Ophthalmologic measuring device

JP2024101520A5Pending Publication Date: 2026-06-16NIDEK CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
NIDEK CO LTD
Filing Date
2023-07-28
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing ophthalmological measurement devices face challenges in obtaining accurate and appropriate measurement results due to difficulties in distinguishing adjacent ring images, particularly when the ring images become dense or distorted by conditions such as intraocular reflections and scattering, especially in eyes with cataracts.

Method used

The device employs a limiting member positioned at a conjugate location with a conversion member to control the measurement area, allowing for selective reception of ring images by the light-receiving element, and includes a processing unit to process these images to obtain refractive power information. This is achieved through the use of limiting members that restrict the measurement area in multiple patterns, diopter correction, and mode switching to accommodate different eye conditions.

Benefits of technology

The solution enables more accurate and appropriate measurement results by ensuring clear distinction between ring images, even in challenging conditions, and allows for precise refractive power distribution analysis.

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Abstract

To acquire a more accurate and more appropriate measurement result.SOLUTION: An ophthalmologic measuring device includes: a measurement optical system for projecting measurement light onto the ocular fundus of an eye to be examined and causing a light receiving element to receive reflection light of the measurement light from the ocular fundus of the eye to be examined; a conversion member disposed at a pupil conjugate position of the eye to be examined in the measurement optical system for converting the reflection light from the ocular fundus into a multiplex ring image and causing the light receiving element to receive the multiplex ring image; limiting means having a limiting member arranged at a conjugate position of the conversion member or in the vicinity of the conversion member for changing a measurement region in the eye to be examined by limiting a part of the ring image received by the light receiving element by a limiting member; limit control means for controlling the limiting means and changing the measurement region in the eye to be examined that is changed by the limiting member in at least two or more patterns; and processing means for processing the ring image received by the light receiving element to acquire eye refractive power information.SELECTED DRAWING: Figure 2
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