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Gain and Movement Time of Convergence‐Accommodation in Preschool Children
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ABSTRACT:
Background.
Convergence‐accommodation is the synkinetic change in accommodation driven by vergence. A few studies have investigated the static and dynamic properties of this cross‐link in adults but little is known about convergence‐accommodation in children. The purpose of this study was to develop a technique for measuring convergence‐accommodation and to study its dynamics (gain and movement time) in a sample of pre‐school children.
Method.
Convergence‐accommodation measures were examined on thiry‐seven normal pre‐school children (mean age = 4.0 ± 1.31 yrs). Stimulus CA/C (sCA/C) ratios and movement time measures of convergence‐accommodation were assessed using a photorefractor while subjects viewed a DOG target. Repeated measures were obtained on eight normal adults (mean age = 23 ± 0.2 yrs).
Results.
The mean sCA/C ratios and movement times were not significantly different between adults and children (0.10 D/Δ [0.61 D/M.A.], 743 ± 70 ms and 0.11 D/Δ [0.50 D/M.A.], 787 ± 216 ms). Repeated measures on adults showed a non‐significant mean difference of 0.001 D/Δ.
Conclusion.
The results suggest that the possible differences in crystalline lens (plant) characteristics between children and adults do not appear to influence convergence‐accommodation gain or duration.
Title: Gain and Movement Time of Convergence‐Accommodation in Preschool Children
Description:
ABSTRACT:
Background.
Convergence‐accommodation is the synkinetic change in accommodation driven by vergence.
A few studies have investigated the static and dynamic properties of this cross‐link in adults but little is known about convergence‐accommodation in children.
The purpose of this study was to develop a technique for measuring convergence‐accommodation and to study its dynamics (gain and movement time) in a sample of pre‐school children.
Method.
Convergence‐accommodation measures were examined on thiry‐seven normal pre‐school children (mean age = 4.
0 ± 1.
31 yrs).
Stimulus CA/C (sCA/C) ratios and movement time measures of convergence‐accommodation were assessed using a photorefractor while subjects viewed a DOG target.
Repeated measures were obtained on eight normal adults (mean age = 23 ± 0.
2 yrs).
Results.
The mean sCA/C ratios and movement times were not significantly different between adults and children (0.
10 D/Δ [0.
61 D/M.
A.
], 743 ± 70 ms and 0.
11 D/Δ [0.
50 D/M.
A.
], 787 ± 216 ms).
Repeated measures on adults showed a non‐significant mean difference of 0.
001 D/Δ.
Conclusion.
The results suggest that the possible differences in crystalline lens (plant) characteristics between children and adults do not appear to influence convergence‐accommodation gain or duration.
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