The effect of human in vivo accommodation on crystalline lens stability

Ronald A. Schachar, Carlos Davila, Barbara K. Pierscionek, Wickham Chen, Warren W. Ward

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    Abstract

    Aim: To determine the effect of human in vivo accommodation on the stability of the crystalline lens. Methods: Using a dual Purkinje image (DPI) eyetracker, the phase-time difference and amplitudes of Purkinje images I (P-I) and IV ( P-1V) were measured in 37 normal emmetropic subjects ( 34 women and 3 men; mean age 19.8, range 18-22 years) when they changed focus from 70 to 15 cm and simultaneously rotated their heads horizontally from side to side or made horizontal saccades between two targets 6.8 apart. Results: When the subjects changed focus from 70 to 15 cm and rotated their heads or made eye saccades, the phase-time difference between P-I and P-IV decreased. During saccades, the amplitude of both PI and PIV overshoots significantly increased with focus at 15 cm; however, their ratio (P-IV overshoot amplitude/P-I overshoot amplitude) significantly declined. Conclusions: The lens is stable during accommodation. The implications of these findings on the mechanism of accommodation are discussed.
    Original languageEnglish
    Pages (from-to)790-793
    JournalBRITISH JOURNAL OF OPHTHALMOLOGY
    Volume91
    Issue number6
    DOIs
    Publication statusPublished - Jun 2007

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    Schachar, R. A., Davila, C., Pierscionek, B. K., Chen, W., & Ward, W. W. (2007). The effect of human in vivo accommodation on crystalline lens stability. BRITISH JOURNAL OF OPHTHALMOLOGY, 91(6), 790-793. https://doi.org/10.1136/bjo.2006.110791