An ophthalmic photographic apparatus determines whether an eye under examination is the left eye or the right eye. One embodiment of the present invention has a light-emitting device which includes at least two kinds of luminescence center materials, and at least one kind of the luminescence center materials is a quinoxaline derivative represented by the following general formula :wherein R1 to R4 are individually hydrogen or an alkyl group having 4 carbon atoms. This code is then exclusive OR’d with the incoming data stream to produce spread data.