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Comparative Surface Imaging Study of Multifocal Diffractive Intraocular Lenses.

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Summary

Surface topography analysis revealed distinct differences between multifocal intraocular lenses (IOLs). The Tecnis Symfony IOL exhibited unique, highly ordered surface structures and statistically significant higher roughness compared to other models.

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Area of Science:

  • Ophthalmic biomaterials
  • Surface metrology
  • Intraocular lens technology

Background:

  • Multifocal intraocular lenses (IOLs) are crucial for restoring vision after cataract surgery.
  • Surface topography and roughness of diffractive multifocal IOLs can influence optical performance and patient outcomes.
  • Understanding these microstructural differences is essential for IOL design and selection.

Purpose of the Study:

  • To compare the surface topography and roughness of three distinct diffractive multifocal IOL models.
  • To analyze specific topographical features of the AcrySof IQ PanOptix, AT LARA 829MP, and Tecnis Symfony IOLs.

Main Methods:

  • Utilized scanning electron microscopy (SEM) and atomic force microscopy (AFM) for high-resolution surface analysis.
  • Examined three representative areas: central non-diffractive optic, central diffractive optic, and diffractive step.
  • Quantified surface roughness using mean arithmetic roughness (Ra) and root-mean-squared roughness (Rq) values, with statistical comparison.

Main Results:

  • All IOLs presented smooth surfaces at low magnification.
  • Tecnis Symfony IOL displayed unique, highly regular, concentric, and lineate structures on its diffractive surface.
  • Tecnis Symfony showed statistically significant higher Ra and Rq values compared to the other IOLs (p < 0.05).

Conclusions:

  • Significant topographical variations exist among the studied diffractive multifocal IOLs.
  • While all Ra values were within acceptable limits, Tecnis Symfony demonstrated notably higher roughness in critical areas.
  • The distinct, ordered surface pattern of Tecnis Symfony differentiates it from the other analyzed IOLs.