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The Effects of Fresnel Prism Glasses on Visual Perception, Balance, Gait and Functional Independence in Post-Stroke Patients
Sponsor: Lahore University of Biological and Applied Sciences
Summary
This randomized controlled trial aims to evaluate the effects of Fresnel prism glasses on visual perception, balance, gait, and functional independence in post-stroke patients. Stroke survivors, particularly those with right hemisphere involvement, often experience visuospatial deficits such as unilateral spatial neglect, leading to impaired balance, abnormal gait, and reduced functional independence. Fresnel prism glasses offer a low-cost, non-invasive intervention that may improve visuospatial alignment and postural control by modifying visual input. Adult post-stroke patients will be randomly allocated into an intervention group receiving Fresnel prism glasses alongside conventional physical therapy, and a control group receiving conventional therapy alone. Outcome measures will include the Motor-Free Visual Perception Test, Berg Balance Scale, Functional Independence Measure, and JAKC Observational Gait Analysis. Assessments will be conducted at baseline, post-intervention, and follow-up. The study is expected to provide evidence on whether Fresnel prism glasses can serve as an effective adjunct to conventional rehabilitation for improving mobility, balance, and functional outcomes in stroke survivors.
Key Details
Gender
All
Age Range
55 Years - 65 Years
Study Type
INTERVENTIONAL
Enrollment
50
Start Date
2025-12-13
Completion Date
2026-05-26
Last Updated
2025-12-29
Healthy Volunteers
No
Conditions
Interventions
Fresnel Prism Glasse
Fresnel prism glasses consist of lightweight, flexible, press-on plastic prism lenses with a power of 15 prism diopters, affixed to the inner surface of standard spectacle lenses. The prisms are designed to shift the visual field horizontally to promote visuospatial realignment and improve sensory integration during functional activities. Participants assigned to the experimental group will wear Fresnel prism glasses during supervised physiotherapy sessions. The intervention will be administered alongside conventional physiotherapy, including balance training, gait training, postural control exercises, and functional mobility tasks. The prism glasses will be worn throughout the therapy session to facilitate visual feedback and encourage symmetrical weight-bearing and improved postural alignment. The intervention will be delivered for a duration of 4 weeks, with sessions conducted 5 days per week. Each session will last approximately 30-45 minutes and will be supervised by a qualified
Convetional physical therapy
Conventional physiotherapy will be provided to all participants in both groups according to standard neurorehabilitation protocols. The program will include balance exercises, gait training, strengthening exercises, postural alignment activities, weight-shifting exercises, and task-oriented functional training. Participants in the control group will receive conventional physiotherapy alone, without Fresnel prism glasses, for the same duration and frequency as the experimental group.