The purpose of this investigation was to determine if intraocular pressure measurements made over soft contact lenses are affected by the refractive power of the contact lens and the type of tonometer used. Forty subjects ranging in age from 19 to 45 years, free from corneal abnormalities and glaucoma, participated in this study. Four minus power soft contact lenses, each having the same diameter, base curve, and central thickness, but differing in power (-l.SOD to -6.00D) were chosen. Intraocular pressures were measured over these lenses using two different tonometers, the Tonopen XL and Pulsair 2000. Results showed that intraocular pressure was not affected either by the power of the lens or the type of tonometer used. The differences in mean intraocular pressure with and without lenses were found to be statistically significant. This variability was however clinically acceptable, as the differences were within 1 mm of each other. In conclusion, intraocular pressure measurements taken over standard minus lenses with the Tonopen XL and Pulsair 2000 are reliable and acceptable.
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