INTRAOCULAR-PRESSURE MEASUREMENT AFTER PENETRATING KERATOPLASTY - MINIFIED GOLDMANN APPLANATION TONOMETER, PNEUMATONOMETER, AND TONO-PEN VERSUS MANOMETRY

The accuracy of intraocular pressure measurement with the minified Gol dmann applanation tonometer, the pneumatonometer, and the Tone-Pen ton ometer were compared in post-mortem human eyes which had undergone pen etrating keratoplasty. Enucleated postmortem human eyes underwent same sized (7.75 mm) or 0.5 mm oversized (8.25 mm) autologous penetrating keratoplasty. Intraocular pressure was then set and measured manometri cally while being determined successively with each tonometer over the range of 0-65 mm Hg. Linear regression analysis comparing tonometric and manometric readings showed: (1) minified Goldmann applanation tono meter - slope 0.985 and 0.944, intercept 1.64 and 2.55 mm Hg, correlat ion coefficient 0.99 and 0.99 in same sized and oversized grafted eyes respectively; (2) pneumatonometer - slope 1.008 and 0.990, intercept 3.37 and 3.69 mm Hg, correlation coefficient 0.99 and 0.98; (3) Tono-P en-slope 1.061 and 1.002, intercept 5.01 and 4.06 mm Hg, correlation c oefficient 0.97 and 0.98. We concluded that the minified Goldmann appl anation tonometer is as accurate or more accurate than the pneumatonom eter and the Tone-Pen in postmortem post-keratoplasty human eyes, and may be an economical, convenient alternative to the latter two instrum ents in clinical practice.