Abstract

Long-term objectives of the research are the explication of the variables of which accommodative hysteresis is a function and to isolate certain visual characteristics of individuals to which accommodative hysteresis may be related.
Specific aims i nclude: (1) the relation between the CA/C ratio and the magnitude of accommodative hysteresis, (2) hysteresis magnitude and decay time as a function of the amplitude of accommodation to the fixation target, (3) the influence of hysteresis on the near point and far point of accommodation, (5) the relation between type of refractive error and magnitude of hysteresis effects, (6) hysteresis effects as a function of induction-target contrast and spatial frequency, (7) the role of motion perspective in accommodative hysteresis. The primary method entails determining the refractive state of the eye with a laser optometer modified to make use of the Badal principle. Health related issues arise in connection with the potential role of accommodative hysteresis in clinical refraction and measures of accommodative convergence, accommodative amplitude and range, and estimates of near and far acuity. Hysteresis effects also may play a role in the etiology of myopia and hyperopia.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY003421-05
Application #
3257729
Study Section
Visual Sciences B Study Section (VISB)
Project Start
1980-09-30
Project End
1985-12-31
Budget Start
1984-12-01
Budget End
1985-12-31
Support Year
5
Fiscal Year
1985
Total Cost
Indirect Cost

  Institution

Name
University of Wisconsin Madison
Department
Type
Schools of Arts and Sciences
DUNS #
161202122
City
Madison
State
WI
Country
United States
Zip Code
53715

  Publications

Ebenholtz, S M (1992) Accommodative hysteresis as a function of target--dark focus separation. Vision Res 32:925-9
Ebenholtz, S M (1991) Accommodative hysteresis. Fundamental asymmetry in decay rate after near and far focusing. Invest Ophthalmol Vis Sci 32:148-53
Ebenholtz, S M (1988) Long-term endurance of adaptive shifts in tonic accommodation. Ophthalmic Physiol Opt 8:427-31
Ebenholtz, S M; Zander, P A (1987) Accommodative hysteresis: influence on closed loop measures of far point and near point. Invest Ophthalmol Vis Sci 28:1246-9
Fisher, S K; Ebenholtz, S M (1986) Does perceptual adaptation to telestereoscopically enhanced depth depend on the recalibration of binocular disparity? Percept Psychophys 40:101-9
Ebenholtz, S M (1986) Properties of adaptive oculomotor control systems and perception. Acta Psychol (Amst) 63:233-46
Ebenholtz, S M (1985) Accommodative hysteresis: relation to resting focus. Am J Optom Physiol Opt 62:755-62