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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
Published on: March 29, 2022
Changes in exodeviation following hyperopic correction in patients with intermittent exotropia
Seung Ah Chung1, In Sik Kim, Wook Kyum Kim
1Department of Ophthalmology, Ajou University School of Medicine, Suwon, Korea.
Journal of Pediatric Ophthalmology and Strabismus
|December 24, 2010
Summary
Spectacle correction for hyperopia in patients with intermittent exotropia (X(T)) can increase exodeviation. A trial is recommended before surgery, especially given subnormal AC/A ratios in hyperopic X(T) patients.
Area of Science:
- Ophthalmology
- Strabismus Research
- Pediatric Eye Care
Background:
- Intermittent exotropia (X(T)) is a common strabismus condition.
- The role of refractive error, particularly hyperopia, in X(T) management is debated.
- Understanding the impact of spectacle correction on deviation angles is crucial for treatment planning.
Purpose of the Study:
- To assess changes in deviation angle after spectacle correction in hyperopic X(T) patients.
- To compare these changes with those in myopic and emmetropic X(T) patients.
- To evaluate surgical outcomes based on corrected angles and AC/A ratios.
Main Methods:
- 114 X(T) patients were divided into hyperopic (Group I), emmetropic (Group II), and myopic (Group III) groups.
- Patients wore spectacles for at least 6 months, with exodeviation changes monitored.
- Surgical outcomes were analyzed using spectacle-corrected angles and accommodative convergence/accommodation (AC/A) ratios.
Main Results:
- Hyperopic patients (Group I) showed a significant increase in mean exodeviation after spectacle correction.
- 34% of hyperopic patients experienced a >10 PD exotropic shift.
- Mean AC/A ratios were lower in hyperopic patients (2.63 PD/D) compared to emmetropic (4.03 PD/D) and myopic (4.06 PD/D) groups.
- No significant differences in surgical outcomes were observed across the groups.
Conclusions:
- Hyperopic correction in X(T) can lead to increased exodeviation, despite a subnormal AC/A ratio.
- A substantial proportion of hyperopic X(T) patients experience significant deviation increases with correction.
- Pre-operative spectacle correction trials are recommended for patients with hyperopia and X(T).
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