Improvement of binocular summation in intermittent exotropia following successful postoperative alignment

Abstract To investigate the improvement of binocular summation (BiS) at high contrast (100%) and different low contrasts (10, 5 and 2.5%) in patients with intermittent exotropia (IXT) after successfully postoperative alignment. A total of 76 patients (aged 9–40 years) with IXT and poor control at di...

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Autores principales:	YuePing Li, Juan Ding, Wei Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/fb7adbc683554f9c9117b83b0b621721
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spelling	oai:doaj.org-article:fb7adbc683554f9c9117b83b0b6217212021-12-02T17:06:31ZImprovement of binocular summation in intermittent exotropia following successful postoperative alignment10.1038/s41598-021-95049-92045-2322https://doaj.org/article/fb7adbc683554f9c9117b83b0b6217212021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-95049-9https://doaj.org/toc/2045-2322Abstract To investigate the improvement of binocular summation (BiS) at high contrast (100%) and different low contrasts (10, 5 and 2.5%) in patients with intermittent exotropia (IXT) after successfully postoperative alignment. A total of 76 patients (aged 9–40 years) with IXT and poor control at distance before surgery were enrolled in this study. The postoperative deviations ranged between 4 PD esophoria to 10 PD exotropia in the primary position (at near and at distance) in all the enrolled patients. The follow-up visits were 2–3 months after the surgery. We analyzed preoperative and postoperative BiS and the proportions of patients with different BiS for the high contrast and the low contrasts. Binocular summation (BiS) was classified into three situations: binocular summation, equal and inbibition. The results of the distant random dots stereograph (RDS) were grouped into A, unable to recognize; B, moderate, 200″ ≤ RDS ≤ 400″ and C, good, RDS < 200″. Following the successful postoperative alignment, the proportion of patients with BiS were increased from 9.2 to 40.8%, 17.1 to 53.9%, 21.1 to 76.1% and 21.1 to 72.4% at 100%, 10%, 5% and 2.5% contrasts respectively. At 2.5% contrast, (1) more patients presented binocular summation in the groups B and C; (2) postoperative improvements of binocular visual acuity (BVA) in groups B (1.5 ± 1.03 lines) and C (1.57 ± 1.26 lines) were significantly different from the BVA in the group A (0.74 ± 1.00 line); and (3) in the group with central fusion, more patients presented BiS after surgery and the postoperative BVA improved by 1.43 ± 1.16 lines. Binocular summation for high contrast and different low contrasts can be improved in patients with IXT after successful surgical treatment. The improvement of BiS was associated with obtaining central fusion, recovering distant stereopsis and good alignment after the surgeries. The most significant improvement was shown at 2.5% contrast and was associated with good stereopsis and central fusion. The improvement of BiS, particularly at low contrast, has benefits for the daily activities in the real environment. BiS improvement could be used as a supplementary assessment of binocular function in patients with IXT before and after treatment.YuePing LiJuan DingWei ZhangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-6 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q YuePing Li Juan Ding Wei Zhang Improvement of binocular summation in intermittent exotropia following successful postoperative alignment
description	Abstract To investigate the improvement of binocular summation (BiS) at high contrast (100%) and different low contrasts (10, 5 and 2.5%) in patients with intermittent exotropia (IXT) after successfully postoperative alignment. A total of 76 patients (aged 9–40 years) with IXT and poor control at distance before surgery were enrolled in this study. The postoperative deviations ranged between 4 PD esophoria to 10 PD exotropia in the primary position (at near and at distance) in all the enrolled patients. The follow-up visits were 2–3 months after the surgery. We analyzed preoperative and postoperative BiS and the proportions of patients with different BiS for the high contrast and the low contrasts. Binocular summation (BiS) was classified into three situations: binocular summation, equal and inbibition. The results of the distant random dots stereograph (RDS) were grouped into A, unable to recognize; B, moderate, 200″ ≤ RDS ≤ 400″ and C, good, RDS < 200″. Following the successful postoperative alignment, the proportion of patients with BiS were increased from 9.2 to 40.8%, 17.1 to 53.9%, 21.1 to 76.1% and 21.1 to 72.4% at 100%, 10%, 5% and 2.5% contrasts respectively. At 2.5% contrast, (1) more patients presented binocular summation in the groups B and C; (2) postoperative improvements of binocular visual acuity (BVA) in groups B (1.5 ± 1.03 lines) and C (1.57 ± 1.26 lines) were significantly different from the BVA in the group A (0.74 ± 1.00 line); and (3) in the group with central fusion, more patients presented BiS after surgery and the postoperative BVA improved by 1.43 ± 1.16 lines. Binocular summation for high contrast and different low contrasts can be improved in patients with IXT after successful surgical treatment. The improvement of BiS was associated with obtaining central fusion, recovering distant stereopsis and good alignment after the surgeries. The most significant improvement was shown at 2.5% contrast and was associated with good stereopsis and central fusion. The improvement of BiS, particularly at low contrast, has benefits for the daily activities in the real environment. BiS improvement could be used as a supplementary assessment of binocular function in patients with IXT before and after treatment.
format	article
author	YuePing Li Juan Ding Wei Zhang
author_facet	YuePing Li Juan Ding Wei Zhang
author_sort	YuePing Li
title	Improvement of binocular summation in intermittent exotropia following successful postoperative alignment
title_short	Improvement of binocular summation in intermittent exotropia following successful postoperative alignment
title_full	Improvement of binocular summation in intermittent exotropia following successful postoperative alignment
title_fullStr	Improvement of binocular summation in intermittent exotropia following successful postoperative alignment
title_full_unstemmed	Improvement of binocular summation in intermittent exotropia following successful postoperative alignment
title_sort	improvement of binocular summation in intermittent exotropia following successful postoperative alignment
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/fb7adbc683554f9c9117b83b0b621721
work_keys_str_mv	AT yuepingli improvementofbinocularsummationinintermittentexotropiafollowingsuccessfulpostoperativealignment AT juanding improvementofbinocularsummationinintermittentexotropiafollowingsuccessfulpostoperativealignment AT weizhang improvementofbinocularsummationinintermittentexotropiafollowingsuccessfulpostoperativealignment
_version_	1718381593824854016

Improvement of binocular summation in intermittent exotropia following successful postoperative alignment

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