The clinical use of prisms; and the decentering of lenses (1893)
Maddox, Ernest Edmund, 1860-1933 · Bristol : J. Wright ; London : Simpkin, Marshall, Hamilton, Kent · leaf 64
qually dis-tributed over both eyes, as in the apparatus sketchedin Fig. 25, where one prism revolves in front ofeach eye. This apparatus would only be of use fortesting convergence and divergence. To use it, wewould start with both prisms, apex upwards, androtate the apices towards, or away from,… … Fig. 25.—Proposed rotary prismatic trial frame with prismsbefore both eyes. be produced by prisms with their apices inwards oroutwards. In the following table I have shewnhow much each prism needs to be rotated to give 4 5° PRISMS the horizontal effect of i°d, 2°d, etc., supposing thestrength of…
Lenses
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