Hand-Held Cyclodeviation Measurement Device Using Segmented Maddox Rods
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Solution Overview
Problem
Current methods for quantifying cyclodeviation, such as the Maddox double rod test and major amblyoscope, are limited in precision and cost, and are not suitable for use during surgical operations due to their design and requirements, particularly in cases of combined horizontal and vertical strabismus.
Innovation Solution
A hand-held cyclodeviation measurement device using a combination of Maddox rods and Bagolini striated lenses, with a rotatable Maddox rod and indication means, allowing for precise angle measurement and use in various positions, including during surgical operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a trial frame with Maddox rods is used for cyclodeviation measurement, then the measurement can be performed at low cost, but the measurement precision is limited due to the 5° increment scale
Solution Approach 1:
The device separates the scale from the Maddox rod assembly, placing the precision scale on the trial frame while keeping the Maddox rod independent. This allows the scale to have fine divisions without limiting the Maddox rod size, resolving the contradiction between low cost and high precision measurement
Solution Approach 2:
The invention moves the scale from being integrated with the Maddox rod to being positioned on the trial frame plane, creating a two-dimensional measurement system where the scale and optical element are separated in space, enabling independent optimization of both components
2Measurement precision
If the Maddox rod diameter is enlarged to improve measurement precision, then detailed quantitation can be achieved, but the trial frame cannot maintain parallel alignment with the forehead surface
Solution Approach 1:
The device divides the measurement system into separate functional components: the Maddox rod for optical measurement and the trial frame for positioning. The scale is attached to the trial frame rather than the Maddox rod, allowing the Maddox rod to be enlarged without affecting the alignment function of the trial frame
Solution Approach 2:
The trial frame acts as an intermediary between the enlarged Maddox rod and the patient's forehead. It provides the parallel alignment capability while the Maddox rod, positioned independently, provides the enlarged measurement scale without compromising either function
3Measurement precision
If a major amblyoscope is used for detailed cyclodeviation quantitation, then measurement precision of 1° increment is achieved, but the device cost becomes extremely high and it cannot be used during surgical operations
Solution Approach 1:
The invention creates a simple, inexpensive measurement device using basic optical components (Maddox rod, trial frame, and scale) that can be easily manufactured at low cost, replacing the expensive major amblyoscope while maintaining measurement precision
Solution Approach 2:
The invention extracts only the essential measurement function from the complex major amblyoscope system, using a simplified setup with Maddox rod and scale that achieves the same measurement precision without the unnecessary complexity and high cost of the original device
4Measurement precision
If the new cyclo test is used for cyclodeviation measurement, then detailed quantitation is possible, but it becomes difficult to perform when horizontal or vertical strabismus is combined
Solution Approach 1:
The Maddox rod measurement system is universally applicable to all types of strabismus including combined horizontal, vertical, and cyclodeviation. The linear light beam method provides a consistent measurement approach that works regardless of the specific strabismus combination, making the device versatile for all cases
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
The device provides quantitative cyclodeviation measurement at a low cost, suitable for both diagnostic and surgical settings, minimizing surgical procedures by enabling real-time correction effect assessment and accurate cyclodeviation measurement in multiple eye positions.
Implementation Method 1
observing forward point light sources through the Maddox rods to perceive two linear light beams
Implementation Method 2
a combination of Maddox rods and Bagolini striated lenses
Data Source
AI summary
Provided is a cyclodeviation measurement device capable of performing quantitative measurement at low cost and capable of being used not only for diagnosis in an examination room and but also during a surgical operation in a surgical operating room, which has not been considered so far. In addition, provided is an improved device of the above device which can perform cyclodeviation measurement at a position other than the front by stabilizing vision fixation. The cyclodeviation measurement device includes a board, a pair of Maddox rods provided on the board so that at least one Maddox rod is rotatable, a manipulation means capable of freely rotating the rotatable Maddox rod, and an indication means indicating a rotation angle of the Maddox rod. The improved device includes a pair of a Maddox rod and a Bagolini striated lens instead of a pair of the Maddox rods.