Optometric apparatus
AssigneeNidek Co., Ltd.
InventorKenji NAKAMURA
Life of this patent
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Abstract
An optometric apparatus includes an optotype presenting optical system for presenting part of a plurality of optotypes corresponding to visual acuity to be measured to an examinee's eye and a visible light source for irradiating illumination light to the optotypes presented to the eye through the optotype presenting optical system. A controller is configured to execute processing of changing a light amount of the illumination light to be irradiated to the optotypes from the visible light source between a predetermined first light amount and a second light amount lower than the first light amount and processing of switching the optotypes to be presented to the eye at the time of changing the light amount of the illumination light from the first light amount to the second light amount.
Claims10
An optometric apparatus includes:
- an optotype presenting part including a plurality of optotypes corresponding to visual acuity to be measured and being configured to present part of the plurality of optotypes to an examinee's eye;
- and
- a controller configured to switch a measurement mode of a visual acuity test between a first measurement mode and a second measurement mode in which a visual acuity value of the examinee's eye is apt to become lower than in the first measurement mode and configured to switch the optotypes at a time of switching from the first measurement mode to the second measurement mode.
An optometric apparatus including:
- an optotype plate having a plurality of optotypes corresponding to visual acuity to be measured;
- an optotype presenting part configured to selectively present part of the plurality of optotypes of the optotype plate to an examinee's eye;
- an illumination light source to irradiate illumination light to the optotype plate;
- and
- a controller configured to change output of the illumination light source or drive a filter for restricting light traveling from the illumination light source toward the optotype plate to change a light amount of the illumination light to be irradiated to the optotype plate from a first light amount to a second light amount lower than the first light amount and configured to switch the optotypes to be presented to the examinee's eye by the optotype presenting part from among the optotypes of the optotype plate at a time of switching the first light amount to the second light amount.
An optometric apparatus including:
- an optotype plate including a plurality of optotypes corresponding to visual acuity to be measured;
- an optotype presenting part configured to selectively present part of the plurality of optotypes of the optotype plate to an examinee's eye;
- a glare light source configured to emit glare light to the examinee's eye;
- and
- a controller configured to switch the glare light source from an unlighted state to a lighted state and switch the optotypes to be presented to the examinee's eye by the optotype presenting part from among the optotypes of the optotype plate at a time of switching the unlighted state to the lighted state.
Dependencies are inferred from the claim text.