Curr Eye Res 2014 Sep 3;39(9):902-7. Epub 2014 Mar 3.
Department of Ophthalmology, RWTH Aachen University , Aachen , Germany.
Purpose: Goldmann applanation tonometry (GAT) is known to be influenced by corneal properties, whereas the effect of corneal edema on intraocular pressure (IOP) measurement using Rebound tonometry (RT) is not clear. In this study, IOP was measured before and after cataract surgery using GAT and RT to investigate differences between methods and the effect of postsurgical corneal edema.
Methods: Thirty patients with cataract were included in a prospective study. IOP was measured using GAT and RT (Icare PRO, Tiolat Oy, Finland) before and after one day of phacoemulsification. Central corneal thickness (CCT) was determined before and after surgery (Pentacam, Oculus, Germany).
Results: CCT increased significantly after surgery by 52.2 ± 35.1 µm (p < 0.0001). IOP values of GAT and RT were significantly correlated before surgery (r = 0.65, p < 0.0001) and after surgery (r = 0.94, p < 0.0001). No significant correlation of GAT and RT to CCT before surgery (GAT: r = 0.18, p = 0.36; RT: r = 0.03, p = 0.87) or after surgery (GAT: r = -0.08, p = 0.69; RT: r = 0.17, p = 0.37) was found. The mean difference between GAT and RT (GAT-RT) was -1.0 ± 2.9 mmHg (range -6.2 to 6.4 mmHg, p = 0.08) before surgery and -1.1 ± 2.2 mmHg (range -5.1 to 4.8 mmHg, p = 0.01) after surgery. Before surgery, a positive correlation of GAT-RT with mean IOP of both methods is apparent (r = 0.45, p = 0.01). After surgery, no such correlation was found (r = -0.08, p = 0.69).
Conclusions: RT underestimates IOP in higher values and overestimates IOP in lower values compared to GAT before surgery. This is not apparent in eyes with corneal edema. Large differences between methods may be present in individual patients with and without corneal edema.
We have submitted your request - we will update you on status within the next 24 hours.
Sign up for further access to Scientific Publications and Authors!
What are PubFacts Points?
PubFacts points are rewards to PubFacts members, which allow you to better promote your profile and articles throughout PubFacts.com
How do I earn PubFacts Points?
Each member is given 50 PubFacts points upon signing up. You can earn additional points by completing 100% of your profile, creating and participating in discussions, and sharing other members research.
What can I do with PubFacts Points?
Currently, you can use PubFacts Points to promote and increase readership of your articles.