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.
    LanguageEnglish
    Pages790-793
    JournalBRITISH JOURNAL OF OPHTHALMOLOGY
    Volume91
    Issue number6
    DOIs
    Publication statusPublished - Jun 2007

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    Crystalline Lens
    Saccades
    Head
    Lenses

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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
    Schachar, Ronald A. ; Davila, Carlos ; Pierscionek, Barbara K. ; Chen, Wickham ; Ward, Warren W. / The effect of human in vivo accommodation on crystalline lens stability. In: BRITISH JOURNAL OF OPHTHALMOLOGY. 2007 ; Vol. 91, No. 6. pp. 790-793.
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    Schachar, RA, Davila, C, Pierscionek, BK, Chen, W & Ward, WW 2007, 'The effect of human in vivo accommodation on crystalline lens stability', BRITISH JOURNAL OF OPHTHALMOLOGY, vol. 91, no. 6, pp. 790-793. https://doi.org/10.1136/bjo.2006.110791

    The effect of human in vivo accommodation on crystalline lens stability. / Schachar, Ronald A.; Davila, Carlos; Pierscionek, Barbara K.; Chen, Wickham; Ward, Warren W.

    In: BRITISH JOURNAL OF OPHTHALMOLOGY, Vol. 91, No. 6, 06.2007, p. 790-793.

    Research output: Contribution to journalArticle

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    AU - Schachar, Ronald A.

    AU - Davila, Carlos

    AU - Pierscionek, Barbara K.

    AU - Chen, Wickham

    AU - Ward, Warren W.

    PY - 2007/6

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    N2 - 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.

    AB - 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.

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