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Ophthalmologic apparatus and method thereof

An ophthalmic device and ophthalmic technology, which is applied in the fields of ophthalmoscope, medical science, and equipment for testing eyes, etc., can solve the problems of reduced segmentation mark accuracy and blurred segmentation mark images.

Inactive Publication Date: 2014-05-21
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, the segmentation marker image is very blurred, and the accuracy of the calculated evaluation value of the segmentation marker may decrease

Method used

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  • Ophthalmologic apparatus and method thereof
  • Ophthalmologic apparatus and method thereof
  • Ophthalmologic apparatus and method thereof

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no. 1 example

[0016] refer to Figure 1 to Figure 4 A fundus camera as an ophthalmic apparatus according to a first embodiment of the present invention and a photographing method using the fundus camera will be described in detail.

[0017] figure 1 is a schematic diagram for explaining the first embodiment of the present invention.

[0018] The fundus camera is mainly composed of an imaging light source unit O1, an observation light source unit O2, an illumination optical system O3, an imaging / illumination optical system O4, an imaging optical system O5, and an internal fixation target unit O6. The light beam emitted from the imaging light source unit O1 or the observation light source unit O2 illuminates the fundus of the subject through the illumination optical system O3 and the imaging / illumination optical system O4. The corresponding images are formed on the imaging element via the photographing / illumination optical system O4 and the photographing optical system O5.

[0019] The ima...

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Abstract

The invention provides an ophthalmologic apparatus and a method thereof. The ophthalmologic apparatus obtains a suitable defocus state early in split AF even immediately after the apparatus shifts to a fundus observation state. At the time of focus state detection immediately after the shift to the fundus observation state, the apparatus tarns the fundus observing illumination light off if a focus determination unit determines that the defocus amount is equal to or more than a predetermined value, and turns the fundus observing illumination light on if the focus determination unit determines that an in-focus state immediately before photographing is obtained, thereby allowing the examiner to check a fundus state immediately before photographing.

Description

technical field [0001] The present invention relates to ophthalmic devices and ophthalmic methods. Background technique [0002] Regarding ophthalmic devices, in order to improve the accuracy of autofocus or autoalignment, Japanese Patent Application Laid-Open No. 05-95907 proposes a technique of improving the detectability of a marker beam by attenuating other beams when performing detection processing using a marker beam. [0003] When performing split AF based on the evaluation value of the split flag (hereinafter, a split automatic focusing operation (split automatic focusing operation) will be referred to as split AF or AF), if the defocus amount is large before performing AF, the fundus observation image Sometimes so blurry that it becomes a visually undesirable image. In this case, the segmented marker image is very blurred, and the accuracy of the calculated evaluation value of the segmented marker may decrease. Contents of the invention [0004] The present inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/15A61B3/12
CPCA61B3/14
Inventor 相川聪
Owner CANON KK