Originally Posted by
finefocus
Let me try to answer the question as asked. The effect of a viewing angle downward toward the reading area, in a lens angled retroscopicly, would be to foreshorten the corridor. To visualize this, take any lens, draw a vertical inkline on it, and hold it unangled an inch or two in front of your eye. Now tilt it retroscopicly. The line (and the corridor) apparently get shorter as the angle increases. Use a longer corridor, and fit it as high as the patient can possibly stand when (for example) driving.
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