Provided is an ophthalmologic apparatus, which can easily and quickly find a part of a crystalline lens without opacity where specific information of an eye to be inspected can be acquired (for example, eye refractive power information can be measured), when changing to a transillumination observation mode. The ophthalmologic apparatus includes: a specific information acquiring unit which acquires specific information of the eye to be inspected through a first opening a transillumination image acquiring unit which acquires a transillumination image of the eye to be inspected and a control unit which changes the first opening to a second opening smaller than the first opening when acquiring the transillumination image.
