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英文摘要 The power of sight is one of a human’s most complex senses, within it there are immeasurable levels. Ophthalmic practitioners’ judgments rely on all kinds of psychological of physiological factors. We use visual acuity as an indication of our power of sight despite this being only one part of the sense of sight. Our sense of sight consists of visual acuity, peripheral visual, visual field, and contrast sensitivity, however, this list is not comprehensive. This research merely investigates the central vision part of the visual field, that is, near and far-sightedness, and based upon this has effected significant improvements on standard ophthalmic equipment. The world today is by technology, and the speech of information transmission has reached an unimaginable level. Technological developments are all with the aim of saving time in modern man’s busy life, therefore automation was a prerequisite for our research. The principle factors are: 1) Using a microcomputer to ask questions. 2) The questions asked must be based on medical principles because the visual acuity examination includes near-sightedness, far-sightedness and astigmatism etc. The design of the programme needs to equal the times of the questions asked on the vertical and horizontal directional sight chart. This way, the examination to be precise. 3) The programme can base its next question on the patient’s reaction to the previous one. 4) Patients will then receive a printout of their results. This automated system consists of complementary software and hardware parts. The main control of the hardware circuitry is effected via the keyboard circuit- “8051” controls “8279”, and the software is entirely written in “8051.”
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