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To the Editor.–For some time, I have been using a variation of the technique of choroidoscopy, which I have found helpful and would like to share with my colleagues in ophthalmology. I perform choroidoscopy, as demonstrated in my article "Choroidoscopy," (Am J Ophthalmol 51:833-834, 1961) monocularly, ie, without the use of the binocular indirect ophthalmoscope. A condensing lens (+20 or +30 diopters) is held in front of the patient's eye to be examined, and a real, inverted serial image is displayed in front of the lens by an intense "cold" fiberoptics transilluminating light (tungsten-halogen or xenon-arc lamp source), which is held firmly against the lateral canthus of the eye. I then view this image by placing a strong convex lens (eg, +8, +10, +15, +20 D) over my spectacles (right or left eye, whichever one prefers) and move in close to the aerial image until it is in sharp
Cohen SW. Technique of Choroidoscopy. Arch Ophthalmol. 1977;95(12):2230-2231. doi:10.1001/archopht.1977.04450120136024