To the Editor:
—In 2 recent articles,1,2 Bill challenged the validity of values for intrascleral venous pressure reported by me for cat eyes. My values were described as ``artifactual'' and due to "faulty technique."Bill's criticisms may be answered as follows: I pointed out in my first report3 that the values obtained by the occlusion technique increased both the venous and intraocular pressures, and I stated that these paired data did not indicate normal values. The individual values, however, demonstrated a statistically significant (P<.001) linear relationship between these 2 functions. It was apparent to me that if the intraocular pressure was dependent upon the venous pressure, then the above function would be valid even though the absolute values of both pressures had been changed by the technique of venous pressure measurement. In a subsequent publication4 I showed, using a microcannulation technique (which had no apparent effect
Macri FJ. EXPERIMENTAL AQUEOUS HUMOR DRAINAGE. Arch Ophthalmol. 1962;68(1):150–151. doi:10.1001/archopht.1962.00960030154031
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