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Intraocular pressure and the intrastromal corneal ring
A L Kreisberg1, N Bacilious, P A Asbell
1Department of Ophthalmology, Mount Sinai School of Medicine, New York, NY 10029.
Refractive & Corneal Surgery
|July 1, 1991
Summary
Intrastromal corneal rings, used for vision correction, do not significantly alter intraocular pressure (IOP) after implantation. This study found no significant changes in IOP in both ex vivo and in vivo models following ring placement.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Refractive Surgery
Background:
- Intrastromal corneal rings are devices implanted in the cornea for refractive error correction.
- Potential effects of these rings on intraocular pressure (IOP) require investigation.
Purpose of the Study:
- To assess if IOP can be accurately measured with an intrastromal corneal ring in place.
- To determine if intrastromal corneal ring implantation alters IOP.
Main Methods:
- Ex vivo study using 15 eye bank eyes connected to a manometric device to control and measure IOP before and after ring implantation.
- In vivo study involving implantation of the ring in 10 rabbit eyes with IOP measurements taken pre- and post-surgery.
- Tonography was used to calculate facility of outflow.
Main Results:
- No significant difference in IOP was observed pre- vs. post-surgery in the ex vivo model.
- In the in vivo rabbit eye model, no significant IOP changes were detected at 24 and 48 hours postoperatively.
- Facility of outflow showed no significant alteration after ring implantation.
Conclusions:
- Intrastromal corneal ring implantation does not significantly affect intraocular pressure.
- Accurate IOP measurement is feasible with intrastromal corneal rings in place.
- These findings support the safety of intrastromal corneal rings regarding IOP.