To compare intraocular pressure measurements obtained by recently introduceddynamic contour tonometry (DCT), Goldmann applanation tonometry (GAT), pneumatonometry(PTG), and intracameral manometry in human cadaver eyes.
Sixteen freshly enucleated human cadaver eyes were deepithelializedand dehydrated with dextran. A tube was placed in the anterior chamber andconnected to a transducer and to a bottle system filled with balanced saltsolution. The pressure in the eye was then altered between 5 mm Hg and 58mm Hg. Intraocular pressure measurements were obtained with DCT, GAT, andPTG at each manometric pressure reading.
On average, DCT values measured 0.58 ± 0.70 mm Hg higher thanreal intracameral pressure. The GAT and PGT showed consistently lower values,−4.01 ± 1.76 mm Hg and −5.09 ± 2.61 mm Hg, respectively.At all bottle heights, DCT values were significantly closer to the referencepressure than GAT and PTG (P<.001).
Measurement with DCT provides IOP values significantly closer to truemanometric levels than either GAT or PTG. Further studies are warranted todetermine its reliability in patients and the effect of corneal thickness.