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Accommodative and tonic convergence and anatomical contracture in partially accommodative and non‐accommodative esotropia
Author(s) -
Lee TaeEun,
Kim SeungHyun
Publication year - 2012
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.2012.00924.x
Subject(s) - esotropia , tonic (physiology) , ophthalmology , medicine , optometry , strabismus
Citation information : Lee TE & Kim SH. Accommodative and tonic convergence and anatomical contracture in partially accommodative and non‐accommodative esotropia. Ophthalmic Physiol Opt 2012, 32 , 535–538. doi: 10.1111/j.1475‐1313.2012.00924.x Abstract Purpose: To compare accommodative convergence, tonic convergence, and anatomical contracture quantitatively in partially accommodative esotropia vs non‐accommodative esotropia. Methods: Patients with an esotropia who had undergone surgery under general anaesthesia were evaluated. They were divided into two groups: 17 patients had partially accommodative esotropia and 15 patients had non‐accommodative esotropia (basic esotropia). We supposed that the total esodeviation (Eso) was composed of three components: accommodative convergence (AC), tonic convergence (TC), and anatomical contracture (AnC). We measured the preoperative angle of esodeviation with (AC) or without glasses (Eso) in awakening state at 1/3 m and the preoperative esodeviation under general anaesthesia (AnC). TC was calculated by the formula TC = EsoD−AC−AnC. Results: The average ratios of TC/Eso, AC/Eso and AnC/Eso were 46%, 32%, and 22%, respectively in the partially accommodative esotrope group, and 28%, 1%, and 71%, respectively in the non‐accommodative esotropes. These differences were significant for AC/Eso and AnC/Eso ( p < 0.0001) but not for TC/Eso ( p = 0.15). Conclusions: Among the three components, tonic convergence was responsible for a larger portion of esodeviation than anatomical contracture in partially accommodative esotropia, whereas anatomical contracture played a greater role in the non‐accommodative esotropia group.