Ophthalmologic Device Pupil State Measurement
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Solution Overview
Problem
Conventional ophthalmologic devices struggle to accurately measure pupil states during objective measurements, particularly when miosis occurs, leading to potential errors and complications in device design and increased costs due to the need for multiple cameras for refractive power and anterior ocular segment imaging.
Innovation Solution
An ophthalmologic device equipped with at least two imaging units that simultaneously photograph the anterior ocular segment from different directions, allowing for accurate pupil state measurement and reducing device complexity and cost by integrating pupil state measurement with ocular characteristic measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single photoelectric detector is used for both refractive power measurement and anterior ocular segment imaging, then device complexity is reduced, but measurement precision of pupil state during objective measurement deteriorates
Solution Approach 1:
The invention divides the imaging function into two separate imaging units: one dedicated to anterior ocular segment imaging and another to pupil state measurement during objective measurement. This segmentation allows each imaging unit to be optimized for its specific function, ensuring high measurement precision for pupil state while maintaining reasonable device complexity through functional specialization rather than using a single multi-functional detector.
Solution Approach 2:
The invention makes the imaging units universal by enabling them to serve multiple purposes: the first imaging unit captures both anterior ocular segment images and pupil state information, while the second imaging unit provides redundant pupil state measurement capability. This multi-functionality allows the system to achieve accurate pupil state measurement during objective measurement without requiring completely separate dedicated hardware for each function.
2Measurement precision
If multiple cameras are used for refractive power measurement and anterior ocular segment imaging, then measurement precision is improved, but device complexity and size increase
Solution Approach 1:
The invention merges the pupil state measurement function with the anterior ocular segment imaging function by using the first imaging unit for both purposes. The system combines the capabilities of what would traditionally require separate cameras into a single integrated imaging path, while adding a second imaging unit only for the specific purpose of pupil state measurement during objective measurement, thereby avoiding the need for multiple completely separate imaging systems.
Solution Approach 2:
The first imaging unit is designed to be universal, serving both anterior ocular segment imaging and pupil state measurement functions. This multi-functionality reduces the total number of imaging units needed compared to having completely separate dedicated cameras for each function, thereby reducing device complexity while maintaining measurement precision through the addition of the second specialized imaging unit.
3Measurement precision
If separate optical systems are used for refractive power measurement and anterior ocular segment imaging, then measurement precision is improved, but device size and cost increase
Solution Approach 1:
The invention merges the optical paths by using the first imaging unit to capture both anterior ocular segment images and pupil state information through a shared optical system. The second imaging unit is added only for the specific purpose of pupil state measurement during objective measurement, allowing the system to maintain high measurement precision while avoiding the need for completely separate optical systems that would increase device size and cost.
Solution Approach 2:
The first imaging unit is designed with universal functionality to serve both anterior ocular segment imaging and pupil state measurement through a shared optical path. This multi-functionality allows the system to achieve accurate measurement results without requiring completely separate optical systems, thereby reducing device size and cost while maintaining measurement precision through the complementary second imaging unit.
Data Source
AI summary
To provide an ophthalmologic device and a pupil state measuring method capable of securing accuracy of a measurement result of objective measurement and effective for investigating the cause of an error during objective measurement. A pupil state measuring method according to the present invention includes: an ocular characteristic measuring step of objectively measuring an ocular characteristic of a subject eye of a subject; an imaging step of substantially simultaneously imaging an anterior ocular segment of the subject eye from different directions using at least two imaging units in measuring the ocular characteristic; a measuring step of analyzing at least one image of images taken by the at least two imaging units to measure a pupil state of the subject eye; and a step of performing the imaging step and the measuring step in measuring the ocular characteristic.