Image from page 95 of "The commoner diseases of the eye : how to detect and how to treat them" (1904)
Subjects: Eye -- Diseases and defects
Publisher: Chicago : G.P. Engelhard & Company
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive
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Text Appearing Before Image:
The Morton Ophthalmoscope.a series of concave and convex lenses to neutral- 90 COMMONER DISEASES OF THE EYE ize both the patients and the observers refract-ive errors, so that the background of the eyecan be clearly seen. In the first instance, after a careful inspectionof the anterior parts of the eye, both without andwith a lens and focal illumination, he should,holding the instrument against his own eyebrowwith one hand and a -J-20D glass with the other
Text Appearing After Image:
The Indirect Method of Using the Ophthalmoscope. hand, focus the reflected light (from the con-cave mirror of the ophthalmoscope at a distanceof about 40 cm. or 18 inches) upon the fundusthrough the (dilated) pupil. He will do this the more readily if a -f-4°llens be placed in front of the eyehole of themirror. This is the indirect method, which AMETROPIA. FITTING OF GLASSES.—OPHTHALMOSCOPE 91 gives an inverted image of the ocular fundusand an outline picture. It corresponds to thelow power lens which we use in the preliminaryexamination of a microscopical section.
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