Surface roughness after excimer laser ablation using a PMMA model: profilometry and effects on vision

Shehzad A. Naroo*, W. Neil Charman

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

PURPOSE: To show that the limited quality of surfaces produced by one model of excimer laser systems can degrade visual performance with a polymethylmethacrylate (PMMA) model. METHODS: A range of lenses of different powers was ablated in PMMA sheets using five DOS-based Nidek EC-5000 laser systems (Nidek Technologies, Gamagori, Japan) from different clinics. Surface quality was objectively assessed using profilometry. Contrast sensitivity and visual acuity were measured through the lenses when their powers were neutralized with suitable spectacle trial lenses. RESULTS: Average surface roughness was found to increase with lens power, roughness values being higher for negative lenses than for positive lenses. Losses in visual contrast sensitivity and acuity measured in two subjects were found to follow a similar pattern. Findings are similar to those previously published with other excimer laser systems. CONCLUSIONS: Levels of surface roughness produced by some laser systems may be sufficient to degrade visual performance under some circumstances.

Original languageEnglish
Pages (from-to)260-268
Number of pages9
JournalJournal of Refractive Surgery
Volume21
Issue number3
DOIs
Publication statusPublished - May 2005

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Excimer Lasers
Laser Therapy
Polymethyl Methacrylate
Lenses
Contrast Sensitivity
Lasers
Visual Acuity
Japan
Technology

Cite this

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title = "Surface roughness after excimer laser ablation using a PMMA model: profilometry and effects on vision",
abstract = "PURPOSE: To show that the limited quality of surfaces produced by one model of excimer laser systems can degrade visual performance with a polymethylmethacrylate (PMMA) model. METHODS: A range of lenses of different powers was ablated in PMMA sheets using five DOS-based Nidek EC-5000 laser systems (Nidek Technologies, Gamagori, Japan) from different clinics. Surface quality was objectively assessed using profilometry. Contrast sensitivity and visual acuity were measured through the lenses when their powers were neutralized with suitable spectacle trial lenses. RESULTS: Average surface roughness was found to increase with lens power, roughness values being higher for negative lenses than for positive lenses. Losses in visual contrast sensitivity and acuity measured in two subjects were found to follow a similar pattern. Findings are similar to those previously published with other excimer laser systems. CONCLUSIONS: Levels of surface roughness produced by some laser systems may be sufficient to degrade visual performance under some circumstances.",
author = "Naroo, {Shehzad A.} and Charman, {W. Neil}",
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Surface roughness after excimer laser ablation using a PMMA model : profilometry and effects on vision. / Naroo, Shehzad A.; Charman, W. Neil.

In: Journal of Refractive Surgery , Vol. 21, No. 3, 05.2005, p. 260-268.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Surface roughness after excimer laser ablation using a PMMA model

T2 - profilometry and effects on vision

AU - Naroo, Shehzad A.

AU - Charman, W. Neil

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AB - PURPOSE: To show that the limited quality of surfaces produced by one model of excimer laser systems can degrade visual performance with a polymethylmethacrylate (PMMA) model. METHODS: A range of lenses of different powers was ablated in PMMA sheets using five DOS-based Nidek EC-5000 laser systems (Nidek Technologies, Gamagori, Japan) from different clinics. Surface quality was objectively assessed using profilometry. Contrast sensitivity and visual acuity were measured through the lenses when their powers were neutralized with suitable spectacle trial lenses. RESULTS: Average surface roughness was found to increase with lens power, roughness values being higher for negative lenses than for positive lenses. Losses in visual contrast sensitivity and acuity measured in two subjects were found to follow a similar pattern. Findings are similar to those previously published with other excimer laser systems. CONCLUSIONS: Levels of surface roughness produced by some laser systems may be sufficient to degrade visual performance under some circumstances.

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