No difference in IOP readings taken before and after LASIK surgery was found (whereas applanation tonometers produce false low readings upon surgical modification of the cornea). (Kaufmann C, Bachmann LM, Thiel MA, IOVS 2003, 44: 3790).

Excellent correspondence of IOP measurements taken with the PASCAL device and manometric, intra-cameral pressure measurement has been demonstrated. Measurements on a cadaver eye model were found to be invariant to changes in CCT, whereas GAT and pneumatonometry exhibited a linear dependence on CCT. (Kniestedt C, Nee MT, Stamper RL  ARVO posters No. B464, B480; ARVO 2003).

Measurements with the PASCAL showed a good concordance with the reference IOP. Corneal thickness and curvature showed no clinically relevant effect on measurements with the PASCAL. Measurements with the PASCAL seem to reflect the actual IOP. (In-vivo Direct Manometric IOP Measurement: The Ultimate Reference for Tonometry, ASCRS 2006, Boehm AG, Spoerl E and Pillunet LE, Dept. of Ophthalmology, Dresden, Germany )

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