Proximally induced accommodation and accommodative adaptation.

To determine the effect of proximally induced accommodation (PIA) on accommodative adaptation, this study has examined the posttask shift in tonic accommodation (TA) following 5-min monocular viewing of equivalent-sized targets located at distances of 0.33 and 5 m. The distal target was viewed through a negative lens to equate the dioptric stimuli (3 D). The steady-state accommodative response was measured subjectively in 10 subjects using a Hartinger coincidence optometer. A significant correlation was observed between the degree of adaptation following the two conditions, with the magnitude of adaptation for the distal target being approximately half that for the nearer target. Furthermore, adaptation magnitude was inversely correlated with pretask TA under both conditions. These results indicate that PIA can produce accommodative adaptation. The implications of this finding are discussed with regard to models of the accommodative mechanism.

[1]  B. Wick.  Clinical Factors in Proximal Vergence , 1985, American journal of optometry and physiological optics.

[2]  G. Heath,et al.  Components of accommodation. , 1956, American journal of optometry and archives of American Academy of Optometry.

[3]  J. Wolfe,et al.  Adaptation of the resting states of accommodation. , 1987, Investigative ophthalmology & visual science.

[4]  G WESTHEIMER,et al.  AMPHETAMINE, BARBITURATES, AND ACCOMMODATION-CONVERGENCE. , 1963, Archives of ophthalmology.

[5]  S M Ebenholtz,et al.  Accommodative hysteresis: a precursor for induced myopia? , 1983, Investigative ophthalmology & visual science.

[6]  B. Gilmartin,et al.  THE ROLE OF THE SYMPATHETIC NERVOUS SYSTEM IN OCULAR ACCOMMODATION AND AMETROPIA , 1985, Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians.

[7]  George K. Hung,et al.  Static Behavior of Accommodation and Vergence: Computer Simulation of an Interactive Dual-Feedback System , 1980, IEEE Transactions on Biomedical Engineering.

[8]  B. Gilmartin,et al.  Accommodative Adaptation to Monocular and Binocular Stimuli , 1988, American journal of optometry and physiological optics.

[9]  K J Ciuffreda,et al.  Tonic Accommodation, Accommodative Hysteresis, and Refractive Error , 1987, American journal of optometry and physiological optics.

[10]  Accommodative Adaptation Induced by Sustained Disparity‐Vergence , 1988, American journal of optometry and physiological optics.

[11]  C M Schor,et al.  Fatigue of accommodation and vergence modifies their mutual interactions. , 1987, Investigative ophthalmology & visual science.

[12]  S. Ebenholtz.  Accommodative Hysteresis: Relation to Resting Focus , 1985, American journal of optometry and physiological optics.

[13]  M Millodot,et al.  The relationship between tonic accommodation and refractive error. , 1987, Investigative ophthalmology & visual science.

[14]  B Gilmartin,et al.  Temporal Aspects of Accommodative Adaptation , 1989, Optometry and vision science : official publication of the American Academy of Optometry.

[15]  B Gilmartin,et al.  The effect of Timolol Maleate on tonic accommodation, tonic vergence, and pupil diameter. , 1984, Investigative ophthalmology & visual science.

[16]  Frank K. Moss,et al.  The Avoidance of Dynamic Accommodation Through the use of a Brightness-Contrast Threshold , 1937 .

[17]  J. Wolter.  System of Ophthalmology: Vol. V, Ophthalmic Optics snd Refraction , 1971 .

[18]  D A Owens,et al.  Near work, visual fatigue, and variations of oculomotor tonus. , 1987, Investigative ophthalmology & visual science.

[19]  K N OGLE,et al.  On the accommodative convergence and the proximal convergence. , 1957, A.M.A. archives of ophthalmology.

[20]  S M Ebenholtz,et al.  Distance adaptation depends upon plasticity in the oculomotor control system , 1982, Perception & psychophysics.

[21]  Ronald B. Rabbetts,et al.  Clinical Visual Optics , 1984 .

[22]  H W Hofstetter.  THE PROXIMAL FACTOR IN ACCOMMODATION AND CONVERGENCE , 1942 .

[23]  G. Törnqvist,et al.  Effect of cervical sympathetic stimulation on accommodation in monkeys. An example of a beta-adrenergic, inhibitory effect. , 1966, Acta physiologica Scandinavica.

[24]  The effect of vergence adaptation on convergent accommodation , 1988, Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians.

[25]  K J Ciuffreda,et al.  Short-term changes in tonic accommodation. , 1986, Investigative ophthalmology & visual science.

[26]  W. H. Ittelson,et al.  Accommodation, Convergence, and Their Relation to Apparent Distance , 1950 .

[27]  C. Schor,et al.  The Glenn A. Fry award lecture: adaptive regulation of accommodative vergence and vergence accommodation. , 1986, American journal of optometry and physiological optics.

[28]  G. Törnqvist.  The relative importance of the parasympathetic and sympathetic nervous systems for accommodation in monkeys. , 1967, Investigative ophthalmology.

[29]  S. K. Fisher,et al.  The effect of monocular versus binocular fixation on accommodative hysteresis , 1988, Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians.