TY - JOUR
T1 - The effect of contact lens-induced corneal edema on Goldmann applanation tonometry and dynamic contour tonometry
AU - Oh, Jong Hyun
AU - Yoo, Chungkwon
AU - Kim, Yong Yeon
AU - Kim, Hyo Myung
AU - Song, Jong Suk
PY - 2009
Y1 - 2009
N2 - Purpose: To evaluate the effect of contact lens-induced corneal edema on intraocular pressure (IOP) measurements using Goldmann applanation tonometry (GAT) and dynamic contour tonometry (DCT) in Asian subjects. Participants: The study included 40 eyes of 20 normal volunteers with no evidence of ocular disease. Methods: Forty eyes of 20 healthy volunteers were required to wear soft contact lenses for 2 hours to induce corneal swelling. Central corneal thickness (CCT) and IOP were measured before and immediately after contact lens wear using specular microscope, GAT, and DCT. The IOP measurements by GAT and DCT were compared. The changes in the CCT and the IOP measurements after wearing contact lenses were assessed. Results: The mean CCT of the 40 eyes evaluated was 532.6±31.6 μm. The mean IOP was 11.78±2.04 mmHg for the GAT and 14.46±1.89 mmHg for the DCT, and the difference was statistically significant (P<0.001). After wearing contact lenses, the mean CCT was 553.2±34.3 μm, which was 20.6±12.9 μm greater than before wearing them (P<0.001). The mean IOP measurements of the GAT and DCT were decreased after wearing the contact lenses. The mean decrease of the GAT values was 0.43±1.95 mmHg, which was not statistically significant (P=0.175). However, the mean decrease of the DCT readings, which was 0.75±1.74 mm Hg, was statistically significant (P=0.010). Conclusion: The IOP measurements with DCT were significantly higher than those with GAT in healthy Asian eyes. Although the mean IOP measurements of both the GAT and the DCT were decreased in the edematous cornea, IOP measurements of the DCT were more affected by corneal edema than were the GAT.
AB - Purpose: To evaluate the effect of contact lens-induced corneal edema on intraocular pressure (IOP) measurements using Goldmann applanation tonometry (GAT) and dynamic contour tonometry (DCT) in Asian subjects. Participants: The study included 40 eyes of 20 normal volunteers with no evidence of ocular disease. Methods: Forty eyes of 20 healthy volunteers were required to wear soft contact lenses for 2 hours to induce corneal swelling. Central corneal thickness (CCT) and IOP were measured before and immediately after contact lens wear using specular microscope, GAT, and DCT. The IOP measurements by GAT and DCT were compared. The changes in the CCT and the IOP measurements after wearing contact lenses were assessed. Results: The mean CCT of the 40 eyes evaluated was 532.6±31.6 μm. The mean IOP was 11.78±2.04 mmHg for the GAT and 14.46±1.89 mmHg for the DCT, and the difference was statistically significant (P<0.001). After wearing contact lenses, the mean CCT was 553.2±34.3 μm, which was 20.6±12.9 μm greater than before wearing them (P<0.001). The mean IOP measurements of the GAT and DCT were decreased after wearing the contact lenses. The mean decrease of the GAT values was 0.43±1.95 mmHg, which was not statistically significant (P=0.175). However, the mean decrease of the DCT readings, which was 0.75±1.74 mm Hg, was statistically significant (P=0.010). Conclusion: The IOP measurements with DCT were significantly higher than those with GAT in healthy Asian eyes. Although the mean IOP measurements of both the GAT and the DCT were decreased in the edematous cornea, IOP measurements of the DCT were more affected by corneal edema than were the GAT.
KW - Corneal edema
KW - Dynamic contour tonometry
KW - Goldmann applanation tonometry
KW - Intraocular pressure
UR - http://www.scopus.com/inward/record.url?scp=59749092485&partnerID=8YFLogxK
U2 - 10.1007/s00417-008-0954-9
DO - 10.1007/s00417-008-0954-9
M3 - Article
C2 - 18843499
AN - SCOPUS:59749092485
SN - 0721-832X
VL - 247
SP - 371
EP - 375
JO - Graefe's Archive for Clinical and Experimental Ophthalmology
JF - Graefe's Archive for Clinical and Experimental Ophthalmology
IS - 3
ER -