There is provided a method of controlling an ophthalmic device having a first retinal image acquisition module operable to image an imaging region of a retina and an illumination module operable to concurrently illuminate an illumination region of the retina, the imaging region and the illumination region having a predetermined positional relationship to one another, the method comprises: controlling (S10) the first retinal image acquisition module to acquire a reference retinal image by imaging a reference imaging area of the retina； designating (S20) a target in the reference retinal image； controlling (S30) the first retinal image acquisition module to acquire a current retinal image of an initial imaging region within the reference imaging area； controlling (S40) the first retinal image acquisition module to move its imaging region of the retina from the initial imaging region to a destination imaging region using the target and at least a portion of the reference retinal image, and to acquire a retinal image of the destination imaging region； controlling (S50') the illumination module to illuminate the illumination region of the retina while the imaging region of the first retinal image acquisition module is the destination imaging region； controlling (S60') the first retinal image acquisition module to acquire one or more retinal images while the illumination module is illuminating the illumination region of the retina； and comparing (S70) a marker retinal image based on the one or more retinal images with a comparison image based on at least a portion of the reference retinal image to determine a marker that is indicative of the position of the marker retinal image within the comparison image.
