The American journal of the medical sciences (1827)
[Thorofare, N.J., etc.] Charles B. Slack [etc.] · leaf 88
, now, instead of increasing the convergence by turning the angle of the prisms inwards, we lessen it by placing the angle outwards, a result identical in kind follows, only the optical axes intersect further from the eye, and the relative accommodation is likewise removed and the propor- tions… … the optical axes are rendered parallel by prisms, the united angles of which amount to 15°, consequently those were used whose united angles amounted to 5°, 10°, and 15°, instead of as in the former case, 10, 20, 30. It will be seen that just as o was, in Fig. 1, always within the nega-
Medicine
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