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Spherical aberration and higher order aberrations with Balafilcon A (PureVision) and Comfilcon A (Biofinity)

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Abstract

Background

Advances in the optical design of soft contact lenses have seen certain manufacturers incorporate aspheric optics into soft lenses in an attempt to reduce spherical aberration, to provide superior visual performance. The aim of this study is to determine the on-eye differences in spherical aberration and higher order aberrations (HOA) between the Bausch and Lomb PureVision (Balafilcon A) and the CooperVision Biofinity (Comfilcon A).

Methods

Twenty subjects were recruited in a prospective, randomized, unilateral study. The right eye was dilated and HOA measured with the NIDEK OPD-Scan. Each eye was fitted randomly with a −3.00D PureVision and a −3.00D Biofinity, and HOA were measured with lenses in situ across a 6 mm pupil. Paired t-tests were performed to determine HOA differences with the lenses in situ compared to baseline.

Results

Aberrometry was successfully performed on all subjects. Statistical analysis indicated no changes in spherical aberration, but changes in other HOA. With the PureVision, there were increases in Zernike terms Z 13 (from 0.01 μm to −0.11 μm), Z -24 (from 0.01 μm to 0.13 μm) and Z -15 (from −0.01 μm to 0.03 μm). With the Biofinity there was an increase in Zernike term Z 33 (from 0.00 μm to 0.09 μm).

Conclusions

No statistically significant changes occurred in spherical aberration. The PureVision caused statistically significant increases in Z 13 , Z -24 and Z -15 , and the Biofinity caused an increase in Z 33 . Clinically significant changes (>0.1 μm) occurred with terms Z 13 and Z -24 with the PureVision only.

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Acknowledgements

The authors would like to thank Professor Edward Goodall, Department of Statistics and Operational Research, School of Mathematics and Physics, The Queen's University of Belfast, Belfast, Northern Ireland, UK for his statistical advice in this study.

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Authors and Affiliations

  1. School of Biomedical Sciences, University of Ulster, Cromore Road, Coleraine, BT52 1SA, UK

    Colm McAlinden, Victoria E. McGilligan & Tara C. B. Moore

  2. Cathedral Eye Clinic, University of Ulster, 25-51 York Street, Belfast, BT15 1ED, UK

    Colm McAlinden & Jonathan E. Moore

  3. Mater Hospital, Belfast Health and Social Care Trust, Belfast, UK

    Jonathan E. Moore

Authors
  1. Colm McAlinden
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  2. Jonathan E. Moore
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  3. Victoria E. McGilligan
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  4. Tara C. B. Moore
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Correspondence to Colm McAlinden.

Additional information

The authors have no financial interest in any of the products mentioned in the manuscript. The corresponding author has full control of all primary data, and we agree to allow Graefe's Archive for Clinical and Experimental Ophthalmology to review data upon request.

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McAlinden, C., Moore, J.E., McGilligan, V.E. et al. Spherical aberration and higher order aberrations with Balafilcon A (PureVision) and Comfilcon A (Biofinity). Graefes Arch Clin Exp Ophthalmol 249, 607–612 (2011). https://doi.org/10.1007/s00417-010-1476-9

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  • DOI: https://doi.org/10.1007/s00417-010-1476-9

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