Report of the fourth international ophthalmological congress, held in London, August, 1872 / published by a committee composed of G. Critchett [and others] ; the papers arranged, and the text and translations revised by Henry Power.
- Date:
- 1873
Licence: Public Domain Mark
Credit: Report of the fourth international ophthalmological congress, held in London, August, 1872 / published by a committee composed of G. Critchett [and others] ; the papers arranged, and the text and translations revised by Henry Power. Source: Wellcome Collection.
Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.
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![I found no distance at all, and could not at first, judging by sight alone, believe they were intended for 51'. The dots for 16' I counted at 29' = V. = 29/16 11 H' ii 17' ii 17/(4 11 ii 9' ii 9/43 n ii 7' ii 7/8a,- n 23 ii 48 ii 48/2s ii 19 ' ii 17 ii 36 ii 3G/l9-17-15 ii 15 , 131] ii 12 J i ii • 30 ii 80/13j.13 ii HJ] ii 101 ii 18 ii 18/uH 0i-9J ii ii ii 71 ii 12 ii 12/8J to 6 ii °4 ii 6 J It will be thus seen that my V. averages 2/„ varying from say 3G/10 to 47/2j. It may be I am mistaken as to this being not much above average practised emmetropes of my age, thirty-nine years. I hope others may test their vision also, or that of those within their reach. I should say these experiments of this year were made on one of the hot days of our July, the thermometer indicating 90° Fahr. in the shade where I stood, and the direct sun being hardly bearable. I also was not feeling in perfect health, being fatigued by work and the long spell of intense heat. I speak of these points, because I have found that just such would influence the visual acuity. I again noticed the disagreeable strain of both mental and ocular faculties as three years before, explaining to me many a patient’s irritability when undergoing examination. On a New Binocular Ophthalmoscope. By V. SCHROEDERS. Dr. Schroeders stated that Professor Coccius had constructed a binocular ophthalmoscope, which he submitted to his confreres for approval by his hands. The apparatus consists of two parts, of which one is a system of four equal-sided prisms of good flint glass, which are fixed in a small frame of ebony. This prismatic apparatus, since Giraud-Teulon’s discovery of the binocular mirror, has been de-](https://iiif.wellcomecollection.org/image/b21970956_0150.jp2/full/800%2C/0/default.jpg)
