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Related Experiment Videos

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

Shehzad A Naroo1, W Neil Charman

  • 1Department of Optometry and Neuroscience, UMIST, Manchester, United Kingdom. s.a.naroo@aston.ac.uk

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|June 28, 2005
PubMed
Summary

Surface roughness from some excimer laser systems can reduce visual performance. This study found that increased roughness on polymethylmethacrylate (PMMA) lenses correlated with decreased contrast sensitivity and visual acuity.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Materials Science

Background:

  • Excimer laser systems are widely used for refractive surgery.
  • The quality of the laser-produced surface can impact optical performance.
  • Polymethylmethacrylate (PMMA) is a common material for intraocular lenses and other optical applications.

Purpose of the Study:

  • To investigate if surface quality limitations from a specific excimer laser system (Nidek EC-5000) can negatively affect visual performance.
  • To assess the relationship between laser-ablated surface roughness and visual function using a PMMA model.

Main Methods:

  • Lenses of varying powers were ablated on PMMA sheets using five Nidek EC-5000 excimer laser systems.
  • Surface roughness was objectively measured using profilometry.

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  • Visual acuity and contrast sensitivity were evaluated through the ablated lenses.

    • Main Results:

    • Surface roughness increased with lens power, with higher roughness observed for negative lenses compared to positive lenses.
    • Decreases in contrast sensitivity and visual acuity mirrored the pattern of increasing surface roughness.
    • The observed effects on visual performance were consistent with previous findings from other excimer laser systems.

    Conclusions:

    • The surface roughness generated by certain excimer laser systems can be significant enough to impair visual performance.
    • Careful consideration of laser system performance and surface quality is crucial for maintaining optimal visual outcomes.