an ophthalmologic examination apparatus has a main unit housing an illuminating optical system that illuminates a fundus of a subject &# 39 ; s eye to be examined and an imaging optical system that images the illuminated eye fundus . first and second attachment units are removably and exchangeably mounted to the main unit for providing different ophthalmologic functions . the first attachment unit houses an imaging device that captures an image of the eye fundus via the imaging optical system housed in the main unit . the second attachment unit houses a light source that emits stimulating light for an electroretinogram and which is projected onto the eye fundus via the imaging optical system housed in the main unit .