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The prismatic effect on stereoacuity in intermittent exotropia
Kyoung Sub Choi1, Seung Ah Chung, Kyu Sung Lee
1Department of Ophthalmology, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea.
Yonsei Medical Journal
|January 5, 2010
Summary
Dividing prisms evenly between eyes, particularly acrylic refractive prisms, best preserves stereoacuity in patients with intermittent exotropia during prismatic therapy.
Area of Science:
- Ophthalmology
- Vision Science
- Optometry
Background:
- Intermittent exotropia is a common strabismus with potential impacts on binocular vision.
- Prismatic therapy is used to manage intermittent exotropia, but its effect on stereoacuity requires evaluation.
Purpose of the Study:
- To compare the impact of acrylic refractive prisms and Fresnel membrane prisms on stereoacuity in intermittent exotropia.
- To determine optimal prism application methods for minimizing stereoacuity reduction.
Main Methods:
- Stereoacuity was measured in 52 patients (mean age 12.4 years) with intermittent exotropia using Titmus and TNO stereotests.
- Prisms of 8-25 prism diopters were applied to the nonfixating eye or split between both eyes.
Main Results:
- Increasing prism power significantly reduced stereoacuity for both acrylic and Fresnel prisms.
- Single prisms had less impact than split prisms; split Fresnel prisms reduced stereoacuity more than split acrylic prisms.
- Acrylic and Fresnel single prisms showed similar effects on stereoacuity.
Conclusions:
- Distributing acrylic refractive prisms evenly across both eyes is the optimal strategy to minimize stereoacuity reduction.
- This approach supports effective prismatic therapy for intermittent exotropia while preserving binocular function.
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