Purpose. To evaluate the intraocular pressure (IOP) increase induced by 12 devices with vacuum fixation (RK vacuum ring, Hanna and Hessburg-Baron comeal trephines, corneal dehydrator, photocoagulation lenses, transcorneal iontophoresis electrodes, and LASIK microkeratome). Methods. Fresh Eye Bank eyes were placed in an artificial orbit maintaining the extraocular pressure (EOF) at 5 mmHg. The IOP was monitored (Ophthalmic Surgery 18:371-374, 1987). We studied the variations of IOP and EOP induced by each device as a function of vacuum pressure, initial IOP, weight, diameter, and position on the globe of the fixation device, and the donor age. Results. The IOP was significantly increased by the vacuum fixation devices. There was no significant influence of either initial IOP or EOP on the IOP increase, which was slightly dependent on the donor age. We found a significant effect of the vacuum pressure, size, position, and weight of the fixation device on IOP, EOP and on the increase in IOP. The average IOP increase was I7+/-7 mmHg for 60 mmHg of vacuum, 37+/-10mmHg for 150 mmHg, 49+/-12 mmHg for 210 mmHg and 85+/-15 mmHg for 470 mmHg. Conclusions. Vacuum fixation devices may cause a significant increase in IOP. Patient preoperative evaluation should highlight clinical history of glauComa or vascular disease.
|Original language||English (US)|
|Journal||Investigative Ophthalmology and Visual Science|
|State||Published - Dec 1 1997|
ASJC Scopus subject areas
- Sensory Systems
- Cellular and Molecular Neuroscience