Intraoperative pachymetry during excimer photorefractive keratectomy.

Z. Z. Nagy, I. Süveges, J. Németh

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The evaluation of pre- and intraoperative corneal thickness is of great importance in photorefractive surgery and in planning phototherapeutic treatments. The authors evaluated 14 eyes with Humphrey ultrasonic pachymeter Model 855 during photorefractive keratactomies (PTK). All treatments were performed with the Aesculap Meditec MEL 60 ArF excimer laser. The preoperative uncorrected visual acuity averaged 0.078 +/- 0.068. The average of preoperative correction used to obtain the best corrected visual acuity was: -6.11 +/- 3.70. The average preoperative corneal thickness was found at 548.14 +/- +/- 24.58 microns; the average thickness of the mechanically removed epithelium was: 51.5 +/- 1.49 microns. After PRK the corneal thickness decreased to 440.78 +/- 33.2 microns. The thickness of the photoablated corneal tissue was on the average 55.86 microns measured by the ultrasound pachymeter. The pachymeter values correlated well with the average of 53.21 +/- 30.19 microns thickness change calculated by the excimer laser combi modul display monitor. The authors conclude, that ultrasound pachymeter is suitable for evaluating pre- and intra-operative corneal thickness. Echobiometric pachymetry is valuable in planning and executing phototherapeutic treatment. It permits the surgeon to assess intraoperatively the thickness of the already ablated corneal tissue and reduce the risk of postoperative refractive changes. The method is also suitable for controlling the photorefractive calibration of the excimer laser.

Original languageEnglish
Pages (from-to)217-223
Number of pages7
JournalActa Chirurgica Hungarica
Volume35
Issue number3-4
Publication statusPublished - 1995

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Photorefractive Keratectomy
Excimer Lasers
Visual Acuity
Ultrasonics
Calibration
Therapeutics
Epithelium

ASJC Scopus subject areas

  • Surgery

Cite this

Intraoperative pachymetry during excimer photorefractive keratectomy. / Nagy, Z. Z.; Süveges, I.; Németh, J.

In: Acta Chirurgica Hungarica, Vol. 35, No. 3-4, 1995, p. 217-223.

Research output: Contribution to journalArticle

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