One-muscle surgery in small-angle residual esotropia.

PURPOSE: To report the outcome of unilateral lateral rectus resection for treatment of small-angle residual esotropia following bilateral medial rectus muscle recession. METHODS: A retrospective medical record review was performed for all patients who had undergone bilateral medial rectus muscle recession for congenital esotropia prior to 6 years of age that required further surgical treatment of residual esotropia. We compared two different dosing strategies for resection of a single lateral rectus muscle in the nondominant eye. In group 1, the amount of resection was calculated by doubling the angle of strabismus and applying the recommended surgical dosage to one lateral rectus muscle. In group 2, the amount of unilateral resection was the same as the bilateral dosage for the measured angle, but augmented by 1.5 mm. Postoperative evaluation was performed 1 and 6 months after surgery. RESULTS: Data from 35 patients were analyzed, 17 in group 1 and 18 in group 2. No significant intergroup difference was noted in terms of age at first surgery (p = 0.266), initial surgical dosage (p = 0.693), residual angle of esotropia (p = 0.881), or age at reoperation (p = 0.679). Postoperative alignment was better in group 1 patients at 6 months than at 1 month (residual deviation 3.5(Delta) versus 6.7(Delta), p = 0.022). CONCLUSIONS: Resection of a single lateral rectus muscle with the surgical dosage calculated by doubling the angle of strabismus and applying the recommended surgical dosage to one lateral rectus muscle is a treatment option for patients with small-angle residual esotropia following bilateral medial rectus muscle recession.     

Anteriorization of inferior oblique muscle and downward transposition of medial rectus muscle for lost inferior rectus muscle

A 6-year-old boy who had been treated with bilateral medial rectus muscle recessions 3 years earlier for congenital esotropia was undergoing bilateral inferior oblique muscle recessions to correct inferior oblique muscle overaction. The right inferior rectus muscle was inadvertently cut during this surgery and was irretrievable. To manage this complication, the medial rectus muscle was transposed toward the inferior rectus insertion and the inferior oblique muscle was anteriorized. At the 1 year follow-up visit, no infraduction deficit was present on downgaze and only 8(delta) of left hypertropia was present in primary position.     

Unilateral lateral rectus muscle recession and medial rectus muscle resection with or without advancement for postoperative consecutive exotropia.

PURPOSE: To evaluate the effectiveness of unilateral lateral rectus muscle recession and medial rectus muscle resection with or without advancement in treating postoperative consecutive exotropia. METHODS: We performed a retrospective review on 31 patients with consecutive exotropia who were treated with unilateral lateral rectus muscle recession and medial rectus muscle resection (17 patients) or unilateral lateral rectus muscle recession and medial rectus muscle partial resection combined with advancement (14 patients). All patients had exotropia with a less than 10 prism diopters (PD) distance near-disparity. The characteristics studied before surgery included type of esotropia surgery, detection of amblyopia, presence of an "A" or "V" pattern, dissociated vertical deviation, limitation of adduction, deviation angle measurement, and forced duction testing. Ocular alignment and status of adduction postoperatively at the last follow-up were recorded. RESULTS: Nineteen patients (61.3%) had amblyopia, 17 patients (54.8%) had limitation of adduction, 8 patients (25.8%) had dissociated vertical deviation, and 5 patients (16.1%) had an "A" or "V" pattern. The mean preoperative exodeviation was 47.3 PD. Overall 21 (67.7%) of 31 patients achieved a successful postoperative result (alignment within 10 PD of orthophoria). There was no significant difference in successful alignment in patients treated with unilateral medial rectus muscle resection compared with those treated with unilateral medial rectus muscle partial resection combined with advancement. There was no influence of amblyopia on the result. Twelve (70.6%) of the 17 patients with limited adduction preoperatively showed normalization of adduction postoperatively. CONCLUSIONS: Unilateral lateral rectus muscle recession and medial rectus muscle resection with or without advancement is an effective alternative for treating postoperative consecutive exotropia.     

共同性水平斜视的再次手术

目的 探讨共同性水平斜视手术后施行再次斜视手术的临床特点及手术处理的特殊性.方法 共同性水平斜视手术后施行再次斜视手术的55例患者进行了回顾性临床分析,手术前后进行眼位检查、眼球运动,Titmus立体视检查双眼视觉功能.手术方法:手术前做全麻下或局麻下行牵拉试验.手术方式选择原则:依据视近和视远斜视角的不同,眼球运动受限制的受累肌肉和牵拉试验结果选择术式.术后追踪观察1～8年,平均2年.结果 (1)内斜视术后继发外斜视13例中,除即刻过矫3例在手术后48h内施行内直肌探查术外,其余施行原后徙内直肌完全复位或部分复位术,联合外直肌截除.治愈率76.9%.外斜视术后继发内斜视11例,施行原后徙外直肌完全复位或部分复位术,联合内直肌截除.治愈率81.8%.伴有V型斜视和垂直性斜视者联合水平直肌移位或斜肌减弱术.(2)内斜视欠矫15例中,8例施行内直肌边缘切开联合外直肌截除术;选择单纯在同一眼上外直肌截除术2例;伴有斜肌异常患者,则选择对侧眼内直肌后徙联合外直肌截除并下斜肌后徙5例.术后正位率86.7%.外斜视欠矫16例中:6例施行原外直肌后徙眼边缘切开联合内直肌截除术;2例Ⅴ型外斜视联合双下斜肌后徙,4例外直肌周围瘢痕松解术,4例联合调整缝线.术后正位率87.5%.结论 (1)水平斜视过矫伴有受累肌运动障碍,结合看近与看远斜视角的差别,选择内直肌或外直肌复位术.(2)调整术后缝线可将再次斜视手术的非预期结果降低到最小程度.     

Bilateral lateral rectus resection for residual esotropia.

PURPOSE: Residual or recurrent esotropia is a common problem following bilateral medial rectus recessions for esotropia, and various surgical techniques have been advocated. We have favored bilateral lateral rectus resections. METHODS: We reviewed our results in 25 patients, aged 7 to 89 months (mean 27 months), with a follow-up of 7 to 95 months (mean 39 months) following the second surgery. Survival analysis was used, with success (survival) defined as alignment within 10 PD at last follow-up. RESULTS: Median survival was 84 months with an estimated mean survival of 55 months. There are 15 of 25 patients (60%) currently successful. There were 8 undercorrections and 2 overcorrections. Three patients, included among those not successful, required a third procedure. Survival was similar to previous reports of primary esotropia and consecutive exotropia. CONCLUSIONS: Our results suggest that bilateral lateral rectus resection is a reasonable surgical option in the treatment of residual esotropia following recessions of both medial recti.     

Vertical rectus muscle transposition for bilateral Duane syndrome.

BACKGROUND: Augmented transposition of the superior and inferior rectus muscles to the lateral rectus muscle is effective surgical treatment for esotropia in unilateral Duane syndrome. Medial rectus muscle recession in bilateral Duane syndrome may increase the risk of consecutive exotropia and cause limitation to adduction postoperatively. Vertical rectus muscle transposition may be useful in bilateral Duane syndrome with esotropia. METHODS: We undertook a retrospective review of 11 patients with bilateral Duane syndrome and esotropia in primary position. All patients had vertical rectus muscle transpositions. Six patients had unilateral vertical rectus transpositions (2 eyes with and 4 without suture augmentation). Twelve eyes from 7 children (2 unilateral and 5 bilateral) had transpositions augmented with posterior fixation sutures. Posterior fixation suture were added to large deviations in patients without prior medial rectus recessions. RESULTS: The preoperative esotropia at distance was 22.8 +/- 6.3 prism diopters (PD). It reduced to 2.0 +/- 6.7 PD postoperatively. (P < 0.001) Esotropia at near changed from 21.0 +/- 5.8 PD preoperatively to 1.2 +/- 8.1 PD postoperatively. (P < 0.001) One patient with a 10-degree face turn had complete resolution postoperatively. One patient had a small undercorrection and developed a vertical deviation requiring additional surgery. All patients had improvement in abduction. Nine of 11 patients did not develop any limitation to adduction. One patient developed a -1 adduction deficit 5 years later. Three patients achieved fusion with a mean stereovision of 67 seconds of arc (range, 80-40 seconds.). Follow-up averaged 22.2 months (range, 1-100 months). CONCLUSION: Vertical rectus muscle transposition in patients with bilateral Duane syndrome and esotropia is an effective procedure to improve ocular alignment and motility while preserving adduction.     

Bilateral medial rectus muscle recession for divergence insufficiency pattern esotropia.

PURPOSE: We have identified a group of mostly elderly patients characterized by chronic, slowly progressive esotropia with diplopia at distance. This study was undertaken to analyze the outcomes after bilateral medial rectus muscle recessions in this group of patients with a divergence insufficiency pattern of esotropia. MATERIALS AND METHODS: This is a retrospective consecutive case series of eight patients treated for divergence insufficiency pattern esotropia with bilateral medial rectus muscle recessions. RESULTS: Age at presentation was 44 to 77 years (mean age, 60) and symptoms of diplopia at distance had been present between 3 and 30 years (mean, 12.6). Six patients had been managed with progressively larger amounts of base-out (BO) prism in their distance correction over an average of 12.5 years. Each patient had a manifest esotropia at distance and smaller or no deviation at near. The mean preoperative esodeviation was 20.4 prism diopters (range, 12 to 35) at distance and 5.4 PD (range, 0 to 18) at near with a mean distance-near difference of 15.0 PD. Bilateral medial rectus muscle recession of 3.0 to 4.25 mm (mean 3.5) was performed on each patient. The mean postoperative esodeviation at distance was 3.4 PD (range 0 to 10) and the mean near deviation was 1.8 PD exophoria (range, 8 PD exophoria to 10 PD esotropia) with a mean distance-near difference of 5.1 PD. Three patients still required some prism in their spectacles for the relief of diplopia postoperatively (2 BO, 8 BO, 10 BO). The mean follow-up period was 8.5 months (range, 6 weeks to 46 months). CONCLUSIONS: Bilateral medial rectus muscle recession is an effective treatment for slowly progressive divergence insufficiency pattern esotropia in elderly patients. The reduction in the difference between the distance and near magnitudes of esodeviation afforded by this treatment suggests that a subtle loss of medial rectus muscle elasticity is the etiology.     

Combined bilateral superior rectus muscle recession and inferior oblique muscle weakening for dissociated vertical deviation.

PURPOSE: Dissociated vertical deviation (DVD) is a common disorder that is often difficult to treat satisfactorily with extraocular muscle surgery. Weakening both elevators in a single eye is uncommonly performed because of possible severe upgaze deficiency or chin-up head posture postoperatively. METHODS: A retrospective review of medical records was performed that yielded 14 patients who had undergone bilateral superior rectus muscle recessions (mean 8.1 mm, range 5-10 mm) and bilateral inferior oblique muscle recession, myectomy, or anterior transposition in the treatment of DVD. Three additional patients with asymmetric inferior oblique muscle overaction or true hypertropia in primary gaze position were identified who had bilateral superior rectus muscle recessions combined with unilateral inferior oblique muscle weakening. RESULTS: Mild-to-moderate elevation deficiencies were common postoperatively but never exceeded -2 up-gaze limitation (scale 0 to -4) except in the immediate postoperative period and were not associated with persistent chin-up head posturing. Cosmetically objectionable upper eyelid retraction occurred in one patient after re-recession of a superior rectus muscle but before inferior oblique muscle surgery. Only three patients undergoing four vertical muscle surgeries had residual DVD >10 PD in primary gaze position, and none exhibited manifest dissociated strabismus warranting further treatment. CONCLUSION: Bilateral superior rectus muscle recession of up to 10 mm combined with inferior oblique muscle weakening appears to be a safe surgical approach in the management of patients with large angle or recurrent DVD. Our data further suggest that simultaneous four vertical muscle surgery may be preferred in some patients to weakening the superior rectus or inferior oblique muscles alone.     

Congenital esotropia

Congenital esotropia represents the most common type of strabismus. Its pathogenesis, however, remains uncertain. It is typically characterized as a large angle, constant esotropia with onset during the first six months of life. Associated clinical findings include normal refractive errors for age, amblyopia, dissociated vertical deviation, inferior oblique muscle overaction and nystagmus. It must be distinguished from Duane's retraction syndrome, Moebius syndrome, nystagmus blockage syndrome, and early onset accommodative esotropia, as well as other causes of esotropia in infancy. The surgical management may involve recession of both medial recti muscles, unilateral recession of a medial rectus muscle and a resection of a lateral rectus muscle or three or four muscle surgery.     

Botulinum toxin augmented bilateral lateral rectus recession versus three muscles surgery in large-angle intermittent exotropia

AIM: To report the surgical outcomes of correcting large angle intermittent exotropia in adult patients by bilateral lateral rectus muscle recession with intraoperative use of botulinum toxin and to compare the results with those of bilateral lateral rectus muscle recession and unilateral medial rectus resection. METHODS: The medical records of patients who underwent surgical correction of large angle intermittent exotropia [exotropia >50 prism dioptre (PD)] were retrospectively reviewed. Two groups of patients were identified; Group I (21 patients) had bilateral lateral recti recession augmented with intraoperative botulinum toxin A (BTA) injection into the recessed muscles and group II (30 patients) were treated by bilateral lateral recti recession with unilateral medial rectus muscle resection. Preoperative data were extracted for age, gender, refraction, type of exotropia, angle of stereopsis and angle of deviation. The main outcome measures were the postoperative angle of deviation and stereoacuity angle by Titmus test measured at the end of one year of postoperative follow up. RESULTS: By the end of the first postoperative year, 10 patients in group I (47.6%) and 20 patients in group II (66.7%) achieved esotropia/esophoria <5 PD or exotropia/exophoria <10 PD. The difference in surgical success rate was not statistically significant (P=0.1) but there was a statistically significant higher rate of undercorrection in group I (P=0.03). On the other hand, 3 patients in group I (14.3%) and 5 patients in group II (16.7%) had improved stereopsis; this difference in the sensory outcome was not statistically significant (P=0.8). In the BTA augmented surgery group, good stereoacuity and smaller preoperative angle of deviation were associated with significantly higher surgical success rate (P=0.004, 0.01 respectively). CONCLUSION: BTA augmented bilateral lateral recti recession is associated with higher rate of undercorrection as compared to bilateral lateral recti recession with unilateral medial rectus resection in the correction of large angle intermittent exotropia. The surgical success rate in BTA augmented surgery group is observed to be higher in patients with preoperative smaller angle of deviation and in patients with good stereoacuity.     

The effect of unilateral medial rectus muscle resection in patients with recurrent exotropia

PURPOSE: To investigate the effect of unilateral medial rectus muscle resection for recurrent exotropia after bilateral lateral rectus muscle recession for intermittent exotropia METHODS: A retrospective analysis was made of thirtypatients who underwent unilateral medial rectus resection for recurrent exotropia. All had prior bilateral lateral rectus recession for intermittent exotropia. Data were collected for age, the preoperative deviation, the postoperative deviation at 2 weeks, 3 months, 6 months and the last visit, and the amount of medial rectus resection performed. RESULTS: The average preoperative deviation was 27.0+/-3.6 PD. After unilateral medial rectus resection, average deviation at distance was 2.8 PD at postoperative 2 weeks, 4.5 PD at 3 months, 5.1 PD at 6 months and 5.8 PD at last visit. The average deviation corrected per millimeter of medial rectus resection was 3.53+/-0.17 PD/mm. CONCLUSIONS: Considering that deviation angles of recurrent exotropia is smaller than those of primary surgery and the possibility of saving the other medial rectus muscle, unilateral rectus muscle resection could be effective surgical method for recurrent exotropia.     

Inferior oblique inclusion after lateral rectus surgery

A retrospective and prospective study evaluated the clinical characteristics of patients with inadvertent incorporation of the inferior oblique muscle to the lateral rectus muscle after lateral rectus surgery. Nineteen cases were included in the study (12 retrospectively in the preceding 18 months and 7 during the prospective 5-month period). Thirteen cases with the inferior oblique inclusion occurred after a lateral rectus resection and 6 occurred after a lateral rectus recession. Most patients demonstrated a vertical deviation in the affected eye preoperatively. Nine had hypotropia and 8 had hypertropia. Deficient elevation in adduction in all patients was found on motility testing. After reoperation, despite freeing the inferior oblique from the lateral rectus, most patients had a persistent vertical deviation. Inadvertent inferior oblique inclusion can be avoided by inspecting the under surface of the lateral rectus and freeing any inferior oblique attachment before reattaching the lateral rectus to the globe during either resection or recession.Dedicated to Dr. G.K. von Noorden on the occasion of his 60th birthday     

甲状腺相关眼病眼眶减压术后继发内斜视伴复视的手术疗效观察

目的探讨甲状腺相关眼病(TAO)眼眶减压术后继发内斜视伴复视的斜视矫正手术治疗效果。方法回顾性系列病例研究。选取2016年3月至2018年10月在天津市眼科医院因TAO行眼眶减压术后继发内斜视伴复视行斜视矫正手术治疗的11例患者资料。斜视矫正手术前、后检查患者斜视度数、眼球运动,观察复视情况。手术均在监护下麻醉联合局部麻醉下进行,术中采用被动牵拉试验结合调整缝线方法,调整至第一眼位复视消失。术后定期随访。结果11例患者中男性1例,女性10例;年龄26~42岁;均为单纯内斜视伴复视;内斜视度数10~98三棱镜度;眼眶CT提示患者内直肌不同程度增厚,外直肌增厚程度较内直肌轻。2例患者行单眼内直肌后徙术,2例行双眼内直肌后徙术,2例行单眼内直肌后徙联合外直肌缩短术,另外5例行双眼内直肌后徙联合单眼外直肌缩短术。11例患者术中内直肌后徙量为3.5~7.5 mm,7例联合外直肌缩短术患者外直肌缩短量为2.0~6.0 mm。全部患者术后复视消除,第一眼位正位,均达到治愈标准。眼球运动术前外转受限分级为(-1.91±1.04)级,术后外转受限分级为(-0.64±0.81)级。11例患者均对手术结果满意,术后随访6~24个月,效果稳定,未发现远期过矫患者。结论应用术中调整缝线技术,斜视矫正手术可以有效治疗TAO眼眶减压术后继发的内斜视伴复视。     

The surgical management of consecutive exotropia.

PURPOSE: To review the results and techniques of surgical treatment of consecutive exotropia. METHODS: We performed a retrospective chart review of all patients who underwent surgery for consecutive exotropia in a pediatric ophthalmology practice between 1992 and 2001. Patients were excluded if follow-up lasted < 6 weeks or if exotropia was caused by other ocular disorders such as previous trauma or congenital cataracts. RESULTS: Fifty-nine patients were identified. The procedure performed in the majority of cases was unilateral lateral rectus recession and medial rectus advancement to the original insertion. Seven patients underwent bilateral lateral rectus recession, and 6 underwent lateral rectus recession combined with medial rectus resection. The mean interval between original surgery and surgery for consecutive exotropia was 14.1 years (range 4 months to 47.5 years). The mean preoperative distance exodeviation was 31.7 prism diopters (PD). Satisfactory alignment (ie, within 10 PD of orthophoria) was achieved in 36 patients (61%) at week 1 and 42 patients (71%) at final follow-up. Mean follow up was 16.0 months. Thirty-nine patients (66%) demonstrated an exodrift after surgery (mean 7.6 PD). CONCLUSION: Consecutive exotropia may occur many years, even decades, after esotropia surgery. Lateral rectus recession with advancement of the previously recessed medial rectus is an effective treatment. An exotropic drift occurs after consecutive exotropia surgery, usually within the first 6 weeks. A suitable ocular alignment immediately after surgery for consecutive exotropia is a small-angle esotropia of 5 to 10 PD.     

下直肌后退术治疗甲状腺相关眼病性眼外肌病变

目的 探讨下直肌后退术治疗甲状腺相关眼病性眼外肌病变的适应证、手术特点和效果等.方法 回顾分析诊治的39例甲状腺相关眼病性眼外肌病变需作下直肌后退术的患者.其中男24例:女15例:年龄28.0～66.0岁(平均49.9岁).手术方式包括下直肌后退术31例;下直肌断腱术1例:下直肌后退+上白:肌缩短3例;下直肌后退+内直肌后退2例:右眼下直肌后退+左眼内直肌后退外直肌缩短1例;左眼下直肌后退+右眼上直肌后退下直肌缩短1例.术后平均随访1.4年.结果 术后25例正位,复视消失;欠矫5～15°10例,复视明显改善:过矫4例.20°以内的下斜视行下直肌后退术每1mm后退平均可矫止2.5°.大度数垂直斜(20°～＞45.),78.9%(15/19)行患眼下直肌后退术可矫正;21.0%(4/19)需行下直肌断腱术或加患眼上直肌缩短术.所有大度数垂直斜均需作眼球缝线固定术.结论 下直肌后退术治疗甲状腺相关眼病性眼外肌病变的限制性下斜视效果满意,文中对手术时机、手术特点、手术方式与手术注意点进行了详细的讨论.     

Unilateral versus bilateral medial rectus recession.

BACKGROUND: Unilateral medial rectus recession is suitable for some cases of small-angle deviation in esotropia. This approach limits surgery to one eye, leaves other muscles untouched, and should be quicker than bilateral muscle surgery. This study compared the results of a range of medial rectus recessions, both unilateral and bilateral, performed by one surgeon. METHODS: Data were collected on all pediatric patients who had undergone medial rectus recession, unilateral and bilateral, performed by one surgeon between August 1, 1995, and March 31, 2002. Postoperative deviations were calculated from the short- (2 to 8 weeks) and long-term (6 to 48 months) follow-up visits. RESULTS: Medial rectus recessions were performed on 107 patients, 56 unilateral and 51 bilateral. After exclusions were made, 45 (80%) of the unilateral procedures and 41 (80%) of the bilateral cases were studied. At long-term follow-up, the mean prism diopter (PD) change in deviation per millimeter recessed (at distance) for unilateral recessions of 5 mm, 6 mm, 7 mm, and 8 mm were 2.3, 2.2, 2.3, and 2.5, respectively. For equivalent bilateral recessions the mean changes in deviation were 4.2, 4.0, 4.3, and 5.0 PD/mm. CONCLUSION: Unilateral medial rectus recession is a predictable method for surgical correction of small-angle pediatric esotropia. The change in deviation per millimeter of recession after unilateral recession is significantly less than that obtained from equivalent amounts of bilateral recession (P <.01).     

继发性外斜视手术方式及术后眼位变化

目的研究内斜视术后继发外斜视的手术方式及术后眼位的变化。方法手术治疗43例内斜视术后继发外斜视的病人,探讨其手术方式并观察术后1周、6周、6个月和1年的眼位变化情况。结果单眼内直肌前徙7例,单眼内直肌缩短4例,单眼内直肌前徙＋单眼外直肌后徙20例,双眼外直肌后徙5例,单眼外直肌后徙3例;4例外斜视度数≥50△行3条肌肉的手术。术后1年35例眼位正位（81.3%）,其中单眼内直肌前徙或缩短11例术后8例（72.7%）正位,外直肌后徙8例（5例为双眼,3例为单眼）术后6例（75%）正位,单眼内直肌前徙＋单眼外直肌后徙20例术后18例（90%）正位;1周～6周斜视度数变化-5.2△±0.4△,6周～6个月变化-1.2△±0.4△,1周～1年变化-6.4△±2.1△。1周～6周有25例患者（58.1%）有外斜视漂移,变化-8.0△±1.4△,其中术中过矫组的10例继发外斜视患者,术后6周内均出现了外斜视漂移,平均为-8.3±2.0△。结论外直肌后徙联合后徙的内直肌前徙是治疗继发性外斜视的有效方式。术中5△～10△小度数过矫可提高远期的术后正位率。     

A-pattern esotropia with bilateral inferior oblique muscle overaction

An eight-year-old boy with residual congenital esotropia, with an A-pattern and overacting inferior obliques is described. Unilateral medial rectus maximal recession and insertion supraplacement, combined with bilateral inferior oblique myectomies resulted in disappearance of the A-pattern. This is the fourth reported case of A-pattern esotropia with overacting inferior obliques. Factors related to horizontal rectus muscle function in up- and down-gazes may explain the pattern seen in this, and similar cases.     

Clinical features and surgery for acquired progressive esotropia associated with severe myopia

PURPOSE: The purpose of this study was to evaluate the clinical and physiological findings and to determine the most appropriate surgical procedure for acquired progressive esotropia with severe myopia. METHODS: Thirty-eight cases of acquired progressive esotropia with severe myopia were examined to evaluate their clinical and physiological findings. All cases were divided into four groups according to the limitation of their abduction. The eyeball in group IV is fixed in an extremely adducting position. Thirty-one cases underwent strabismus surgery; medial rectus muscle recession and lateral rectus muscle resection in 23 cases, transposition of superior and inferior rectus muscles (modified Jensen procedure included) in eight cases. RESULTS: The medial rectus muscle recession with the lateral rectus muscle resection procedure was effective in the early stage of acquired progressive esotropia patients. Transposition procedure was effective in the severe abducting limited patients. CONCLUSIONS: As the recession & resection procedure is easier than the transposition procedure, we recommend performing surgery in the earlier stage of the abducting disorder before the eyeball is fixed in an extremely adducting position.     

Bilateral lateral rectus resection in patients with residual esotropia

Unilateral or bilateral lateral rectus resection is commonly performed for the correction of residual esotropia, but few results have been reported. Twenty-eight patients with residual esotropia underwent bilateral lateral rectus (BLR) resection. Six months after operation (n = 25), there were 17 (68%) successful cases, 7 (28%) cases of undercorrection, and 1 (4%) case of overcorrection. The success rate at the 24th postoperative month (n = 11) was 72.7%. The success rate for cases of infantile esotropia (n = 18) was higher than that for acquired esotropia (n = 7) at the 6th postoperative month (p = 0.156). The results were not significantly affected by the presence of other deviations (p = 0.387), the performance of other surgery (p = 0.393), the presence of amblyopia (p = 1.00), or the amount of residual esotropia (p = 0.604). Performance of BLR resection in patients with residual esotropia after bilateral medial rectus (BMR) recession is considered appropriate due to its high success rate and provision of a stable alignment during two-year follow up.