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Br J Ophthalmol doi:10.1136/bjo.2006.110791

The effect of human in vivo accommodation on crystalline lens stability

  1. Ronald A Schachar (ron{at}2ras.com),
  2. Carlos Davila (cd{at}engr.smu.edu),
  3. Barbara K Pierscionek (b.pierscionek{at}ulster.ac.uk),
  4. Wickham Chen (wickham{at}engr.smu.edu),
  5. Warren W Ward (wward{at}fourward.com)
  1. University of Texas at Arlington, United States
  2. Southern Methodist University, United States
  3. University of Ulster, Northern Ireland
  4. Southern Methodist University, United States
  5. Fourward Technnologies, United States
    • Published Online First 10 January 2007

    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 difference and amplitudes of Purkinje images I (PI) and IV (P1V) were measured in 37 normal emmetropic subjects (34 females, 3 males; mean age 19.8, range 18-22 years) when they changed focus from 70 cm 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 cm to 15 cm and rotated their heads or made eye saccades the phase-time difference between PI and PIV decreased. During saccades, the amplitude of both PI and PIV overshoots significantly increased with focus at 15cm and their ratio (PIV overshoot amplitude/PI 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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      1. bjo.2006.110791v1
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