The Effectiveness of Visual Training in Convergence Insufficiency Patients

Status Recruiting

Clinical Trial Summary

Convergence insufficiency (CI) is one of the most common binocular vision disorders. The prevalence of CI ranges from 3% to 6% in school-aged children. CI symptoms include visual fatigue, headache, blurred vision, and diplopia and could be caused while using near-distance viewing. These symptoms might become more severe with increasing need to perform near-distance tasks. Long-term visual symptoms could result in a negative impact on learning behaviors and work performance in patients. Nowadays, visual training is the main type of management for CI patients clinically; however, the existing training protocol required patients to make several visits to the clinic for visual training, which might increase the burden for patients and result in higher failures in training. Therefore, this study will use a simple training method by utilizing prisms for CI patients to train at home, then compare visual symptoms and binocular vision after the training. In stage I of this study, investigators will recruit 60 symptomatic CI participants aged 9 to 30 years old to do a 6-week visual training with the prisms (15 min/time, 3 times/week). The post-training outcomes will be collected at week 4 and week 6. In stage II, all of the participants will be randomly divided into the "stop training group" and the "continue training group." The participants in the "continue training group" will have the same 6-week prism training and in the "stop training group" will stop all the prism training during this period. The final post-training outcomes of all the participants will be collected again at week 12. In this study, investigators will investigate the effectiveness of the prisms training for 6 weeks and for 12 weeks on visual symptoms and binocular vision in CI patients, and evaluate whether the training effect will be affected by stopping training after 6 weeks.

Clinical Trial Description

n/a

Study Design

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT05603962
Study type	Interventional
Source	National Taiwan University Hospital
Contact	Tzu-Hsun Tsai, PhD
Phone	886223123456
Email	lucia_tsai@yahoo.com.tw
Status	Recruiting
Phase	N/A
Start date	March 6, 2023
Completion date	December 31, 2025

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See also
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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.