The present invention provide an ophthalmologic device and the method of operating the ophthalmologic device used for determining optimal addition power closer to a natural vision state. The device includes a visual target presenting unit configured to present a common visual target to be viewed with both subject's eyes； a presenting distance changing unit configured to change a presenting distance of the visual target presented by the visual target presenting unit from a predetermined far vision distance to a predetermined near vision distance； an ocular characteristic acquiring unit configured to objectively acquire an optical characteristic of the subject's eyes； an addition power adding unit configured to add the addition power to the both subject's eyes； and a control unit configured to cause the presenting distance changing unit to change the presenting distance and the ocular characteristic acquiring unit to continuously acquire the optical characteristic, in a state in which an addition power is added to the both subject's eyes by the addition power adding unit.
