Efficacy of Visual and Perceptual Training on Visual Function for Operative Congenital Ectopia Lentis Children: A Randomized Controlled Clinical Trial

Congenital ectopia lentis (CEL) is a hereditary ocular disorder caused by hypoplasia or dysfunction of the lens zonules, and is one of the major etiologies of congenital visual impairment in children and adolescents. Most patients with CEL are children within the critical period of visual development (0-12 years old). Sustained abnormal visual input due to congenital developmental anomalies severely interferes with the normal connection between retinal photoreceptors and the visual center, resulting in severe visual damage. At present, surgery is the main treatment for patients with severe CEL. However, clinical practice has shown that even after standardized surgical intervention and routine postoperative visual rehabilitation training, 36.8% of affected eyes still fail to achieve normal visual levels corresponding to their age. In addition, patients with CEL who undergo IOL scleral fixation often develop a certain degree of astigmatism due to postoperative tilt or decentration of the IOL, which further compromises the improvement of visual function.

In recent years, digital visual perceptual training (HVT), as a novel technique for amblyopia intervention, has attracted considerable attention. Studies have demonstrated that, compared with traditional refractive correction and occlusion therapy, visual perceptual training is characterized by faster visual acuity improvement, higher compliance, and the ability to enhance binocular visual function. Furthermore, as a form of visual perceptual training software, web-based visual perceptual training allows patients to complete training at home through gamified tasks. Meanwhile, training plans can be adjusted according to patients' conditions and progress, enabling personalized treatment regimens. This helps improve treatment compliance and patient experience, and facilitates remote management by hospitals. Notably, the meridional perceptual learning module in visual perceptual training can more effectively improve uncorrected visual function in patients with astigmatism. Nevertheless, no studies to date have focused on the efficacy of visual perceptual training in improving visual function in this specific population of patients with CEL.

This study intends to evaluate the efficacy and safety of visual perceptual training on postoperative visual function in patients with CEL, so as to provide evidence for formulating postoperative visual rehabilitation training strategies for these patients.