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Comparing intraocular pressure measurements in vitrectomized eyes given C3F8 tamponade or air using different tonometries

Poster Details

First Author: Z.Yazar TURKEY

Co Author(s):    M. Önen   Y. Atalay   H.Y. Sarıkatipoğlu            0   0 0   0 0   0 0   0 0

Abstract Details


The purpose of this study is to compare introcular pressure measurements in eyes which underwent 25-gauge transconjonktival sutureless vitrectomy(TCSV) with C3F8 or air using Goldmann applanation tonometry (GAT) or non-contact pneumotonometry (PT).


Ankara Numune Education and Research Hospital, Department of Ophthalmology, Ankara, TURKEY


A total of 30 patients’ 30 eyes that underwent TCSV with 12% C3F8 or air for different vitreoretinal pathologies were enrolled prospectively. Children,dejenerative myopic patients and patients that had corneal pathologies or glaucoma surgery were excluded. IOP values at baseline and 24 hours after the surgery were measured using Goldmann applanation tonometry and non-contact pneumotometry consecutively. The IOP values measured by GAT were corrected considering the corneal thickness assessed by pachimetry.


The mean age of the patients was 59 ±14 (36-80) years. The average IOP measured with PT (19.4±9.0 mmHg) was significantly higher than the average IOP measured with GAT (15.8±6.1 mmHg) (P< 0.05). Especially at higher values (>25 mmHg), the difference between two methods was evident. Using GAT, The mean IOP in eyes given C3F8 tamponade and air was 16.8±2.1 mmHg and 14.1±2.3 mmHg respectively. Using PT, the mean IOP in eyes given C3F8 tamponade and air was 22.±1.8 mmHg and 15.9±3.1 mmHg respectively. There was no correlation between the IOP values and the type of the tamponade(C3F8 or air) (p>0.05). Tamponade filling the eye fully or partially was also not relevant with the IOP levels (p>0.05).


In vitrectomized eyes given C3F8 or air as tamponade, IOP values measured with non-contact pneumotonometry was significantly higher than the IOP levels measured with Goldmann applanation tonometry. This difference was even more evident in higher IOP values. Postoperatively, especially in short terms this difference needs to be taken into consideration.

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