Real-time intraocular pressure changes during keratomileusis

N. Kasetsuwan, R. T. Pangilinan, L. B. Moreira, S. S. Shah, D. Sanchez, S. Schallhorn, P. J. McDonnell

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Purpose. To measure real-time intraocular pressure during keratomileusis using a commercially available microkeratome. Methods. Eight human donor eyes were used. A standard manometer was used to measure intraocular pressure, entering the vitreous cavity through a pars plana incision. The suction ring of a Phoenix Keratek microkeratome was applied to each eye, as in a standard LASIK or ALK procedure, to create a lamellar corneal flap. The pressure of the suction ring was raised to two different levels, 488 and 600 mmHg, and a contact tonometer supplied by the manufacturer was used to test adequacy of intraocular pressure at each level. Intraocular pressure was recorded by the standard manometer, from application of the suction ring through the end of the passage of the microkeratome. Results. Intraocular pressure increased by more than 90 mmHg after application of the suction ring at a pressure of either 488 and 600 mmHg; however, no significant change in intraocular pressure was noted during actual microlathe procedure. Additionally, corneal flaps performed under a suction ring pressure of 488 mmHg were more regular than those under a suction ring pressure of 600 mmHg. Conclusion. Real-time intraocular pressure can be measured during keratomileusis. The results showed that intraocular pressure increased significantly during the procedure; however, large intraocular pressure spikes during microlathing do not occur as has been reported (anecdotally).

Original languageEnglish (US)
Pages (from-to)S418
JournalInvestigative Ophthalmology and Visual Science
Issue number4
StatePublished - 1997
Externally publishedYes

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience


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