Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1907)
Prentice, Charles F. (Charles Frederick), b. 1854 · Philadelphia : Keystone · leaf 169
the dis-tance and reading lenses, relatively to each other. It is, of course,customary to have the lower smaller field for reading, as above shown, but,for convenience of easier demonstration, the reader may make the interest-ing experiment of superposing two concave lenses, say — 4.5 D. and —2.5…
Lenses · Prisms (Ophthalmology)
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