Dynamics of Accommodative Facility in Myopes

Radhakrishnan, Hema; Allen, Peter M.; Charman, W. N.

doi:10.1167/iovs.07-0269

Cited by 34 publications

(64 citation statements)

References 34 publications

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“…Moreover, they speculated that accommodative facility might be a good predictor of future myopic progression. More recently, Radhakrishnan et al 34 reported a similar finding. Thus, taken together, these findings suggest that blur processing at distance may be less effective in myopes, along with slowed near-tofar dynamics.…”

Section: Discussionmentioning

confidence: 64%

Accommodative Training to Reduce Nearwork-Induced Transient Myopia

Vasudevan

Ciuffreda²,

Ludlam³

2009

Optometry and Vision Science

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Section: Discussionmentioning

confidence: 64%

Accommodative Training to Reduce Nearwork-Induced Transient Myopia

Vasudevan

Ciuffreda²,

Ludlam³

2009

Optometry and Vision Science

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“…Two of these studies used patients with asthenopia (Liu et al, 1979; Bobier & Sivak, 1983), two used normal subjects (Radhakrishnan et al, 2007; Allen et al, 2010) and one measured the change in accommodation over a one week period with no explicit vision training (Randle & Murphy, 1974). …”

Section: Discussionmentioning

confidence: 99%

“…Bobier and Sivak (1983) made similar measurements on four subjects with accommodative infacility and provided them with VT until they achieved normal flipper rates. Radhakrishnan, Allen and Charman (2007) used a PowerRefractor to measure the difference in accommodative facility between emmetropes and myopes and Allen, Charman and Radhakrishnan (2010) used the same method to objectively measure changes in the dynamics of accommodation after three days of VT in normal subjects. None of these studies measured the effect of training on accommodative vergence or the possible role of vergence-accommodation in improvements in accommodative facility.…”

Section: Introductionmentioning

confidence: 99%

“…Likewise, vergence is driven primarily by disparity but is also driven by accommodation by way of accommodative-vergence crosslinks. While the dynamics of accommodation following VT have been measured objectively (Liu et al, 1979; Bobier & Sivak, 1983; Radhakrishnan et al, 2007; Bharadwaj et al, 2009; Allen et al, 2010) the associated accommodative-vergence has not. The present experiment essentially repeat the adaptation experiment of Bharadwaj et al (2009) with the addition of recording eye position for both eyes in order to measure accommodative-vergence.…”

Section: Introductionmentioning

confidence: 99%

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Short-term adaptation of accommodation, accommodative vergence and disparity vergence facility

2012

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Previous studies have found that subjects can increase the velocity of accommodation using visual exercises such as pencil push ups, flippers, Brock strings and the like and myriad papers have shown improvement in accommodation facility (speed) and sufficiency (amplitude) using subjective tests following vision training but few have objectively measured accommodation before and after training in either normal subjects or in patients diagnosed with accommodative infacility (abnormally slow dynamics). Accommodation is driven either directly by blur or indirectly by way of neural crosslinks from the vergence system. Until now, no study has objectively measured both accommodation and accommodative-vergence before and after vision training and the role vergence might play in modifying the speed of accommodation. In the present study, accommodation and accommodative-vergence were measured with a Purkinje Eye Tracker/Optometer before and after normal subjects trained in a flipper-like task in which the stimulus stepped between 0 and 2.5 diopters and back for over 200 cycles. Most subjects increased their speed of accommodation as well as their speed of accommodative vergence. Accommodative vergence led the accommodation response by approximately 77 msec before training and 100 msec after training and the vergence lead was most prominent in subjects with high accommodation and vergence velocities and the vergence leads tended to increase in conjunction with increases in accommodation velocity. We surmise that volitional vergence may help increase accommodation velocity by way of vergence-accommodation cross links.

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“…AF assessment allows the evaluation of the ability of the visual system to perform sudden jumps of accommodation at a determined distance, effectively, progressively, quickly, and comfortably, under monocular and binocular conditions …”

Section: Methodsmentioning

confidence: 99%

Is it possible to relate accommodative visual dysfunctions to neck pain?

Sánchez-González

Pérez-Cabezas

López-Izquierdo

et al. 2018

Annals of the New York Academy of Sciences

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The aim of this study was to establish whether there is a relationship between conditions of accommodative visual dysfunctions and cervical complaints. Fifty-two participants were included. Variables were accommodative amplitude, positive and negative relative accommodation (NRA), accommodative response, and accommodative facility. Subjects were classified as accommodative insufficiency, accommodative excess, or normal. Neck complaints were measured with the Neck Disability Index, the Visual Analogue Scale, and by cervical range of motion, deep flexor muscle activation score, and performance index. We found the following significant relationships: between NRA and both performance index and left-side bending; accommodative amplitude right-eye with right-side bending and with left-side bending; accommodative amplitude left-eye with right-side bending; and accommodative facility left-eye with both performance index and left-side bending. In accommodative amplitude right-eye, aIl participants showed significant values and greater than those with accommodative excess. In both groups, performance index values were decreased. Greater pain and lower right-rotation were found in participants with accommodative excess than in those with accommodative insufficiency. We conclude that accommodative dysfunctions are related to low performance index, decreased range of motion, as well as greater neck pain.

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Dynamics of Accommodative Facility in Myopes

Cited by 34 publications

References 34 publications

Accommodative Training to Reduce Nearwork-Induced Transient Myopia

Accommodative Training to Reduce Nearwork-Induced Transient Myopia

Short-term adaptation of accommodation, accommodative vergence and disparity vergence facility

Is it possible to relate accommodative visual dysfunctions to neck pain?

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