Ophthalmologic Apparatus Incident Angle Adjustment for Lens Positioning
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Solution Overview
Problem
Conventional ophthalmologic apparatuses face challenges in accurately determining the position of the crystalline lens due to light scattering, resulting in insufficient reflected light intensity, which hinders precise measurement.
Innovation Solution
The apparatus incorporates an incident angle changing member that adjusts the light's angle relative to the eye's axis, a focal point adjustment mechanism, and an optical path length changing mechanism to ensure the light is radiated perpendicularly to the crystalline lens, enhancing reflected light intensity and measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the focal aim of light is adjusted to match the axis of vision of the eye, then the alignment with the visual axis is improved, but the light is radiated obliquely to the crystalline lens causing light scattering and insufficient reflected light intensity
Solution Approach 1:
The patent applies dynamics by making the optical measurement system movable relative to the eye. Specifically, the system can change its incident angle within a predetermined angular range to dynamically adjust the light radiation direction. This allows the system to adapt to the shifted normal direction of the crystalline lens, radiating light perpendicularly to the lens surface to maximize reflected light intensity while maintaining accurate position determination capability.
2Illumination intensity
If the incident angle of light is changed within a predetermined angular range, then the light can be radiated perpendicularly to the crystalline lens improving reflected light intensity, but the optical system becomes more complex
Solution Approach 1:
The patent applies universality by designing the optical measurement system to perform multiple functions: it can both radiate light to determine eye interior positions and change its incident angle to optimize light reflection from the crystalline lens. This multi-functional design allows a single system to handle both measurement and optimization tasks without requiring separate specialized devices, thereby managing complexity while achieving improved reflected light intensity.
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 allows for accurate determination of the crystalline lens position with sufficient light intensity, even in cases of lens opacity, thereby improving measurement precision and reliability.
Implementation Method 1
an optical measurement system that radiates light from the light source to inside an eye to be examined and guides reflected light from the eye
Implementation Method 2
an optical reference system that radiates light from the light source to a reference surface and guides reflected light from the reference surface
Implementation Method 3
a photo detector that detects interfering light between the reflected light from the optical measurement system and the reflected light from the optical reference system
Data Source
AI summary
An ophthalmologic apparatus comprises a light source 12, an optical measurement system 13 that radiates first light from the light source to inside an eye to be examined and guides first reflected light from the eye, an optical reference system (24, 22) that radiates second light from the light source to a reference surface and guides second reflected light from the reference surface, a photo detector 26 that detects interfering light between the first reflected light from the optical measurement system and the second reflected light from the optical reference system, and a processor that determines a position of a measuring portion of the inside of the eye based on the detected interfering light. The optical measurement system comprises an incident angle changing member 46 that changes an incident angle of the first light radiated to the eye within a predetermined angular range relative to an axis of vision of the eye.