Visual Optics: the author's specialty, and one that is overlooked in a great many texts
In addition, the chapter on Visual Optics gives this subject thorough consideration, from both the theoretical side (e.g.
His abilities in this area were recognised when the late Harry Marton invited him to teach
Visual Optics, Ophthalmic Instrumentation and Contact Lenses to students on the Manchester course as a part-time lecturer.