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由ICordero著作·被引用6次—Adirectophthalmoscope,orsimplyanophthalmoscope,isahand-heldopticalinstrumentusedtoinspectthefundusorbackoftheeye.

Comm Eye Health Vol. 29 No. 93 2016 pp 17. Published online 01 July 2016.

A direct ophthalmoscope, or simply an ophthalmoscope, is a hand-held optical instrument used to inspect the fundus or back of the eye.

The ophthalmoscope (Figure 1) contains a handle with a rechargeable battery and a head, frequently detachable, that contains a bulb, a set of apertures for the light source, and a set of lenses. The view provided by the ophthalmoscope is monocular, non-stereoscopic (2D), narrow field (5°), and is magnified about 15 times.

Light from a bulb (Figure 2) is reflected at right angles and projected as a spot through the iris of the patient to illuminate the retina. This reflection is achieved using a mirror or prism. The illuminated retina is seen directly by the health professional (th...