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Fresnel Prism in Low Vision Patients With Homonymous Hemianopia Defect in Cipto Mangunkusumo Hospital
Sponsor: Indonesia University
Summary
Background: Homonymous hemianopia is a visual field defect that causes functional disabilities, such as decreased self-confidence, limited mobility, and increased risk of falls. Studies related to the effectiveness and comfort of Fresnel prisms, especially in the Indonesian population are limited. Objective: To evaluate the effectiveness and comfort level of Fresnel prisms in expanding visual field in an Indonesian patient population with homonymous hemianopia.
Official title: Use of Fresnel Prism in Low Vision Patients With Homonymous Hemianopia Defect in Cipto Mangunkusumo Hospital
Key Details
Gender
All
Age Range
18 Years - Any
Study Type
INTERVENTIONAL
Enrollment
25
Start Date
2022-05-01
Completion Date
2022-08-01
Last Updated
2026-04-15
Healthy Volunteers
No
Conditions
Interventions
Fresnel prism
The Fresnel prism chosen was of 40∆ power (the largest size available) with the aim of the largest visual field expansion, which was 20 degrees that the patient felt during environmental orientation and mobilisation. Fresnel prism fitting was performed using the patient's spectacles (if wearing spectacles) or plano glasses provided by the researcher. The patient was given object movement stimulation to identify the visual field boundary and the Fresnel prism was placed 2 mm away from the healthy visual field area. The Fresnel prism was placed on the inner side of the lens. Vertical correction was performed in homonymous hemianopia depending on the visual field defect. The patient was then asked to practice scanning before being asked to wear the Fresnel prism for 5.5 hours daily for two weeks. Patients were given a wear sheet to evaluate the duration of wear in a day.
Locations (1)
Department of Ophthalmology, Faculty of Medicine Universitas Indonesia Cipto Mangunkusumo Hospital, Indonesia
Jakarta, DKI Jakarta, Indonesia