"One of the attractions of working in vision is that it is a field which still demands a certain degree of technical virtuosity. At a time when much of biology---all the molecular end---seems to be tending towards mass–production, …, experimentation in vision has managed to remain something of a craft as well as a science. An aspiring latter–day Helmholtz needs some familiarity with electronics, skill in programming computers and an understanding of their hardware, knowledge in physical and physiological optics, and a mastery of the techniques of experimental design and statistical analysis and inference, and some acquaintance with signal detection theory, information theory, signal processing, Fourier analysis, … "
Carpenter, R.H.S. and Robson, J.G. (1998), Preface. In: Vision Research: A Practical Guide to Laboratory Methods. Cambridge: CUP.