8.1 Visual lobe concepts 8.2 Single glimpse probability 8.3 Cumulative search probability 8.4 Practical applications References
9. GENERAL CONSIDERATIONS OF INDIRECT IMAGERY
There is an increasing tendency in this age for us to need to use our eyes to view other than directly. By this is implied the very considerable employment nowadays of visual aids* of one form or another (binoculars, telescopes, microscopes etc.), and of such media as photography, television and image tubes. With all these devices it is rare that the image produced, and viewed as an object stimulus by the eyes, is perfect. In addition, particularly with certain forms of binocular optical aid, there can be problems at the man / aid interface. The purpose of this chapter is to draw attention to the differences between naked eye (or direct) vision and the various forms of indirect vision. The reader will be introduced to concepts and directed to other parts of this book and other literature for fuller study.
*Visual aids are here defined as optical transmission systems which present an aerial image to the eye.
9.1 Vision through visual aids 9.2 Viewing of diffuse secondary images 9.3 Conclusions References
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