Ophthalmic Instrument Rotatable Mirror Eccentric Optical Quality
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Solution Overview
Problem
Current ophthalmic instruments for measuring optical quality are limited in their ability to accurately assess peripheral refraction and off-axis optical quality due to constraints in gaze stability, mechanical safety, and flexibility, particularly in younger populations where myopia development is a concern.
Innovation Solution
An ophthalmic instrument featuring a multi-element eyepiece and a rotatable mirror, along with a diopter detection system, beacon system, fixation system, and pupil positioning system, which allows for adjustable light angles and wide-range eccentricity illumination, enabling accurate measurement of optical quality across a broader field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a scanning relay moves around the head to allow fixed open field of view, then the field of view coverage is improved, but the mechanical rotation speed limits measurement productivity and imposes safety constraints
Solution Approach 1:
The patent replaces the mechanical rotation system with an optical scanning system using galvanometer mirrors. The mirrors deflect light beams to scan across the retina without mechanical rotation of the entire instrument, eliminating speed limitations and safety constraints while maintaining wide field of view coverage.
Solution Approach 2:
The patent extracts the rotation function from the main instrument body and implements it through independent galvanometer mirrors that can rapidly deflect light. This separates the field of view coverage function from the mechanical rotation constraint, allowing high-speed scanning.
2Measurement precision
If multiple prisms are used for different field of view positions, then the optical quality measurement capability is improved, but the device complexity and flexibility deteriorate
Solution Approach 1:
The patent uses a single galvanometer mirror system that can be positioned at different locations in the optical path to perform multiple functions: scanning across the retina, measuring optical quality at different eccentricities, and characterizing peripheral refraction. This replaces the need for multiple dedicated prisms.
Solution Approach 2:
The patent implements dynamic positioning of the galvanometer mirror to achieve different measurement objectives. The mirror can be rapidly repositioned between different field of view positions, providing flexibility and adaptability without requiring multiple fixed optical elements.
3Measurement precision
If gaze fixation is required for eccentric visual stimulation, then the measurement of peripheral refraction is achieved, but the reliability deteriorates due to unstable gaze especially in younger populations
Solution Approach 1:
The patent uses the eye's own optical system to guide the measurement. The instrument scans light across the retina and uses the reflected light to automatically determine optical quality at each position without requiring the patient to maintain stable gaze. The system adapts to natural eye movements.
Solution Approach 2:
The patent incorporates feedback mechanisms where the detected light from the retina is used to continuously update and refine the measurement process. This allows the system to compensate for gaze instability and maintain measurement reliability in younger populations.
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 objective detection of optical quality at high eccentricity, providing complete optical properties of the eye, improving the assessment of myopia progression and enabling customized vision corrections.
Implementation Method 1
A mirror surface of the rotatable mirror (11) is optically conjugated with a first focal plane (2) in an object space of the multi-element eyepiece (35) through a first lens (10)
Implementation Method 2
a multi-element eyepiece includes an eyepiece, a field lens and a second lens arranged in sequence
Data Source
AI summary
An ophthalmic instrument for measuring optical quality of an eye is provided, including: a multi-element eyepiece and a rotatable mirror. A mirror surface of the rotatable mirror is optically conjugated with a first focal plane in an object space of the multi-element eyepiece through a first lens, to adjust an angle of light entering the eye. A focal point of the first lens is arranged in a virtual focal plane of the multi-element eyepiece. The multi-element eyepiece includes an eyepiece, a field lens and a second lens arranged in sequence. The field lens includes a third lens, a fourth lens and a fifth lens arranged in sequence. The eyepiece, the third lens, the fourth lens and the fifth lens each is a positive lens, and the second lens is a negative lens.