Validation of Novel Metrics from the Accommodative Dynamic Profile

Szostek, Nicola, Buckhurst, Hetal, Purslow, Christine, Drew, Thomas E, Collinson, Avril and Buckhurst, Phillip (2018). Validation of Novel Metrics from the Accommodative Dynamic Profile. Vision, 2 (3), p. 34.

Abstract

Objective and subjective methods of assessing time taken for accommodative change (ToAC) include accommodative dynamics (AD) and accommodative facility (AF). This study investigates the validity of novel metrics derived from the AD-profile and explores their relationship with AF. AD were assessed using a modified open-field autorefractor in 43 healthy adults. Non-linear regression curves were fitted to the data to derive: latency-of-accommodation (nLoA) and -disaccomodation (nLoD), Time-for-accommodation (ToA) and -disaccommodation (ToD), and objective-ToAC (oToAC). Latencies were also calculated through visual inspection of the AD data as in previous studies (pLoA and pLoD). AF was used to assess subjective-ToAC. Statistical analysis explored the relationships between the AD-metrics and AF. Subjects were assessed on three visits to examine intra- and inter-observer repeatability. nLoA and nLoD were greater than pLoA (p = 0.001) and pLoD (p = 0.004) respectively. nLoA and nLoD also demonstrated greater intra- and inter-observer repeatability than pLoA and pLoD. AF demonstrated a moderate, inverse correlation with ToA (p = 0.02), ToD (p = 0.007), and oToAC (p = 0.007). ToD was the single best accommodative predictor of AF (p = 0.011). The novel method for deriving latency was more repeatable, but not interchangeable with the techniques used in previous studies. ToD was the most repeatable metric with the greatest association with AF.

Publication DOI: https://doi.org/10.3390/vision2030034
Divisions: Life & Health Sciences
Life & Health Sciences > Optometry
Additional Information: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
Full Text Link:
Related URLs: http://www.mdpi ... 411-5150/2/3/34 (Publisher URL)
Published Date: 2018-08-21
Authors: Szostek, Nicola
Buckhurst, Hetal
Purslow, Christine
Drew, Thomas E
Collinson, Avril
Buckhurst, Phillip

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