advertisement
Abstract #3460 Published in IGR 4-2
Reliability of proton and goldmann applanation tonometers in normal and postkeratoplasty eyes
Pandav SS; Sharma A; Gupta A; Sharma SK; Patnaik BOphthalmology 2002; 109: 979-984
OBJECTIVE: To compare the reliability of intraocular pressure (IOP) measurements with the ProTon tonometer and the Goldmann applanation tonometer (GAT) in normal and post-penetrating keratoplasty (post-PK) eyes. DESIGN: Prospective, nonrandomized, comparative case series. PARTICIPANTS: Twenty-four individuals (48 eyes) with no known ocular disorder and 59 patients (59 eyes) that had undergone penetrating keratoplasty (PK) were included in the normal and post-PK groups, respectively. METHODS: Three readings at five-minute intervals each were obtained with GAT and ProTon in both the groups. Each reading with ProTon was a mean of five accepted readings with the highest accuracy (standard error of mean, < 0.5 mmHg). In post-PK eyes with more than 3.00 D of astigmatism or with irregular astigmatism, the mean of two readings taken with GAT in the steepest and flattest axis was considered to be the IOP. MAIN OUTCOME MEASURES: IOP measurements in all groups were compared using a two-tail paired t test. The coefficient of repeatability and Cronbach's coefficient alpha were calculated separately for the IOP measured using both instruments in each group. RESULTS: There was no significant difference in the second (r1) and third (r2) IOP reading using the GAT and ProTon tonometers in normal and post-PK eyes. The coefficients of repeatability for GAT and ProTon were 2.64 and 2.49 in normal versus 3.72 and 3.47 in the post-PK group. The Cronbach's alpha for GAT and ProTon was 0.94 and 0.95 in the normal group versus 0.95 for both GAT and ProTon in the post-PK group. CONCLUSIONS: The results of our study show that the ProTon tonometer is reliable and comparable with GAT for recording IOP in normal and post-PK eyes.
Dr. S.S. Pandav, Department of Ophthalmology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
