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To the Editor:
—In the September 1953 issue of the Archives, page 357, Dr. Robert S. Rosner describes his "Lens Refraction Tree."The principle of the double lorgnette for refraction was described by me in a paper entitled "Retinoscopy Simplified" Eye, Ear, Nose & Throat Month. 25:254255 (May 1946). At that time, I advised having two double lorgnettes, one with + and - 0.25 lenses, and a second one, with + and - 0.50 lenses. Since, I have added another one, with + and - 1.00. I think it is not practical to have the crossed cylinder attached to any of these lorgnettes, as the twirling around should be done while the other lenses are before the eye. In that case, the patient may hold the lorgnette, while the examiner holds and twirls the crossed cylinder.
Bab W. LENS REFRACTION TREE. AMA Arch Ophthalmol. 1953;50(6):780. doi:10.1001/archopht.1953.00920030791015
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