. Physiological optics : being an essay contributed to the American encyclopedia of ophthalmology . Fig. 31.—Ophthalmophakometer of permission of G. P. Putnams Sons. reflections from the cornea and the two surfaces of the crystalline atthe same time. The arc can also be rotated about the axis by as muchas thirty degrees. On the arc move several cursors or carrierswhich are fitted with electric lamps properly screened and carrying infront a convex lens for the purpose of concentrating the light on theeye. The carriers are so arranged that carrier A bears one lamp,carrier B bears a
. Physiological optics : being an essay contributed to the American encyclopedia of ophthalmology . Fig. 31.—Ophthalmophakometer of permission of G. P. Putnams Sons. reflections from the cornea and the two surfaces of the crystalline atthe same time. The arc can also be rotated about the axis by as muchas thirty degrees. On the arc move several cursors or carrierswhich are fitted with electric lamps properly screened and carrying infront a convex lens for the purpose of concentrating the light on theeye. The carriers are so arranged that carrier A bears one lamp,carrier B bears an upright bar having two lamps and carrier G hasan upright bar carrying a fixation object. The instrument is shown with the arc horizontal in one of the dia-grams of Fig. 31 and vertical in the second. [The illustrations of Fig. 31 do not carry the letters A, B and C:however, the designation that carrier A bears one lamp, carrier B two 76 PHYSIOLOGICAL OPTICS lamps and carrier C the fixation object should suffice to prevent anyconfusion.]59. Measurement of the angle alpha. The ophthalniophako
Size: 1398px × 1788px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysiologicaloptics
