The effects of optical vergence, contrast, and luminance on the accommodative response to spatially bandpass filtered targets

Kotulak, John C.; Schor, Clifton M.

doi:10.1016/0042-6989(87)90108-8

Cited by 60 publications

(40 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For low-luminance or low-contrast targets, disparity detection is relatively more accurate than blur detection, and hence accommodation tends to be controlled by fusional vergence. [21][22][23] On the other hand, in patients with ocular misalignment, a high CA/C ratio would be harmful 24 because, once binocular fusion is achieved, fusional vergence, to compensate for ocular misalignment, strongly biases accommodation responses via CA/C linkage when the CA/C ratio is high. This hypothesis is supported by the positive correlation between CA/C ratios and binocular tonic accommodation (Table 1).…”

Section: Discussionmentioning

confidence: 99%

Convergence Accommodation to Convergence (CA/C) Ratio in Patients with Intermittent Exotropia and Decompensated Exophoria

2004

View full text Add to dashboard Cite

show abstract

Section: Discussionmentioning

confidence: 99%

Convergence Accommodation to Convergence (CA/C) Ratio in Patients with Intermittent Exotropia and Decompensated Exophoria

2004

View full text Add to dashboard Cite

show abstract

“…To open the accommodative loop the subject observed a 0.1 c/deg Difference of Gaussian (DoG) stimulus on a computer monitor (generated using NIH Image 1.59.1 software) [21,27]. Before the study commenced it was verified that the DoG stimulus used in this study did indeed open the accommodative loop.…”

Section: Ca/c Ratiomentioning

confidence: 99%

The effect of incipient presbyopia on the correspondence between accommodation and vergence

Baker

Gilmartin

2002

Graefe's Arch Clin Exp Ophthalmol

View full text Add to dashboard Cite

The results of this study fail to support the Hess-Gullstrand theory of presbyopia in that the ciliary muscle effort required to produce a unit change in accommodation increases, rather than stays constant, with age. Data show that the near vision response is limited to the maximum vergence response that can be tolerated and, despite being within the amplitude of accommodation, a stimulus may still appear blurred because the vergence component determines the proportion of available accommodation utilised during near vision.

show abstract

“…The study was approved by the appropriate human use committee. Other procedures which are general to this type of experiment have been described elsewhere (Kotulak & Schor, 1987).…”

Section: Methodsmentioning

confidence: 99%

Red‐green opponent channel mediation of control of human ocular accommodation.

Kotulak

Morse

Billock

1995

The Journal of Physiology

View full text Add to dashboard Cite

1. It has been hypothesized, but not verified empirically, that the control of human ocular accommodation is mediated by either the red‐green or yellow‐blue colour channels. Our goal was to determine experimentally whether the red‐green channel by itself could influence the accommodative response. 2. To find out, we isolated the red‐green channel through chromatic bandpass filtering and measured accommodation under dynamic and static conditions. The effect of this filtering was to modulate the red‐green channel without disturbing either the yellow‐blue or luminance channels. 3. Accommodative gain (ratio of response to stimulus amplitude) declined monotonically with decreasing bandwidth under dynamic conditions. Because the outputs of both the luminance and yellow‐blue colour channels did not vary with bandwidth, the only explanation is that the red‐green opponent process was responsible for the effect. 4. Under static conditions, however, accommodation was independent of bandwidth. This may be attributable to the decreased sensitivity to chromatic contrast that occurs at low temporal frequencies.

show abstract

The effects of optical vergence, contrast, and luminance on the accommodative response to spatially bandpass filtered targets

Cited by 60 publications

References 38 publications

Convergence Accommodation to Convergence (CA/C) Ratio in Patients with Intermittent Exotropia and Decompensated Exophoria

Convergence Accommodation to Convergence (CA/C) Ratio in Patients with Intermittent Exotropia and Decompensated Exophoria

The effect of incipient presbyopia on the correspondence between accommodation and vergence

Red‐green opponent channel mediation of control of human ocular accommodation.

Contact Info

Product

Resources

About