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Refractive error changes following strabismus surgery.

M W Preslan¹, G Cioffi, Y I Min

¹Department of Ophthalmology, University of Maryland, Baltimore.

Journal of Pediatric Ophthalmology and Strabismus

|September 1, 1992

Summary

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Strabismus surgery may cause permanent changes in astigmatism, specifically an increase in astigmatic power at 180 degrees. This refractive error change was observed in both pediatric and adult patients following the procedure.

Area of Science:

Ophthalmology
Refractive Surgery
Pediatric Ophthalmology

Background:

Previous studies suggest strabismus surgery can alter refractive error.
The exact nature and permanence of these refractive changes require further investigation.

Purpose of the Study:

To prospectively evaluate changes in refractive error after strabismus surgery.
To assess both spherical and astigmatic refractive components.
To analyze corneal topography for qualitative changes post-surgery.

Main Methods:

Prospective enrollment of 68 patients undergoing strabismus surgery.
Pre- and postoperative cycloplegic refraction measurements.
Computerized corneal topography for adult patients.
Comparison of spherical and meridional equivalents.

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Main Results:

No significant change in spherical equivalent was detected.
A significant increase in astigmatic power at the 180 degrees was observed in pediatric and adult patients.
No qualitative changes in corneal topography were noted.
The astigmatic change persisted for 4 months post-surgery.

Conclusions:

Strabismus surgery can lead to a persistent increase in astigmatic power at the 180-degree meridian.
This change is equivalent to a plus-cylinder correction at 90 degrees.
Refractive error monitoring is crucial after strabismus surgery.