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Changes in fusional vergence amplitudes after laser refractive surgery for moderate myopia.

 Jinu Han  ;  Samin Hong  ;  Seungjae Lee  ;  Jin Kook Kim  ;  Hyung Keun Lee  ;  Sueng-Han Han 
 Journal of Cataract and Refractive Surgery, Vol.40(10) : 1670-1675, 2014 
Journal Title
 Journal of Cataract and Refractive Surgery 
Issue Date
PURPOSE: To analyze the effect of bilateral laser refractive surgery on fusional vergence amplitude and near point convergence in normal orthotropic myopic patients. SETTING: Cornea and refractive private practice, Seoul, South Korea. DESIGN: Prospective observational study. METHODS: Moderately myopic patients (2.0 to 6.0 diopters [D]) had bilateral laser refractive surgery with postoperative follow-ups at 1 week and 1 and 3 months. Patients with manifest strabismus, previous strabismus surgery, amblyopia, absent or impaired binocularity, or planned monovision were excluded. The preoperative and postoperative examinations included uncorrected and corrected visual acuities; a prism cover test; evaluation of the convergence, divergence, and vertical fusion amplitude using a rotary prism; and near point convergence. RESULTS: The mean age of the 30 patients was 29 years ± 4 (SD). The mean preoperative refractive error was -4.10 ± 1.32 D in right eyes and -4.14 ± 1.37 D in left eyes. The convergence amplitude at near decreased 1 week and 1 month postoperatively, after which it progressively stabilized to near preoperative values. The convergence amplitude at far (break point) was not changed postoperatively; however, the convergence amplitude at far (recovery point) was increased at 1 month and 3 months (P=.008 and P=.003, respectively). There was a slight increase in near point convergence at 3 months (P<.001). CONCLUSIONS: Although fusional vergence amplitudes at near and near point convergence changed after laser refractive surgery, the changes observed were small or transient. However, patients with latent phoria or strabismus should be warned before having refractive surgery. FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.
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1. College of Medicine (의과대학) > Dept. of Ophthalmology (안과학교실) > 1. Journal Papers
Yonsei Authors
Lee, Hyung Keun(이형근) ORCID logo https://orcid.org/0000-0002-1123-2136
Han, Seung Han(한승한) ORCID logo https://orcid.org/0000-0001-8972-4790
Han, Jinu(한진우) ORCID logo https://orcid.org/0000-0002-8607-6625
Hong, Sa Min(홍사민)
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