Comparison of the ocular wavefront aberration between pharmacologically- induced and stimulus-driven accommodation

S. Plainis, E. Plevridi, I. G. Pallikaris

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    Purpose: To compare the ocular wavefront aberration between pharmacologically- and stimulus-driven accommodation in phakic eyes of young subjects. Methods: The aberration structure of the tested eye when accommodating was measured using the Complete Ophthalmic Analysis System (COAS; AMO WaveFront Sciences, Albuquerque, NM, USA). It was used in conjunction with a purposely-modified Badal optometer to allow blur-driven accommodation to be stimulated by a high contrast letter E with a vergence range between +0.84 D and -8.00 D. Pharmacological accommodation was induced with one drop of pilocarpine 4%. Data from six subjects (age range: 23-36 years) with dark irides were collected. Results: No correlation was found between the maximal levels of accommodative response achieved with an 8 D blur-driven stimulus and pharmacological stimulation. Pharmacological accommodation varied considerably among subjects: maximum accommodation, achieved within 38-85 min following application of pilocarpine, ranged from 2.7 D to 10.0 D. Furthermore, although the changes of spherical aberation and coma as a function of accommodation were indistinguishable between the two methods for low levels of response, a characteristic break in the pattern of aberration occurred at higher levels of pilocarpine-induced accommodation. This probably resulted from differences in the time course of biometric changes occuring with the two methods. Conclusion: Measuring the pilocarpine-induced accommodative response at only one time point after its application may lead to misleading results. The considerable inter-individual differences in the time course of drug-induced accommodative response and its magnitude may lead to overestimation or underestimation of the corresponding amplitude of normal, blur-driven accommodation. Stimulating accommodation by topical application of pilocarpine is inappropriate for evaluating the efficacy of 'accommodating' IOLs. © 2009 The College of Optometrists.
    Original languageEnglish
    Title of host publicationOphthalmic and Physiological Optics|Ophthalmic Physiol. Opt.
    Pages272-280
    Number of pages8
    Volume29
    DOIs
    Publication statusPublished - May 2009

    Keywords

    • Accommodation
    • Crystalline lens
    • Pilocarpine
    • Spherical aberration
    • Wavefront aberration

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