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The Measuremant of Intraocular Pressure in Eyes with Keratoconus Using Pascal Dynamic Contour Tonometer - Original Article
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Original Article
VOLUME: 38 ISSUE: 3
P: 185-190
May 2008

The Measuremant of Intraocular Pressure in Eyes with Keratoconus Using Pascal Dynamic Contour Tonometer - Original Article

Turk J Ophthalmol 2008;38(3):185-190
Özcan Ocakoğlu
Güzin İskeleli
Didar Uçar
1.
No information available.
No information available
Received Date: 11.04.2007
Accepted Date: 15.10.2007
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ABSTRACT

Material and Method:

Our study included 44 eyes of 28 patients which were diagnosed as keratoconus clinically and topographically. Their central corneal thicknesses which were mea-sured with ultrasonographic pachymeter were under 500 microns (^). IOP's were estimated using Pascal DCT, Goldmann applanation tonometer (GAT) and non contact air-puff tonometer (NCT). The "mean" IOP accepted as the mean of three consecutive measurements in different times. The "mean" IOP's values using Pascal DCT, GAT and NCT compared with paired stu-dent t test with each other. Statistically significance limit was p<0,05. Pearson correlation analysis was used to determine the effect of CCT on IOP. Correlation coefficient was accepted r>0,25 (p<0,05).

Results:

The mean age of 28 patients with keratoconus was 30,18±8.8 years. In 44 study eyes, the mean value of CCT's was 465,8±24,1 The mean values of IOP's using Pascal DCT, GAT and NCT were 14,3±2,3 mmHg, 11, 1±2,6 mmHg, 8,11±1,9 mmHg, respectively. The mean IOP using Pascal DCT was statistically higher than the mean values of GAT and NCT (Stu-dent t test; p<0,05). IOP measured with NCT were significantly correlated with CCT (Pearson correlation analysis r1=0,26, p<0,05) but IOP measured with GAT and Pascal DCT were not ef-fected (for GAT r2=0,09; for DKT r3=0,06, p>0,05).

Conclusion:

In eyes with keratoconus, the highest IOP value was measured with Pascal DCT. The measured IOP's using NCT was affected by the changes in CCT but the IOP's measured with Pascal DCT and GAT were not. When the technical problems with using GAT in eyes with keratoconus which was thinned and topographically distrurbed cornea are considered, we thought that to use Pascal DCT is more accurate and safely.

Purpose:

To compare Pascal dynamic contour tonometer (DCT) with other tonometric systems for measurement of intraocular pressure (IOP) in eyes with keratoconus which has thin-ned cornea and topographically indicated keratoconus pattern and to investigate whether central corneal thickness (CCT) affect IOP measurements or not.

Keywords:
Keratoconus, Pascal dynamic contour tonometry, central corneal thickness