17 Calculated correction of tonometrically mea
s
ured IOP
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Instruction Manual Myopia Master® (G/68100/EN Rev04 0820)
17.3 IOP correction ba
s
ed on central corneal thickne
ss
and corneal
curvature
The formula developed by Orssengo and Pye considers not only the
corneal thickness but also the corneal curvature in calculating the
corrected IOP.
This yields a factor with which the true IOP can be estimated from the
measured IOP. In contrast to those quoted above this formula includes the
measured IOP as a parameter in calculating the corrected IOP.
It thus involves a larger number of input variables, which according to its
originators permits a more precise estimate of IOP regardless of corneal
thickness.
With this formula the correction factor, or IOP change, is calculated as
follows:
Fig. 17-2: Correction formula
