Dynamic measures of vergence accommodation

Am J Optom Physiol Opt. 1977 Jul;54(7):470-3. doi: 10.1097/00006324-197707000-00007.


Dynamic measures of vergence accommodation (VG-ACC) are necessary for complete analysis of the triadic near response but are difficult to obtain because eyeball rotation affects accommodative measures. A dynamic optometer that uses the third Purkinje image is shown to be insensitive to small eye rotations and permits dynamic measures of VG-ACC responses. Such measures are presented to demonstrate the feasibility of this method. Average latency measures of 260 msec for VG-ACC fall between the latency of 160 msec for disparity vergence and the latency of 380 msec for accommodation. Additional dynamic features of VG-ACC resemble those of other components of the near triad.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Accommodation, Ocular*
  • Humans
  • Optometry / methods
  • Reaction Time