a color filter for retinal photography⋆
TRANSCRIPT
NOTES, CASES, INSTRUMENTS 281
liamson-Noble makes a most excellent suggestion; namely, to use the duochrome test, better known here as the bichrome test.2 This paper should be read by every eye physician. Another amplification of the subject, showing how the "balanced"
condition can be maintained throughout the test by means of correcting cross cylinders as well as testing cross cylinders, has been published by the writer.3
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REFERENCES 1 Pascal, J. I. Arch, of Ophth., 1940, Oct. 2 Williamson-Noble. Brit. Jour. Ophth., 1943, Jan. 8 Pascal, J. I. A new approach to cross cylinder tests. New York State Jour. Med., 1943, Feb.
AN ILLUMINATED RETRACTOR FOR EYE OPERATIONS ESPE
CIALLY FOR DETACHMENT OF T H E RETINA*
CONRAD BERENS, M.D. New York
Because of the need for good illumination in operations for detachment of the retina, orbital operations, and operations on the inferior-oblique muscle, an
GROOVED PORT/ON
8 mm. w/£>£ /smm.iOA/G
STRMD/MD FLASHLtOHT
TH/?£/}0
Fig. 1 (Berens). An illuminated plastic retractor.
illuminated retractor has been devised. This may be inserted into a flashlight handle (fig. 1) or attached to a cord and rheostat. The retractor is of plastic material, the handle is 51 mm. long, and the tip 18 mm long by 8 mm. in diameter. The tip forms an angle of 165 degrees with the handle. The tip is concavo-convex to facilitate the manipulation of electrolysis and diathermy tips and needles in the hollowed-out part.
The tip is slightly frosted to project the light onto the scleral surface.
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A COLOR FILTER FOR RETINAL PHOTOGRAPHY*
FERDINAND L. P. KOCH, M.D. New York
It has become necessary for many who use the carbon-arc models of the Zeiss-Nordenson retinal cameras for color delineation of the eyegrounds, to decelerate their activities in this respect because of the relative scarcity of daylight Koda-chrome film in the bantam pack (K828), although those who work with the later nitra-lamp instruments still are able to
* This study was aided by a grant from the Ophthalmological Foundation, Inc. Made by V. Mueller & Company, Chicago, Illinois.
* From the Departments of Ophthalmology of the College of Medicine, New York University and Bellevue Hospital.
282 SOCIETY PROCEEDINGS
obtain the artificial-light Kodachrome (K828A). The latter, perhaps, does not afford quite so true a coloration as does the former but it is adequate. Similar, reasonably true values may be attained with carbon-arc illumination and artificial-light color film if one resorts to the expediency of using an accessory filter.
This may be done inexpensively with the use of a Type A, C4-Harrison filter, which may still be purchased on the open market. One may obtain it in various sizes according to whether the operator
CHICAGO OPHTHALMOLOGICAL SOCIETY
November 16, 1942
DR. LOUIS G. HOFFMAN, president
CLINICAL MEETING
(Presented by the Department of Ophthalmology, University of Illinois)
BILATERAL OPTIC-NERVE ATROPHY ( J U V E
N I L E TABOPARESIS)
DR. MARTHA RUBIN FOLK presented the case of A. K., a 16-year-old boy who, when first seen on September 4, 1912, complained of blurring of vision for a period of four years. Vision was 0.1 in each eye. The pupils were unequal in size, the right measuring 4 mm. and the left 3.5 mm.; the left pupil reacted sluggishly to light. Upon ophthalmoscopic examination, the optic papilla was seen to be pale, with clear margins and narrowing of the vessels. Perimetric study showed concentric contraction of 20 degrees of both visual fields to form and color. Homat-
of the camera wishes to place the filter in front of the objective lens at the patient's end of the photographic tube or to have it reground for placement in the small, removable filter frame that is received into a slot in the stationary vertical tube situated between the shutter housing and the prism-placement grouping just to the rear of the source of illumination. It is not necessary with this device to alter one's amperage and exposure tables.
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ropine refraction revealed an error of R.E. +2.75D. sph. =c= +0.25D. cyl. ax. 180°, vision 0.1; L.E. 4-2.50D. sph., vision 0.1.
The blood Wassermann reaction was 4 + , and 1+ Kahn. Colloidal gold curve of the spinal fluid showed 5321555300.
Diagnosis made by the Department of Neurology was that of central-nervous-system syphilis with the possibility of early taboparesis. Antisyphilitic therapy was instituted.
CONGENITAL ABSENCE OF LEFT PUNCTA
DR. ROOSEVELT BROOKS presented H. B., a man, aged 22 years, who was referred by the Selective Service Board for correction of tearing in the left eye.
On examination, the right eye was found to be entirely normal. The left eye was watery but the conjunctiva was not injected. Complete absence of the puncta above and below was found. No opening of the lacrimal sac could be found in the nose and it was assumed that the sac was also absent.
SOCIETY PROCEEDINGS EDITED BY DR. DONALD T. LYLE