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Related Experiment Videos

Repeatability of the Visual Manipulation Test.

M T Kulp1, K Edwards

  • 1The Ohio State University College of Optometry, Columbus 43210, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|May 5, 2000
PubMed
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The Getman-Henderson-Marcus Visual Manipulation Test (VMT) shows poor repeatability in children. This visual assessment tool should not be used for tracking therapy progress due to inconsistent results.

Area of Science:

  • Optometry
  • Developmental Psychology
  • Educational Assessment

Background:

  • The Getman-Henderson-Marcus Visual Manipulation Test (VMT) is widely utilized for assessing visualization skills.
  • Its objective scoring makes it a popular choice, but its test-retest reliability remains unexamined.

Purpose of the Study:

  • To evaluate the repeatability of the VMT in elementary school children across second, third, and fourth grades.

Main Methods:

  • The VMT was administered to 193 children (mean age 8.72 years).
  • A subset of 56 students was retested by the same optometrist within one month.
  • Repeatability was analyzed using difference vs. mean score plots.

Main Results:

  • All participants successfully completed the VMT.

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  • Mean scores varied by grade: 5.23±1.98 (2nd), 5.76±2.10 (3rd), and 6.95±2.30 (4th).
  • The 95% limits of agreement were -4.5 to 5.2, indicating significant score variability.

    • Conclusions:

    • No significant learning effect was observed upon retesting.
    • The VMT demonstrated poor repeatability, suggesting it is not suitable for monitoring therapeutic interventions.
    • Clinical use of the VMT for progress tracking is not recommended.