J Korean Ophthalmol Soc.  2012 May;53(5):662-667.

Intraocular Pressure Measurement with the Noncontact Tonometer and Rebound Tonometer through Plano Soft Contact Lenses

• Lee CM
• Yu YC

Abstract

PURPOSE
To investigate the accuracy of intraocular pressure (IOP) measurement through a plano soft contact lens (SCL) in situ by a noncontact tonometer (NCT) and a rebound tonometer (RBT).
METHODS
The IOP of 66 eyes of 33 subjects with no ocular pathology was measured by NCT (tonometer CT-80, TOPCON, Japan) and RBT (iCare rebound tonometry(TM), Tiolat Oy, Finland). IOP measurement was repeated through plano SCL (ACUVUE OASYS(R), Johnson & Johnson Vision Care Inc., USA) in situ. Statistical analysis was performed using the paired t-test.
RESULTS
Mean IOP measured by NCT was 13.10 +/- 2.52 mmHg without SCL and 12.95 +/- 2.56 mmHg with SCL. Mean IOP measured by RBT was 14.13 +/- 2.94 mmHg without SCL and 13.84 +/- 2.75 mmHg with SCL. No significant statistical differences were found between IOP measured with and without SCL (p=0.47, p=0.11 respectively).
CONCLUSIONS
Reliable measurement of IOP by NCT and RBT can be achieved through plano SCL.

Keyword

Intraocular pressure; Noncontact tonometer; Rebound tonometer; Soft contact lens

MeSH Terms

Contact Lenses, Hydrophilic
Eye
Intraocular Pressure
Vision, Ocular

Figure

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  Figure 1 Scatter plots showing intraocular pressure measurements with and without contact lens. There are reasonably good linear correlation between the two measurements. Solid line indicates regression line. (A) Noncontact tonometer, (B) Rebound tonometer.

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  Figure 2 Bland & Altman plots showing intraocular pressure measurements with and without contact lens. Most of the dots are within ± 1.96 standard deviation (dashed line) of difference. Solid line indicates the average mean difference, dashed lines delineates the 98% confidence limits of agreement. (A) Noncontact tonometer, (B) Rebound tonometer.

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