The Prismatic Effect on Stereoacuity in Intermittent Exotropia.
10.3349/ymj.2010.51.1.117
- Author:
Kyoung Sub CHOI
1
;
Seung Ah CHUNG
;
Kyu Sung LEE
;
Jong Bok LEE
Author Information
1. Department of Ophthalmology, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea. 491209@yuhs.ac
- Publication Type:Original Article ; Clinical Trial
- Keywords:
Strabismus;
stereoacuity;
Fresnel prism;
acrylic prism
- MeSH:
Adolescent;
Adult;
Child;
Depth Perception/*physiology;
Exotropia/physiopathology/*therapy;
*Eyeglasses;
Female;
Humans;
Male;
Refraction, Ocular/physiology;
Visual Acuity/*physiology;
Young Adult
- From:Yonsei Medical Journal
2010;51(1):117-120
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: To evaluate the effect of acrylic refractive prism and Fresnel membrane prism on stereoacuity in intermittent exotropia. MATERIALS AND METHODS: Stereoacuities of fifty-two patients (mean age, 12.4 years; range 6 to 45 years) with intermittent exotropia were measured using the Titmus and TNO stereotests, while they wore prisms of varying power on nonfixating eye or evenly on each eye. RESULTS: Stereoacuities were significantly reduced with increasing prism power for both prisms, ranging from 8 to 25 prism dipotres. The effects on stereoacuity in single acrylic prism and single Fresnel prism were similar, whereas spilt Fresnel prisms reduced stereoacuity more than spilt acrylic prisms. Spilt prisms were found to have much less effect on stereoacuity than single prisms for both acrylic and Fresnel prisms. CONCLUSION: The use of acrylic refractive prism shared evenly on each eye would be optimal method to minimize the reduction of stereoacuity during the prismatic therapy for intermittent exotropia.
