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Amit Sobti, Tarun Arora, Saptorishi Majumdar, Anita Panda, Tanuj Dada; Evaluation Of Intraocular Pressure Measurements Using Tono-pen Avia In Central And Peripheral Part Of The Cornea Of Healthy And Glaucoma Patients. Invest. Ophthalmol. Vis. Sci. 2011;52(14):674.
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To evaluate the difference in the central and peripheral (nasal & temporal) limbus intraocular pressure (IOP) measurements by using TONO-PEN AVIA tonometer in normal and glaucoma patients.
IOPs of 32 healthy subjects and 32 consecutive glaucoma patients presenting to the outpatient department of our tertiary care institute were measured using TONO-PEN AVIA at the center of the cornea and at 2 mm distance from the nasal and temporal limbus along the horizontal meridian. The device displayed the average of 10 independent readings. Agreement between central and peripheral IOP measurements was evaluated.
Mean age of the normal individuals was 39.2 + 14.89 yrs, amongst which 58.4 % were males. The mean central IOP was 16.05 + 3.35 mmHg and the mean temporal & nasal limbal IOPs were 17.16 + 3.77 & 17.10 + 3.52 mmHg respectively. Nasal limbal pressures were in closer agreement with central pressures, than the temporal one (ICC= 0.753 vs 0.707). The nasal & temporal IOP were also in close agreement (ICC=0.746). Mean age of glaucoma patients was 43.2 + 15.32 yrs, amongst which 52.3 % were males. The mean central IOP was 24.06 + 1.91 mmHg and mean temporal and nasal limbal IOPs were 26.12 + 2.06 mmHg & 25.62 + 2.12 mmHg respectively. Nasal limbal pressures were in closer agreement with central pressures, than the temporal one (ICC= 0.956 vs 0.893). The nasal & temporal IOP were also in close agreement (ICC=0.924)
Limbal IOP may need to be recorded in eyes with central corneal scarring. While either of the limbus may be used, nasal limbal recording of IOP may be a more reliable indicator of the true IOP.
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