Department of Ophthalmology, King Georges' Medical University, Lucknow, Uttar Pradesh, India.
Indian J Ophthalmol. 2022 Jan;70(1):210-213. doi: 10.4103/ijo.IJO_1709_21.
To assess the change in binocular summation (BiS) in comitant exotropia (XT) after strabismus surgery.
This is a prospective study on 20 patients who underwent surgery for comitant XT over a one year period. Patients with sensory exotropia and nystagmus were excluded. Best-corrected visual acuity (VA) and contrast sensitivity (CS) of both eyes separately and together (binocularly) were recorded. BiS score was calculated as binocular score minus better eye score. BiS score at the end of 3 months was compared with the preoperative data.
The mean ± SD of BiS score increased from 2.95 ± 0.88 to 4.55 ± 0.68 (P-value < 0.0001) for VA (on ETDRS letters) and from 2.75 ± 0.44 to 4.5 ± 0.76 (P-value < 0.001 for CS (on Pelli-Robson chart) after surgery.
There is significant improvement in BiS in XT after strabismus surgery. Authors recommend its inclusion in evaluation of functional outcome of XT surgery.
评估斜视手术后共同性外斜视（XT）的双眼总和（BiS）变化。
这是一项前瞻性研究，共纳入 20 例在一年内接受共同性 XT 斜视手术的患者。排除有感觉性外斜视和眼球震颤的患者。分别记录双眼和双眼同时（ binocularly ）的最佳矫正视力（VA）和对比敏感度（CS）。BiS 评分计算为双眼评分减去优势眼评分。将术后 3 个月的 BiS 评分与术前数据进行比较。
VA（ETDRS 字母）的 BiS 评分从 2.95 ± 0.88 增加到 4.55 ± 0.68（P 值<0.0001），CS（Pelli-Robson 图表）的 BiS 评分从 2.75 ± 0.44 增加到 4.5 ± 0.76（P 值<0.001），手术后有显著改善。
斜视手术后 XT 的 BiS 显著改善。作者建议将其纳入 XT 手术功能结果的评估中。
