Ophthalmic photographing apparatus
    181.
    发明授权

    公开(公告)号:US11998274B2

    公开(公告)日:2024-06-04

    申请号:US17266973

    申请日:2019-08-07

    CPC classification number: A61B3/112 A61B3/0008 A61B3/15

    Abstract: An ophthalmic photographing apparatus enables easy detection of a pupil diameter. The ophthalmic photographing apparatus is provided with an anterior ocular segment illumination unit for illuminating an anterior ocular segment of a subject eye with invisible light, an imaging element that is sensitive to at least invisible light and captures an image of the subject eye, and a processing unit for processing the image captured by the imaging element. When an image of an index projected onto the anterior ocular segment satisfies a predetermined condition, the processing unit starts detection of a pupil diameter of the subject eye by using the image on the imaging element formed by invisible light reflected from the anterior ocular segment.

    LENS BARREL AND KNOB FALLING-OFF PREVENTION MEMBER

    公开(公告)号:US20240085655A1

    公开(公告)日:2024-03-14

    申请号:US18262889

    申请日:2022-01-27

    CPC classification number: G02B7/022 G02B7/023

    Abstract: According to one or more embodiments of the disclosure, a lens barrel includes an operation member and a knob. The operation member is disposed to be rotatable in a circumferential direction with respect to a lens barrel body. The knob is restricting and fixing rotation of the operation member in the circumferential direction. The lens barrel further includes a knob falling-off prevention member capable of switching between a first state of making the knob detachable from the lens barrel body and a second state of making the knob non-detachable from the lens barrel body.

    Tear fluid layer evaluation method, computer program, and device

    公开(公告)号:US11717152B2

    公开(公告)日:2023-08-08

    申请号:US16627683

    申请日:2018-07-03

    Inventor: Katsumi Yabusaki

    Abstract: A method, a computer program and a device for evaluating a tear fluid layer non-invasively. The method, computer program, and device include a step of detecting a time when color information in a predetermined region in a tear fluid layer interference fringe image changes by a threshold value or more as an eyelid opening time, a step of extracting an image at the time when the predetermined time has passed from the eyelid opening time as an extracted image from the tear fluid interference fringe images, a determination value calculation step of calculating a determination value from the color information in a pixel in a local region by scanning a predetermined target region, a step of detecting a corresponding pixel by comparing the calculated determination value and a threshold value, and an evaluation step of evaluating tear fluid layer breakdown by comparing the detected pixel and a threshold value.

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