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To the Editor.
—I read with interest the article on clinical evaluation of the AO applanometer which appeared in the May 1967 issue of the Archives (77:646). We have recently purchased an AO applanometer for use in our department at the Palo Alto Medical Clinic and I have attempted to use this. I do find, as the authors suggested, that the vertical alignment of this applanometer is quite critical and that it is very difficult to get both circles to appear at the same time, so much so that one finds oneself continually changing the vertical adjustment in order to get a good reading. Fortunately, in other rooms of our department we do have the Goldmann applanation tonometer, and the plexiglass prism-containing device which goes with this tonometer is supplied in duplicate with each tonometer. Also, fortunately, this device fits neatly into the carrier of the AO applanometer.
Ballin N. CLINICAL EVALUATION OF THE AO APPLANATION TONOMETER. Arch Ophthalmol. 1967;78(4):564. doi:10.1001/archopht.1967.00980030566027
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