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There seems to be no clear consensus on the choice of symbols and terms in the field of optics. Even the choice of which direction of a directed quantity such as a ray is to be positive or negative is not standard. Many attempts have been made to find a common language that all would accept, but it seems that each textbook and each lens computer program sill has at least a few unique elements in its language. Because there is no generally accepted standard in the optics literature, we often made an independent choice as to what is used in this book. Since more significant papers about the OTF have probably been published in England than in our own country, the selection of symbols and terms becomes especially difficult when the notation accepted in England, for example, is not commonly found in the United States.
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