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 74
lacement is obtainedwhen the base-apex line is at right angles to theline looked at, and the displacement becomes lessand less as this position is rotated from till thebase-apex line becomes parallel with the lineviewed, in which position the displacement is nil,or, rather, it appears nilt for, in… … Fig. 29. by the direction in which the rays of light from theobject enter the pupil, it follows that, when viewed * It will be noticed that a long straight line, viewedthrough a prism, held about an inch from the eye, with itsbase-apex line at right angles to it, appears curved, with itsconcavity…
Lenses
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