capturing device having an optical measurement axis intended for being aligned with a line of sight of the patient, the image-capturing device being capable of capturing a first ocular refraction image when the first target is activated and a second ocular refraction image when the second target is activated. According to the invention, the image-capturing device and the optical sight system are arranged such that the optical measurement axis and the optical sight axis are arranged such that the optical measurement axis and the optical sight axis are contained in a single plane and the optical measurement axis is tilted at an angle alpha between +5 degrees and +85 degrees relative to the horizontal.