Optometric apparatus

摘要

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.

主权项

1. An optometric apparatus comprising:
an optotype presenting part, including a plurality of optotypes corresponding to visual acuity to be measured, the optotype presenting part is configured to present part of the plurality of optotypes to an examinee's eye; and a controller configured to perform simultaneously:
(i) switching a measurement mode of a visual acuity test between a first measurement mode and a second measurement mode wherein the second measurement mode is either a low contrast mode in which an optotype is presented at lower contrast than in the first measurement mode or a glare mode for visual acuity measurement to be performed in a glare lighting state, and(ii) switching the optotypes to be presented to the examinee's eye by the optotype presenting part from a first one or more optotypes of the plurality of optotypes presented during the first measurement mode to a second one or more optotypes of the plurality of optotypes which are presented during the second measurement mode and wherein at the time of the switching from the first measurement mode to the second measurement mode, the controller switches to the second one or more optotypes of the plurality of optotypes that correspond to a lower visual acuity value from the first one or more optotypes of the plurality of optotypes presented during the first measurement mode.