Vertical vergence adaptation does improve with practice.
OBJECTIVE
To investigate the effect of repeated testing on adaptation to a 2 Delta vertical prism in subjects with normal binocular single vision.


METHODS
Subjects were required to have good visual acuity and normal binocular single vision. The residual deviation was measured after a 1-min period of adaptation to a 2 Delta vertical prism using a modified Maddox Rod technique. This measurement was repeated 10 times, with a 5-min rest period between each trial.


RESULTS
For eight young adult subjects, the mean residual deviation at 1 min reduced with consecutive trials, and this effect was statistically significant (p < 0.0001). No significant correlation was present between the amplitude of vertical vergence and the increase in adaptation with repeated demand.


CONCLUSIONS
A practice effect for vertical vergence adaptation appears to be present in young adult subjects with normal binocular single vision.
Patel
Nisha
N
University of Sheffield, Academic Unit of Ophthalmology and Orthopedics, Royal Hallamshire Hospital, United Kingdom.
Firth
Alison Y
AY
D000221:Adaptation, Ocular / Q000502:physiology*; D000293:Adolescent; D000328:Adult; D003290:Convergence, Ocular; D006801:Humans; D007858:Learning / Q000502:physiology*; D015357:Vision Disparity / Q000502:physiology; D015348:Vision, Binocular / Q000502:physiology