A new model of a small ophthalmoscope / by Walter L. Pyle.

  • Walter L. Pyle
Date:
1899
Catalogue details

Licence: Public Domain Mark

Credit: A new model of a small ophthalmoscope / by Walter L. Pyle. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    // A NEW MODEL OF A SMALL OPHTHALMOSCOPE. By WALTER L. PYLE; M.D. Assistant Surgeon to Wills Eye Hospital, Philadelphia. This instrument consists of two superimposed lens-discs, 34 mm. and 37 mm. in diameter respectively, each contain- ing 14 apertures for lenses. Each disc has independent movement. The inner disc, that is, the one nearest to the observer's eye, contains the high-power lenses, both convex and concave. Its circumference is milled and it is rotated directly by the linger, as in the Loring instrument. The outer disc, that is, the one nearest to the mirror, contains the low-power lenses, both convex and concave. A toothed edge is cut on its circumference, and it is rotated by a lower
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