The clinical use of prisms : and the decentering of lenses / by Ernest E. Maddox.

  • Maddox, Ernest E. (Ernest Edmund), 1860-1933.
Date:
1907
Catalogue details

Licence: In copyright

Credit: The clinical use of prisms : and the decentering of lenses / by Ernest E. Maddox. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    other rim of the frame, and the observation repeated for the other eye. By this method we comply with the two afore- named conditions of accuracy ; the visual lines of the observing and observed eyes coincide, and of necessity they are both at right angles to the trial-frame. The frame must, of course, be one movable by a screw, and marked in millimetres, so that the record can be read off after localizing Fig. 65.—Localizer for Ophthalmoscopic Reflection. (Present edition). each pupil. The distance of the centre of each eye from the middle line is in each case half what is registered by the frame. The careful use of this instrument will show how many an un- suspected difference exists in the position of the two eyes. Though for most clinical work it suffices to know the positions of the pupils, it has been shown elsewhere that the corneal reflection of an ophthalmoscope, at the sight hole of which the patient is^directed to gaze, affords the most