The velocity of accommodation / by James W. Barrett.

  • Barrett, James W. (James William), Sir, 1862-1945.
Date:
[1885]
Catalogue details

Licence: Public Domain Mark

Credit: The velocity of accommodation / by James W. Barrett. 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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    wearying nature of the repeated efforts to focus soon makes itself evident; and further that a number of accommodations from far to a very near point was followed in two cases by nausea and a most unpleasant nervous disturbance. Gross measurements of the accommodation and relaxation of Case (A), set. 22, Physiologist. Bight eye V = f manifest hypermetropia -25D. Left eye V = f Punctum proximum about 9 cm. I. Accommodation Telocity. (From Far to Near.) Distance From Eight Eye Left Eye Dats to sec. sec. Infinity 33 cm. 1 00 1*76 *T* n,1 Jan. 9th. )L o4 1-761 Jan. 10th. U-34 2-09J lvJo 1-97 Jan. 12th. M9 1-33 Jan. 15th. •98 1-07 Jan. 20th. •906 Jan. 23rd. •67 •72 Jan. 24th. •75 • -77 Feb. 4th. •72 •82 Feb. 7th. Infinity 11 cm. 2-26 2-39 Jan. 10 th. 1-73 1-66 Jan. 20th. 1-62 1-1 Jan. 23rd. Jan. 24th. 1-58 1-5 Feb. 4th. 33 cm. 1-66 1-5 Feb. 7th. 11 cm. M4 1-04 Jan. 23rd. 1-02 1-06 Feb. 4th. 50 cm. 1-45 1-29 Feb. 7th. 16 cm. •98 Jan. 23rd. •9 •88 •93 Jan. 21st. Jan. 24th. •96 •82 Feb. 7 th. II. Relaxation Velocity. (From Near to Far.) 33 cin. Infinity About -7 sec. Varying and difficult to measure, since some days the accommodation could not be completely relaxed, Relaxa- tion velocities for all other distances top rapid for measurement.