Okayama University Medical School Acta Medica Okayama 0386-300X 74 3 2020 Formulas to Estimate Appropriate Surgical Amounts of Unilateral Recession-Resection in Intermittent Exotropia with Distance-Near Disparity 229 236 EN Kiyo Shibata Department of Ophthalmology, Okayama University Hospital Ichiro Hamasaki Department of Ophthalmology, Okayama University Hospital Shinji Toshima Department of Ophthalmology, Kurashiki Medical Center Takehiro Shimizu Department of Ophthalmology, Okayama University Hospital Reika Kono Department of Ophthalmology, Okayama University Hospital Manabu Miyata Department of Ophthalmology and Visual Sciences Kyoto University Graduate School of Medicine Shin Morisawa Department of Ophthalmology, Kawasaki Medical School General Medical Center Takashi Furuse Department of Ophthalmology, Okayama Saiseikai General Hospital Satoshi Hasebe Department of Ophthalmology, Okayama Saiseikai General Hospital Hiroshi Ohtsuki Department of Ophthalmology, Okayama Saiseikai General Hospital Yuki Morizane Department of Ophthalmology, Okayama University Hospital Fumio Shiraga Department of Ophthalmology, Okayama University Hospital Original Article 10.18926/AMO/59956 The purpose of this study was to derive new formulas to provide an optimal surgical procedure and optimal amount of recession-resection (RR) surgery in intermittent exotropia (IXT) with a disparity in angle of deviation depending on the fixation distance. The records of 117 consecutive patients with IXT who underwent RR surgery between March 2008 and December 2011 at Okayama University Hospital were retrospectively examined. Multivariable linear regression analysis was performed using the observed corrective angle of deviation at distance or near fixation as the dependent variable, and amounts of lateral rectus muscle (LR) recession (mm) and medial rectus muscle (MR) resection, and age at surgery (years) as independent variables. Two simultaneous formulas were derived: corrective angle of deviation at distance fixation (��)=1.8�~recession (mm)+1.6�~ resection (mm)+0.15�~age (years)–6.6, and corrective angle at near fixation (��)=1.5�~recession (mm)+1.7�~ resection (mm)+0.18�~age (years)–3.8. Comparisons of coefficient values of the formulas between distance and near fixation revealed that LR recession was more affected by the corrective angle in distance than near fixation. MR resection was more affected at near than distance fixation. We found that our new formulas estimated the appropriate amount of unilateral RR surgery. No potential conflict of interest relevant to this article was reported.

Acta Medica Okayama 2006 Assessment of Cyclodisparity-Induced Slant Perception with a Synoptophore EN Manabu Miyata No potential conflict of interest relevant to this article was reported.