Ophthalmologic apparatus

1 . An ophthalmologic apparatus comprising:

an objective measurement optical system that is configured to objectively measure eye characteristics of a subject eye;

an optotype projection system that is configured to present a fixation target to the subject eye at a predetermined presentation position and apply fog to the subject eye; and

a controller that is configured to control the objective measurement optical system and the optotype projection system;

wherein the controller is further configured to preliminarily objectively measure the eye characteristics over time by changing a presentation position of the presented fixation target from the predetermined presentation position in a direction to increase an amount of fog,

wherein the controller presumes that a tension tendency of the subject eye is prone to be tension, meaning that fogging is insufficient and the degree of relief is relatively low, so reaccommodation is likely to occur, in the event that an amount of fluctuation of the objective measurement result from the beginning of the fogging is equal to or greater than a first predetermined amount, or in the event that the sum of the amount of fluctuation in the objective measurement results each time the fixation target position is changed is equal to or greater than a second predetermined amount,

wherein the controller presumes that the tension tendency of the subject eye is not prone to be tension, meaning that tension is sufficiently relieved and reaccommodation is not likely to occur, in the event that the amount of fluctuation of the objective measurement result from the beginning of the fogging is equal to or less than the first predetermined amount, or in the event that the sum of the amount of fluctuation in the objective measurement results each time the fixation target position is changed is equal to or less than the second predetermined amount, and

wherein the controller is further configured to output a notification of at least one of tendency of tension of the subject eye or a state of tension of the subject eye in accordance with the preliminary objective measurement result of the eye characteristics measured over time, wherein the notification is output at an end of the preliminary objective measurement of the eye characteristics over time and before a main measurement of the eye characteristics.

2 . The ophthalmologic apparatus according to claim 1 , wherein the controller is further configured to set an amount of fog to be increased when changing the presentation position of the fixation target in accordance with an objective measurement result of the eye characteristics measured over time.

3 . The ophthalmologic apparatus according to claim 1 , wherein the controller is further configured to change the presentation position of the fixation target and determine whether or not to continue applying the fog to the subject eye in accordance with an objective measurement result of the eye characteristics measured over time.

4 . The ophthalmologic apparatus according to claim 3 , wherein the controller is further configured to

finish changing the presentation position of the fixation target when fluctuation of the objective measurement result has converged to a predetermined range; and

change the presentation position of the fixation target in a direction to increase the amount of fog and continue applying the fog to the subject eye when the fluctuation of the objective measurement result has not converged to the predetermined range.

5 . The ophthalmologic apparatus according to claim 1 , wherein the controller is further configured to show, in a graph, a relationship between the amount of fog when presenting the fixation target and an objective measurement result of the eye characteristics measured over time.

6 . The ophthalmologic apparatus according to claim 1 , further comprising a subjective measurement optical system that is configured to subjectively measure eye characteristics of a subject eye; and

wherein the controller is further configured to adjust settings of the subjective measurement optical system in accordance with an objective measurement result of the eye characteristics measured over time, and measure the eye characteristics by the subjective measurement optical system.

7 . The ophthalmologic apparatus according to claim 1 ,

wherein the objective measurement optical system comprises:

a left-eye objective measurement system that is configured to objectively measure the eye characteristics of a left subject eye; and

a right-eye objective measurement system that is configured to objectively measure the eye characteristics of a right subject eye.

8 . The ophthalmologic apparatus according to claim 7 , wherein the objective measurement optical system is configured to objectively measure the eye characteristics of the left subject eye and the eye characteristics of the right subject eye one by one.

9 . The ophthalmologic apparatus according to claim 1 , further comprising a transmitter that is configured to transmit information to a second ophthalmologic apparatus, the second ophthalmologic apparatus comprising a subjective measurement optical system that is configured to subjectively measure the eye characteristics of the subject eye; and

wherein the controller is further configured to transmit an objective measurement result of the eye characteristics measured over time to the second ophthalmologic apparatus via the transmitter for use in setting measurement conditions of the subjective measurement optical system of the second ophthalmologic apparatus.

10 . The ophthalmologic apparatus according to claim 1 ,

wherein the controller is configured to perform fogging control, and the fogging control is performed between the preliminary measurement and the main measurement.

11 . The ophthalmologic apparatus according to claim 10 ,

wherein the preliminary measurement corresponds to a step of focusing the subject eye on a fogging start position, and the main measurement is a step of measuring predetermined eye characteristics.

12 . The ophthalmologic apparatus according to claim 1 ,

wherein the change in the presentation position of the fixation target and the objective measurement associated with the change are repeated until the amount of fog reaches a prescribed amount of fog set in advance.

13 . A non-transitory computer-readable storage medium storing a program that, when executed by a processor, causes the processor to:

control an ophthalmologic apparatus comprising:

an objective measurement optical system that is configured to objectively measure eye characteristics of a subject eye;

an optotype projection system that is configured to present a fixation target to the subject eye at a predetermined presentation position and apply fog to the subject eye; and

a controller that is configured to control the objective measurement optical system and the optotype projection system;

preliminarily objectively measure the eye characteristics over time by changing a presentation position of the presented fixation target from the predetermined presentation position in a direction to increase an amount of fog;

presume that a tension tendency of the subject eye is prone to be tension, meaning that fogging is insufficient and the degree of relief is relatively low, so reaccommodation is likely to occur, in the event that an amount of fluctuation of the objective measurement result from the beginning of the fogging is equal to or greater than a first predetermined amount, or in the event that the sum of the amount of fluctuation in the objective measurement results each time the fixation target position is changed is equal to or greater than a second predetermined amount;

presume that the tension tendency of the subject eye is not prone to be tension, meaning that tension is sufficiently relieved and reaccommodation is not likely to occur, in the event that the amount of fluctuation of the objective measurement result from the beginning of the fogging is equal to or less than the first predetermined amount, or in the event that the sum of the amount of fluctuation in the objective measurement results each time the fixation target position is changed is equal to or less than the second predetermined amount; and

output a notification of at least one of tendency of tension of the subject eye or a state of tension of the subject eye in accordance with the preliminary objective measurement result of the eye characteristics measured over time, wherein the notification is output at an end of the preliminary objective measurement of the eye characteristics over time and before a main measurement of the eye characteristics.

14 . The non-transitory computer-readable storage medium according to claim 13 , wherein the program, when executed by the processor, further causes the processor to set an amount of fog to be increased when changing the presentation position of the fixation target in accordance with an objective measurement result of the eye characteristics measured over time.

15 . The non-transitory computer-readable storage medium according to claim 13 , wherein the program, when executed by the processor, further causes the processor to change the presentation position of the fixation target and determine whether or not to continue applying the fog to the subject eye in accordance with an objective measurement result of the eye characteristics measured over time.

16 . The non-transitory computer-readable storage medium according to claim 15 , wherein the program, when executed by the processor, further causes the processor to

finish changing the presentation position of the fixation target when fluctuation of the objective measurement result has converged to a predetermined range; and

change the presentation position of the fixation target in a direction to increase the amount of fog and continue applying the fog to the subject eye when the fluctuation of the objective measurement result has not converged to the predetermined range.

17 . The non-transitory computer-readable storage medium according to claim 13 , wherein the program, when executed by the processor, further causes the processor to show, in a graph, a relationship between the amount of fog when presenting the fixation target and an objective measurement result of the eye characteristics measured over time.

18 . The non-transitory computer-readable storage medium according to claim 13 , wherein the ophthalmologic apparatus further comprises a subjective measurement optical system that is configured to subjectively measure eye characteristics of a subject eye, and

wherein the program, when executed by the processor, further causes the processor to adjust settings of the subjective measurement optical system in accordance with an objective measurement result of the eye characteristics measured over time, and measure the eye characteristics by the subjective measurement optical system.

19 . The non-transitory computer-readable storage medium according to claim 13 , wherein the objective measurement optical system comprises:

a left-eye objective measurement system that is configured to objectively measure the eye characteristics of a left subject eye; and

a right-eye objective measurement system that is configured to objectively measure the eye characteristics of a right subject eye.

20 . The non-transitory computer-readable storage medium according to claim 19 , wherein the objective measurement optical system is configured to objectively measure the eye characteristics of the left subject eye and the eye characteristics of the right subject eye one by one.

21 . The non-transitory computer-readable storage medium according to claim 13 , wherein the ophthalmologic apparatus further comprises a transmitter that is configured to transmit information to a second ophthalmologic apparatus, the second ophthalmologic apparatus comprising a subjective measurement optical system that is configured to subjectively measure the eye characteristics of the subject eye; and

wherein the program, when executed by the processor, further causes the processor to transmit an objective measurement result of the eye characteristics measured over time to the second ophthalmologic apparatus via the transmitter for use in setting measurement conditions of the subjective measurement optical system of the second ophthalmologic apparatus.

22 . The non-transitory computer-readable storage medium according to claim 13 , wherein the program, when executed by the processor, further causes the processor to perform fogging control, and the fogging control is performed between the preliminary measurement and the main measurement.

23 . The non-transitory computer-readable storage medium according to claim 22 , wherein the preliminary measurement corresponds to focusing the subject eye on a fogging start position, and the main measurement corresponds to measuring predetermined eye characteristics.

24 . The non-transitory computer-readable storage medium according to claim 13 , wherein the change in the presentation position of the fixation target and the objective measurement associated with the change are repeated until the amount of fog reaches a prescribed amount of fog set in advance.