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    Effect of cataract surgery incision location and intraocular lens type on ocular aberrations.

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    Publication date
    2005
    Author
    Pesudovs, Konrad
    Dietze, Holger H.
    Stewart, O.
    Noble, B.A.
    Cox, Michael J.
    Keyword
    Acrylic Resins
    Contrast Sensitivity
    Visual Acuity
    Cornea
    Sclera
    Refractive Errors
    Refraction, Ocular
    Polymethyl Methacrylate
    Phacoemulsification
    Lenses, Intraocular
    Lens Implantation, Intraocular
    Corneal Topography
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    Peer-Reviewed
    Yes
    
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    Abstract
    To determine whether Hartmann-Shack wavefront sensing detects differences in optical performance in vivo between poly(methyl methacrylate) (PMMA) and foldable acrylic intraocular lenses (IOLs) and between clear corneal and scleral tunnel incisions and whether optical differences are manifested as differences in visual performance. SETTING: Department of Optometry, University of Bradford, West Yorkshire, United Kingdom. METHODS: This study comprised 74 subjects; 17 were phakic with no ocular pathology, 20 had implantation of a Pharmacia 722C PMMA IOL through a scleral tunnel, 21 had implantation of an Alcon AcrySof IOL through a scleral tunnel, and 16 had implantation of an AcrySof IOL through a corneal incision. Visual acuity and contrast sensitivity testing, ocular optical quality measurement using Hartmann-Shack wavefront sensing, and corneal surface measurement with a videokeratoscope were performed in all cases. RESULTS: There were significant differences between groups in the total root-mean-square (RMS) wavefront aberration over a 6.0 mm pupil (F=3.91; degrees of freedom=3,70; P<.05) mediated at the 4th-order RMS, specifically spherical and tetrafoil aberrations. The PMMA-scleral group had the least aberrations and the AcrySof-corneal group the most. For a 3.5 mm diameter pupil, the total higher-order RMS wavefront aberration was not significantly different between the groups (P>.05). There were no differences between groups in corneal shape, visual acuity, or contrast sensitivity. CONCLUSIONS: Implantation of the spherical PMMA IOL led to a slight reduction in total wavefront aberration compared to phakic eyes. AcrySof IOLs induced more aberrations, especially spherical aberration. Corneal-based incisions for IOL implantation compounded this increase. Studies of the optical performance of IOLs in vivo should use wavefront sensing as the main outcome measure rather than visual measures, which are readily confounded by multiple factors.
    URI
    http://hdl.handle.net/10454/4011
    Version
    No full-text available in the repository
    Citation
    Pesudovs, K., Dietzi, H.H., Stewart, O., Noble, B.A. and Cox, M.J. (2005). Effect of cataract surgery incision location and intraocular lens type on ocular aberrations. Journal of Cataract and Refractive Surgery. Vol. 31, No. 4, pp. 725-734.
    Link to publisher’s version
    http://dx.doi.org/10.1016/j.jcrs.2004.09.028
    Type
    Article
    Collections
    Life Sciences Publications

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