Application US20190082957

OPHTHALMIC APPARATUS
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US20190082957

1. An ophthalmic apparatus comprising: (2) (5)

a data acquisition device that acquires three dimensional data by applying optical coherence tomography to a fundus of a subject's eye;

a distribution data generator that generates distribution data of a predetermined measurement value in the fundus based on the three dimensional data;

a correction value calculator that calculates a magnification correction value based on a predetermined condition for acquiring the three dimensional data;

a magnification corrector that changes at least one of a size of standard distribution data generated in advance for the predetermined measurement value and a size of the distribution data, based on the magnification correction value; and

a data comparator that compares the standard distribution data and the distribution data with each other, at least one of whose sizes has been changed by the magnification corrector.

2. The ophthalmic apparatus of claim 1, wherein the correction value calculator comprises a first calculator that calculates an estimated value of axial length of the subject's eye based on the predetermined condition, and the correction value calculator calculates the magnification correction value based on at least the estimated value of the axial length. (1) (0)

3. The ophthalmic apparatus of claim 2, further comprising an alignment device for performing alignment of the data acquisition device with respect to the subject's eye, wherein (2) (2)

the data acquisition device comprises: an interference optical system that splits light from a light source into measurement light and reference light, projects the measurement light onto the fundus, generates interference light by superposing returning light of the measurement light from the subject's eye on the reference light, and detects the interference light; and

an optical path length changing device that changes at least one of an optical path length of the measurement light and an optical path length of the reference light, and

the first calculator calculates the estimated value of the axial length based on at least a result of the alignment, the optical path length of the measurement light, and the optical path length of the reference light.

4. The ophthalmic apparatus of claim 3, wherein (0) (2)

5. The ophthalmic apparatus of claim 3, wherein (0) (2)

6. The ophthalmic apparatus of claim 1, wherein the correction value calculator comprises a second calculator that calculates an estimated value of diopter of the subject's eye based on the predetermined condition, and the correction value calculator calculates the magnification correction value based on at least the estimated value of the diopter. (1) (0)

7. The ophthalmic apparatus of claim 6, wherein (2) (3)

the data acquisition device comprises an interference optical system that splits light from a light source into measurement light and reference light, projects the measurement light onto the fundus, generates interference light by superposing returning light of the measurement light from the subject's eye on the reference light, and detects the interference light,

the ophthalmic apparatus further comprises a focus adjustment device for performing focus adjustment of the interference optical system, and

the second calculator calculates the estimated value of the diopter based on a focus state of the interference optical system.

8. The ophthalmic apparatus of claim 7, wherein (0) (2)

9. The ophthalmic apparatus of claim 7, wherein (0) (2)

10. An ophthalmic apparatus comprising: (0) (4)

a data acquisition device that acquires three dimensional data by applying optical coherence tomography to a fundus of a subject's eye;

a distribution data generator that generates distribution data of a predetermined measurement value in the fundus based on the three dimensional data;

a data supplementation device that supplements the distribution data based on predetermined information when the distribution data does not comprise data corresponding to part of standard distribution data generated in advance for the predetermined measurement value; and

a data comparator that compares the distribution data after supplementation with the standard distribution data.

11. An ophthalmic apparatus comprising: (0) (5)

a reception part that receives three dimensional data acquired by applying optical coherence tomography to a fundus of a subject's eye and a predetermined condition for acquiring the three dimensional data;

a distribution data generator that generates distribution data of a predetermined measurement value in the fundus based on the three dimensional data;

a correction value calculator that calculates a magnification correction value based on the predetermined condition;

a data comparator that compares the standard distribution data and the distribution data with each other, at least one of whose sizes has been changed by the magnification corrector.

12. An ophthalmic apparatus comprising: (0) (4)

a reception part that receives distribution data, generated based on three dimensional data acquired by applying optical coherence tomography to a fundus of a subject's eye, of a predetermined measurement value in the fundus and a predetermined condition for acquiring the three dimensional data;

a correction value calculator that calculates a magnification correction value based on the predetermined condition;

a data comparator that compares the standard distribution data and the distribution data with each other, at least one of whose sizes has been changed by the magnification corrector.

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Application US20190082957

OPHTHALMIC APPARATUS

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