Intraocular Pressure Measurement in Air-filled Eye Following Vitrectomy.
- Author:
Hum CHUNG
1
Author Information
1. Department of Ophthalmology, College of Medicine, Seoul National University, Korea.
- Publication Type:Original Article
- MeSH:
Anterior Chamber;
Intraocular Pressure*;
Manometry;
Operating Tables;
Rabbits;
Transducers;
Vitrectomy*
- From:Journal of the Korean Ophthalmological Society
1988;29(4):573-577
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
Gas tamponade is sometimes necessary after vitrectomy. Accurate measurement of intraocular pressure(IOP) in gas-filled eye is important, but is hard to get in operating table, because of lack of a good measuring device. Schiotz tonometry is the only possible method, but it usually gives a lower value than real, because gas-filled eye has a greater compressibility. But if the Schiotz tonometry can give a consistant value in relation to the real value, one can assume a true IOP by simply converting the value, and it will help the vitrectomy surgeon. Vitrectomy with or without lensectomy were done in 7 pigmented rabbits, and fluidair exchange were done at the end of the surgery. Intraocular pressure was monitored by an air infusion system, and true IOP was measured by a transducer from the anterior chamber. Schiotz tonometry was done ar each 5mmHg IOP level, and the values were compared. Schiotz tonometry always gave a lower pressure, and the discrepancy seemed to be greater in aphakic eye, and when the heavier plunger weight were used. Conversion equation was suggested, and their reliability was discussed.
