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Variability of control in intermittent exotropia
Sarah R Hatt1, Brian G Mohney, David A Leske
1Department of Ophthalmology, Mayo Clinic College of Medicine, Rochester, Minnesota, USA.
Ophthalmology
|July 17, 2007
Summary
Control of intermittent exotropia fluctuates significantly, even within minutes. This variability suggests that a single assessment may not accurately reflect the condition's severity in patients with intermittent exotropia.
Area of Science:
- Ophthalmology
- Strabismus Management
- Binocular Vision
Background:
- Assessing control is crucial for managing intermittent exotropia and surgical decisions.
- Previous methods may not capture the dynamic nature of control in this condition.
Purpose of the Study:
- To assess changes in intermittent exotropia control over 1 day using a 6-point clinic control scale.
- To evaluate interobserver and minute-to-minute variability in control assessments.
Main Methods:
- Prospective case series of 25 patients with intermittent exotropia.
- Control was measured using a 6-point clinic control scale.
- Interobserver, minute-to-minute, and 1-day variability were assessed.
Main Results:
- High interobserver agreement (kappa = 0.94-0.95).
- Minute-to-minute variability observed in 24% of patients.
- 46% of patients showed control changes over 1 day, including shifts between phoria and tropia.
Conclusions:
- Intermittent exotropia control can vary significantly within minutes and throughout the day.
- The severity of intermittent exotropia may not be accurately categorized by a single, isolated assessment.
- Dynamic assessment is essential for comprehensive management of intermittent exotropia.
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