Speed of visual acuity was measured for Landolt-C targets presented above and below the line of sight as the targets were moved from 2.4 m to 0.6 m from the observer. Target recognition was faster for a downward than an upward eye movement. There was no difference in response times for the up and down eye-movements when the fixation and target distances were the same.
Get full access to this article
View all access options for this article.
References
1.
AllenM. J. (1953) The influence of age on the speed of accommodation.American Journal of ’ Optometry and Physiological Optics, 30, 393–402.
2.
CampbellF. W., & WestheimerG. (1960) Dynamics of accommodation responses of the human eye.Journal of Physiology (London), 151, 285–295.
3.
CarterJ. H. (1962) A servoanalysis of the human accommodative mechanism.Archivos de la Sociedad Americana de Oftalmologia y Optometria, 4, 137–168.
4.
FerreeC. E., & RandG. (1936) An instrument for measuring dynamic speed of vision, speed of accommodation and ocular fatigue.Archives of Ophthalmology, 15, 1072–1087.
5.
KnollJ H. (1962) The relationship between accommodation and convergence and the elevation of the plane of regard.American Journal of Optometry & Physiological Optics, 29, 130–134.
6.
RobertsonC. J. (1936) Measurement of speed of adjustment of eye to near and far vision.Archives of Ophthalmology, 15, 423–434.
7.
TuckerJ., & CharmanW. N. (1979) Reaction and response times for accommodation.American Journal of Optometry & Physiological Optics, 56, 490–503.
