Ophthalmic device
The present invention provides an ophthalmic device capable of minimizing the generation of flare at a lower cost and in a shorter time than in the prior arts when photographing in a state where an optical axis of an examination optical system is deviated from a reference position of a subject eye. The ophthalmic device according to an embodiment of the present invention includes a photographing unit that images a region to be observed of the subject eye through the examination optical system, a first alignment unit that performs alignment on the examination optical system with respect to the subject eye in the optical axis direction and the direction perpendicular to the optical axis direction, an optical system movement unit that moves the examination optical system from a first position aligned by the first alignment unit to a second position which is deviated from the first position at least in the perpendicular direction, and a second alignment unit that determines an alignment position in the optical axis direction of the examination optical system with respect to the subject eye at the second position based on the positional difference between the first position and the second position and moves the examination optical system to the alignment position along the optical axis direction.
1. An ophthalmic device comprising:
a photographing unit configured to photograph a region to be observed of a subject eye through an examination optical system;
a first alignment unit configured to perform alignment of the examination optical system respect to the subject eye in an optical axis direction and alignment in a perpendicular direction to the optical axis direction;
an optical system movement unit configured to move the examination optical system from a first position aligned by the first alignment unit to a second position deviated at least in the perpendicular direction; and
a second alignment unit configured to determine an alignment position in the optical axis direction of the examination optical system at the second position with respect to the subject eye based on a positional difference between the first position and the second position, and move the examination optical system to the alignment position along the optical axis direction.
2. The ophthalmic device according to claim 1 , wherein the examination optical system further comprises:
an interference optical system configured to divide light emitted from a light source into signal light and reference light, irradiate the region to be observed with the signal light and guide interference light between the signal light reflected by the region to be observed and the reference light to the photographing unit;
an optical path length changing unit provided in the interference optical system and configured to change an optical path length of at least one of the signal light and the reference light; and
an adjustment control unit configured to control the optical path length changing unit to adjust the optical path length according to a distance and a direction that the examination optical system moves in the optical axis direction in alignment by the second alignment unit.
3. The ophthalmic device according to claim 1 , further comprising:
a base; and
a frame supported movably with respect to the base at least in the perpendicular direction, wherein
the examination optical system and the photographing unit are disposed on the frame, and
the optical system movement unit moves the frame to move the examination optical system from the first position to the second position.
4. The ophthalmic device according to claim 1 , further comprising
a storage unit configured to store a correspondence relation between the positional difference and the alignment position,
wherein the second alignment unit refers to the correspondence relation stored in the storage unit based on the positional difference and determines the alignment position.
5. The ophthalmic device according to claim 1 , further comprising:
a subject eye position acquisition unit configured to acquire a three-dimensional position of the subject eye; and
a positional deviation information acquisition unit configured to acquire positional deviation information of the examination optical system in the optical axis direction and the perpendicular direction with respect to the subject eye based on the three-dimensional position acquired by the subject eye position acquisition unit, wherein
the first alignment unit performs alignment of the examination optical system through automatic control or manual control based on the positional deviation information acquired by the positional deviation information acquisition unit.