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Different modalities in assessment of intraocular pressure after penetrating keratoplasty: a comparative study

Poster Details

First Author: A.Wassef EGYPT

Co Author(s):    K. Mansour   S. Essmat   H. Magdy              

Abstract Details


To compare the obtainability and values of intra ocular pressure (IOP) measurements by Goldmann’s Applanation Tonometry (GAT) and Ocular Response Analyzer (ORA) before and after penetrating keratoplasty (PKP), testing the degree of their agreement and the impact of corneal biomechanical factors on IOP measurement.


Comparative prospective observational study at the Cornea service clinic, Kasralainy Hospital, Cairo University – Egypt.


Forty (40) patients scheduled for penetrating keratoplasty (PKP) were enrolled to undergo intraocular pressure measurement (IOP) using the Ocular Response Analyzer (ORA) then the Goldmann’s applanation tonometer (GAT) one day before surgery to be repeated one month after their surgery. Patients undergoing lamellar keratoplasties as well as those with severe post operative complications were excluded.


40 eyes of 40 patients were included of which 28 were males (70%) and 12 females (30%). Obtainability of ORA (92.5% of the patients) was significantly higher than GAT (60%) postoperatively (p<0.001). The mean cornea compensated IOP (IOPcc) by ORA was significantly higher than GAT both pre (14.44 ± 7.03, 11.78 ± 4.55 mmHg respectively) and postoperatively (19.2 ± 8.31, 15.65 ± 6.99 mmHg respectively). Strong correlations existed between GAT and ORA measurements both pre and postoperatively. Unlike GAT, the change in IOPcc (post – pre) didn’t correlate at all with the change in neither CRF (p=0.12) nor CH (p=0.13).


ORA has proven to be superior to GAT in the ability to obtain reliable IOP measurements post PKP. IOPcc measurements by ORA also prooved to be relavant, independent on corneal biomechanical factors (CH and CRF) but judging the accuracy of its values needs further large scale studies.

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