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Factors affecting the clinical testing of accommodative facility.
B Kedzia1, D Pieczyrak, G Tondel
1Department of Optometry, Karol Marcinkowski University of Medical Sciences in Poznań, Poland.
Summary
A new method precisely measures accommodative facility in children by eliminating confounding variables. This refined approach reveals that traditional hand-held flippers are unsuitable for accurate accommodative facility measurement.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Traditional accommodative facility tests are confounded by factors like symbol naming time, lens manipulation, and target size changes.
- These variables can inaccurately represent a patient's true accommodative ability.
Purpose of the Study:
- To introduce a modified method for measuring accommodative facility that eliminates confounding variables.
- To precisely assess accommodative facility in children and compare it with traditional methods.
Main Methods:
- A novel accommodative facility measurement technique was developed, employing double measurement through plano and +/- 2.00 D lenses.
- This method isolates accommodative response by removing factors like symbol naming and lens manipulation.
- Measurements were taken monocularly and binocularly in 43 children aged 7-9 years.
Main Results:
- The average time per accommodation cycle was 3.7 seconds monocularly and 8.5 seconds binocularly.
- Average cycles per minute were 32.1 (dominant eye), 33.8 (non-dominant eye) monocularly, and 22.6 binocularly.
- Results from the modified method showed greater precision compared to traditional hand-held flipper measurements.
Conclusions:
- The modified accommodative facility measurement method provides a more accurate assessment by controlling for extraneous variables.
- Hand-held flipper devices are demonstrated to be inadequate for precise accommodative facility measurement.