2017
DOI: 10.1155/2017/2735969
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Amplitude, Latency, and Peak Velocity in Accommodation and Disaccommodation Dynamics

Abstract: The aim of this work was to ascertain whether there are differences in amplitude, latency, and peak velocity of accommodation and disaccommodation responses when different analysis strategies are used to compute them, such as fitting different functions to the responses or for smoothing them prior to computing the parameters. Accommodation and disaccommodation responses from four subjects to pulse changes in demand were recorded by means of aberrometry. Three different strategies were followed to analyze such … Show more

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Cited by 6 publications
(10 citation statements)
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“…Further, as noted above for mean velocity, the difference in peak velocities may also be attributed to the method of calculation. Notwithstanding, in line with previous studies, we also found greater peak velocities in the direction of disaccommodation, 62,63 but only for the greater accommodative demand, whereas for abrupt changes of 2.25 D the peak velocities were slightly higher during accommodation. Just as for the other parameters, response times were longer under the effect of cannabis, with the slowdown being more pronounced for disaccommodation.…”
Section: Discussionsupporting
confidence: 93%
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“…Further, as noted above for mean velocity, the difference in peak velocities may also be attributed to the method of calculation. Notwithstanding, in line with previous studies, we also found greater peak velocities in the direction of disaccommodation, 62,63 but only for the greater accommodative demand, whereas for abrupt changes of 2.25 D the peak velocities were slightly higher during accommodation. Just as for the other parameters, response times were longer under the effect of cannabis, with the slowdown being more pronounced for disaccommodation.…”
Section: Discussionsupporting
confidence: 93%
“…49 Although it has been demonstrated that the strategy used to analyse the accommodative response dynamics does affect the outcome with regard to its descriptive parameters, there is still no standardised method for performing the analysis, leading to heterogeneous results. 62 The peak velocity was also reduced after cannabis use in both accommodation directions and for the two target distances (Figure 2a,b). We obtained a higher peak velocity than in some previous studies, 48,49 but in line with that found by other authors.…”
Section: Discussionmentioning
confidence: 85%
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“…Measurement of the dynamics of accommodation, such as speed of accommodation/ disaccommodation and latency, can be used as an indicator of the state of the accommodative system [41,42] and the development of presbyopia [43][44][45], in addition to assessment of the amplitude of accommodation [41]. Accommodative latency was found to be shorter in those wearing UVR-blocking contact lenses versus those wearing minimal UVR-blocking lenses, suggesting that UVR exposure can have an impact on when presbyopia occurs.…”
Section: Discussionmentioning
confidence: 99%
“…[5][6][7] Several studies that modeled the accommodative response used techniques such as exponential fitting and sigmoidal fitting because the optical power of the eye shows a quick and large change at first that thereafter gradually slows. [8][9][10][11] The mechanism by which the optical power of the eye undergoes nonlinear changes is not clearly understood.…”
mentioning
confidence: 99%