Abstract
Purpose: Just before the resection of the lenticule with the microkeratome the IOP should be determined in order to get a correct and controlled cut. According to published data the intended IOP is 60 to 85 mmHg. In this experimental study we present data from trials with fresh enucleated porcine eyes were direct IOP measurement was registered during the cut with different constructed microkeratomes. Scanning electron microscopy was used to determine the quality of the cut in relation to IOP fluctuations. Method: We performed lamellar cuts with 3 different microkeratomes (Universal Keratome, Phoenix Keratek Inc; Automatic Cornea! Shaper, Chiron; Microlameilar Keratome, Eye Tech Inc.) on 48 fresh enucleated porcine eyes. Direct IOP measurement was performed with a Statham manometer during the procedure. Therefore the globe was cannulated and connected to an infusion system via a 3-way stopcock. The quality of the cut was determined by Scanning Electron Microscopy. Results: IOP elevations up to 135mmHg during the cut could be registred for the Chiron Cornea! Shaper. The Eye Tech Microlameilar Keratome showed an IOP rise up to 105 mmHg. IOP elevation was significant higher for the Phoenix Keratome with 360 mmHg. The quality of the cut was related to IOP fluctuations. The acurracy of the cut was higher for automatic keratomes. Conclusions: Unexpected high IOP values could be dangerous especially for risk eyes. The accuracy of the lenticule is higher for automatic keratomes. IOP fluctuations may have negative influence on the quality of the lenticule.
| Original language | English |
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| Pages (from-to) | S418 |
| Journal | Investigative Ophthalmology and Visual Science |
| Volume | 38 |
| Issue number | 4 |
| State | Published - 1997 |
| Externally published | Yes |