Comparison of the topographic ablation zone after photorefractive keratectomy for myopia using two different excimer lasers

J. Ahn, H. Yang, H. M. Lew, Eungkweon Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Purpose To compare the topographic features of eyes treated with photorefractive keratectomy (PRK) for myopia using two different excimer lasers.Methods A total of 65 eyes in 39 patients treated with PRK (6.0-mm optical zone) using Technolas 217C and VISX S4 excimer lasers were evaluated retrospectively to determine the size of the topographic ablation zone.Results The zones ablated using the VISX S4 had shorter diameters in both axes (-0.89±0.73, -1.59±0.49 mm; both P = 0.00), whereas those ablated using the Technolas 217C had a longer diameter in the major axis (0.96±0.63 mm; P = 0.00) and a shorter diameter in the minor axis (-0.39±0.59 mm; P = 0.00). The theoretical ablated zone was a circle with a diameter of 6.0 mm. The Technolas 217C group tended to have oval cuts in comparison with the VISX S4 group, and the difference between the programmed (6.0 mm) and topographic diameters was significant in both groups.Conclusion sThere was a difference between the programmed and postoperative topographic diameters of the ablation zone. The postoperative ablation zone differed in shape and size according to the type of excimer laser.

Original languageEnglish
Pages (from-to)553-557
Number of pages5
JournalEye
Volume24
Issue number4
DOIs
Publication statusPublished - 2010 Jan 1

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Photorefractive Keratectomy
Excimer Lasers
Myopia
Laser

All Science Journal Classification (ASJC) codes

  • Ophthalmology
  • Arts and Humanities(all)

Cite this

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title = "Comparison of the topographic ablation zone after photorefractive keratectomy for myopia using two different excimer lasers",
abstract = "Purpose To compare the topographic features of eyes treated with photorefractive keratectomy (PRK) for myopia using two different excimer lasers.Methods A total of 65 eyes in 39 patients treated with PRK (6.0-mm optical zone) using Technolas 217C and VISX S4 excimer lasers were evaluated retrospectively to determine the size of the topographic ablation zone.Results The zones ablated using the VISX S4 had shorter diameters in both axes (-0.89±0.73, -1.59±0.49 mm; both P = 0.00), whereas those ablated using the Technolas 217C had a longer diameter in the major axis (0.96±0.63 mm; P = 0.00) and a shorter diameter in the minor axis (-0.39±0.59 mm; P = 0.00). The theoretical ablated zone was a circle with a diameter of 6.0 mm. The Technolas 217C group tended to have oval cuts in comparison with the VISX S4 group, and the difference between the programmed (6.0 mm) and topographic diameters was significant in both groups.Conclusion sThere was a difference between the programmed and postoperative topographic diameters of the ablation zone. The postoperative ablation zone differed in shape and size according to the type of excimer laser.",
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Comparison of the topographic ablation zone after photorefractive keratectomy for myopia using two different excimer lasers. / Ahn, J.; Yang, H.; Lew, H. M.; Kim, Eungkweon.

In: Eye, Vol. 24, No. 4, 01.01.2010, p. 553-557.

Research output: Contribution to journalArticle

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