Ophthalmic apparatus
AssigneeCanon Kabushiki Kaisha
InventorTomoyuki Iwanaga
Life of this patent
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Abstract
There is disclosed an ophthalmic apparatus including a detection unit which detects a vision fixation state of an eye to be examined, a projection unit which projects a fixation mark onto a fundus of the eye, and a fixation mark control unit which controls the projection unit. The projection unit includes a changing unit which changes a fixation mark to be projected onto the fundus, and when a vision fixation state detected by the detection unit does not satisfy a predetermined criterion, the fixation mark control unit controls the changing unit to change a fixation mark to be projected onto the fundus.
Claims19
An ophthalmic apparatus comprising:
- a detection unit which detects a vision fixation state of an eye to be examined;
- a projection unit which projects a fixation mark onto a fundus of the eye;
- and
- a fixation mark control unit which controls said projection unit,
- wherein said projection unit includes a changing unit which changes a fixation mark to be projected onto the fundus, and said fixation mark control unit controls said changing unit to change a fixation mark to be projected onto the fundus when a vision fixation state detected by said detection unit does not satisfy a predetermined criterion.
An ophthalmic apparatus comprising:
- an observation unit which observes an anterior ocular segment of an eye to be examined by illuminating the anterior ocular segment and sensing an image thereof;
- an alignment index detection unit which detects a cornea reflected index image of an alignment index for position detection upon projecting the alignment index onto the cornea of the eye;
- a line-of-sight detection unit which detects a line of sight of the eye based on outputs from said observation unit and said alignment index detection unit;
- a determination unit which determines whether a vision fixation state of the eye detected by said line-of-sight detection unit satisfies a predetermined condition;
- a fixation mark projection unit which projects a fixation mark onto a fundus of the eye;
- a fixation mark presentation changing unit which changes a presentation method for the fixation mark projected by said fixation mark projection unit;
- and
- an arithmetic processing unit,
- wherein when said determination unit determines that a vision fixation state detected by said line-of-sight detection unit does not satisfy the predetermined condition, said arithmetic processing unit controls said fixation mark presentation changing unit to change the presentation method for the fixation mark.
Dependencies are inferred from the claim text.