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To the Editor:
—The paper of Hill, Lopez, and Hill entitled, "Effect of Retrobulbar Anesthesia Upon Intraocular Pressure" (Arch Ophthal [Chicago] 70: 178-180, 1963). It is gratifying to have other ophthalmologists emphasize the importance of checking the tension with a tonometer before making a section for cataract extraction. For 15 years I have used the tonometer routinely before making the section and prior to that a hook or blunt instrument to indent the globe as has been advocated for years. Having used both methods for many years, I am convinced that using the tonometer has decided advantages. If a tonometric reading has been decided upon as a safe limit then, if a higher tension is recorded, it acts as a more positive deterrent for beginning the operation before the eye is soft.The amount of hypotony desired varies with different surgeons, 10 mm of mercury or below with the Schiotz
Atkinson WS. TONOMETRY BEFORE CATARACT EXTRACTION. Arch Ophthalmol. 1964;71(2):293-294. doi:10.1001/archopht.1964.00970010309037