To analyze the causes of visual impaired and explore the visual improvement with aids, application effects and problems.

A series of cases study was adopted.Seven hundred and ninety-seven patients with visual impairment were selected from January 2012 to December 2016 in Tianjin Medical University Eye Hospital.The etiological analysis, visual function evaluation and visual aids fitting were performed for 797 patients with visual impairment.After 6 months, 400 patients were randomly selected for follow-up, and application effects, daily use time and the reasons for abandon were evaluated and analyzed.This study followed the Helsinki declaration and was approved by Ethic Committee of the Tianjin Medical University Eye Hospital.

The causes for top three in 797 visual impairment patients were high myopia, congenital eye diseases and diabetic retinopathy respectively.With distant optical visual aids, distance vision of the patients was significantly improved.Thereinto, 66.3% patients used visual aids occasionally every day.The overall effective rate of visual aids fitting was 86.92%, the efficiency of electronic visual aids is obviously higher than that of other near optical visual aids, and the use effect evaluation of electronic aids is also the best.It is found that poor vision, inconvenient use and inability to use are common influencing factors, among which poor vision is the main reason.

High myopia has become the leading cause of visual impairment.Professional visual aids fitting can greatly improve residual vision and effectiveness of visual aids.During the process of application, most of the patients usually don't use the devices for longer duration due to severe eye diseases.Once visual aids meet the patients' visual demands in a certain, they work effectively.

Visual impairment; Low vision; Visual aids; Evaluation