Authors
SURYAKUMAR, R, BSOptom, MSc; BOBIER, W R., OD, PhD, FAAO, MBCO

Gain and Movement Time of Convergence-Accommodation in Preschool Children

publication date
July 2004
Category
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Abstract/Introduction

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).


Conclusion/Results

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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Also, he was better at listening. As a parent, we wanted learning to be fun for our Son, and vision therapy made this possible.


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Vision Therapy is well worth the expense, time and effort. Our son had a hard time focusing handwriting neatly. After vision therapy Seth could complete a task in half the time it previously took his abilities to focus and improved greatly and so did his handwriting.

Also, he was better at listening. As a parent you wanted learning to be fun for our son and vision therapy made this possible.


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He love working with John and these working sessions give him the motivation to gladly work on his homework assignments.

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When we first came to the practice, my son did not have huge issues, but lots of small ones- trouble with reading, sports (hitting the baseball consistently), coordination, etc- that were not easily detectable,but when put together presented issues. The staff here were all very professional and loving towards him. While I was concerned in the reading, my son was concerned with the athletic side. Seeing improvement night off the bat gave him confidence that i have nor seen in him and made him want to not only Come to therapy, but also made him want to work hard. He has surpassed his grade level and above in reading and hit his first home run this year! Thank you!!!


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