Depth-of-Field of the Accommodating Eye

Bernal-Molina, Paula; Montés‐Micó, Robert; Legras, Richard; López‐Gil, Norberto

doi:10.1097/opx.0000000000000365

Cited by 35 publications

(32 citation statements)

References 31 publications

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“…2 ). The accommodation measures exhibited the expected properties, a small lag at “near” and a small lead at “far” (Bernal-Molina et al 2014 ; Seidemann and Schaeffel 2003 ). At “near”, participants loaded their accommodative system with an average of 26% out of age predicted maximum level (min–max 20–46%).…”

Section: Resultsmentioning

confidence: 87%

Effect of ciliary-muscle contraction force on trapezius muscle activity during computer mouse work

2018

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The present study aimed to identify whether or not an increase in ciliary-muscle contraction force, when the eye-lens is adjusted for viewing at a near distance, results in an increase in trapezius muscle activity, while performing a natural work task. Twelve participants, ranging in age from 21 to 32 years, performed a computer-mouse work task during free gaze conditions. A moving visual target was tracked with a computer mouse on a screen placed at two different distances from the eyes, 25 cm and 50 cm. Tracking performance, eye accommodation, and bilateral trapezius muscle activity were measured continuously. Ciliary-muscle contraction force was computed according to a formula which takes into account the age-dependent, non-linear relationship between the contraction force of the ciliary muscle and the produced level of eye accommodation. Generalized estimating equations analyses were performed. On the dominant hand side and for the nearest screen distance, there was a significant effect of ciliary-muscle contraction force on the trapezius muscle activity ( p < 0.001). No other effects were significant ( p > 0.05). The results support the hypothesis that high visual demands, during computer mouse work, increase ciliary muscle contraction force and contribute to a raise of the sustained level of trapezius muscle activity. The current study specifically clarifies the validity of the relationship between ciliary-muscle contraction force and trapezius muscle activity and demonstrates that this relationship is not due to a general personality trait. We conclude that a high level of ciliary muscle contraction force can contribute to a development of musculoskeletal complaints in the neck–shoulder area.

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Section: Resultsmentioning

confidence: 87%

Effect of ciliary-muscle contraction force on trapezius muscle activity during computer mouse work

2018

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“…It has been demonstrated that the eye uses its depth of field both in far and near vision in order to increase the subjective AA. 33 In addition to the limitation imposed by photoreceptor sampling and photonic noise, depth of field occurs because of the presence of HOAs when the pupil is larger during relaxed accommodation, 24 and as a consequence of the accommodative miosis. 34…”

Section: The Influence Of Aberrations On the Subjective And Objectivementioning

confidence: 99%

Aberrations and accommodation

Águila-Carrasco

Kruger

Lara

et al. 2020

Clinical and Experimental Optometry

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Modern methods of measuring the refractive state of the eye include wavefront sensors which make it possible to monitor both static and dynamic changes of the ocular wavefront while the eye observes a target positioned at different distances away from the eye. In addition to monitoring the ocular aberrations, wavefront refraction methods allow measurement of the accommodative response while viewing with the eye's habitual chromatic and monochromatic aberrations present, with these aberrations removed, and with specific aberrations added or removed. A large number of experiments describing the effects of accommodation on aberrations and vice versa are reviewed, pointing out the implications for fundamental questions related to the mechanism of accommodation.

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“…and Tucker & Charman noticed, this dependence is greatly affected by its interaction with letter size. It also depends on other parameters such as luminosity, contrast, and state of accommodation of the eye . Although various studies have been carried out to understand the effects of high order, monochromatic aberrations on DOFi, the effects of another important aberration – the longitudinal chromatic aberration (LCA) on accommodation error have not been explored in depth so far.…”

Section: Introductionmentioning

confidence: 99%