Ophthalmological Device Scanning for Stable Eye Axis Measurement
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Solution Overview
Problem
Conventional ophthalmological devices face difficulties in measuring the dimension along the eye axis of a target portion, such as the depth of the anterior chamber and the thickness of the crystalline lens, due to insufficient intensity of reflected light from both the anterior and posterior surfaces, leading to unstable calculation of these dimensions.
Innovation Solution
The device includes a light source, a measurement optical system, a reference optical system, and an arithmetic unit that scans light in a predetermined region around the cornea apex to maximize the intensity of reflected light from both surfaces, allowing for stable specification of the anterior and posterior surfaces and accurate calculation of the dimension along the eye axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If light is emitted at a fixed position to measure the eye axis dimension, then the measurement process is simple, but the intensity of reflected light from both anterior and posterior surfaces cannot be sufficiently received
Solution Approach 1:
The patent applies the dynamics principle by making the light emission position variable rather than fixed. The incidence position changing member dynamically adjusts the light emission position across multiple locations in the predetermined region, allowing the system to receive reflected light with sufficient intensity from both anterior and posterior surfaces by optimizing the illumination angle for each surface reflection path.
2Reliability
If the light emission position is varied to increase reflected light intensity, then the measurement stability improves, but the device complexity increases due to additional scanning mechanisms
Solution Approach 1:
The system implements dynamic position adjustment through the incidence position changing member that can be driven by the driving unit to scan across different positions in the predetermined region. This dynamic capability enables the system to adapt to different eye geometries and optimize light reflection paths, thereby improving measurement stability and reliability.
Solution Approach 2:
The patent applies parameter changes by varying the emission position parameter across multiple locations in the predetermined region. By changing the spatial parameters of light emission and receiving at different positions, the system maximizes the intensity of reflected light from both surfaces, leading to more stable and reliable dimension measurements.
3Measurement precision
If light is received from multiple positions to ensure sufficient intensity from both surfaces, then the measurement accuracy improves, but the measurement time increases
Solution Approach 1:
The dynamic scanning mechanism efficiently collects light from multiple positions by rapidly moving the emission and reception positions through the predetermined region. This dynamic approach allows the system to gather sufficient reflected light intensity from both anterior and posterior surfaces without requiring excessive measurement time, as the scanning operation can be performed at high speed across the required angular range.
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
This configuration ensures that reflected light with sufficient intensity is obtained from both surfaces, enabling precise and stable measurement of the eye axis dimension, even when light is incident at different positions, thereby accurately determining the thickness and depth of the target portion.
Implementation Method 1
emit light from a light source into an eye to be examined and guide reflected light
Implementation Method 2
Based on interfering light composed of reflected light that is guided by the measurement optical system and reflected light that is guided by the reference optical system
Implementation Method 3
emit light from the light source to a reference surface and guides reflected light
Data Source
Figure 1
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Figure 4a~4b
AI summary
An ophthalmological device emits light from a measurement optical system to an eye (100) to be examined and calculates a dimension along the eye axis of a target portion of the eye (100) from interfering light composed of reflected light from the eye (100) and reference light. The measurement optical system includes incidence a position changing member that changes the incidence position of light emitted to the eye (100), and a driving unit that drives the incidence position changing member so as to scan at the incidence position of emitted light in a predetermined region of the eye (100). The predetermined region is a region where a straight line passes through when the straight line radially extended from the cornea apex (110) of the eye (100) is circumferentially moved over a predetermined angle range in the case of the eye (100) is viewed from the front.