In this volume Professor Janáky summarizes 30 years of experience as an ophthalmologist and researcher in the use of electrophysiological methods in the ophthalmological practice. The central theme of this summary is - as the title suggests- to show how important it is to use the various electrophysiological methods together to "see the whole"- that is, to gain a comprehensive picture of the functional status of the visual system of the individual patient. On the one hand, this is obvious, as the visual system functions as a unit, while on the other hand, practicing ophthalmologists and neurologists often make this distinction and order only those tests that they perceive as belonging to their field- thus missing part of the picture. The text discusses standardized and non-standardized but still useful testing methods including methods recommended to be used with special needs populations (such as the mentally disabled and poorly cooperating children). Specific clinical cases aredescribed to help the reader understand why it is important to use the electrophysiological methods in combination and how they can help the clinician reach the correct diagnosis.