Fresnel Prism in Low Vision Patients With Homonymous Hemianopia Defect in Cipto Mangunkusumo Hospital

Use of Fresnel Prism in Low Vision Patients With Homonymous Hemianopia Defect in Cipto Mangunkusumo Hospital

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.

Study Overview

• Status: Completed
• Conditions: Fresnel Prism
• Intervention / Treatment: Device: Fresnel prism

Detailed Description

: Fresnel prisms with a power of 40∆ were fitted to the patient's spectacles for two weeks. Visual field parameters were analysed using the Humphrey Field Analyzer with the SITA 24-2 algorithm, while the Pelli-Robson and ETDRS charts were used to assess contrast sensitivity and visual acuity, respectively. After visual assessment, comfort was quantitatively assessed using a comfort scale.

• Study Type: Interventional
• Enrollment (Actual): 25
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Indonesia
  • DKI Jakarta
    • Jakarta, DKI Jakarta, Indonesia, 14430
      • Department of Ophthalmology, Faculty of Medicine Universitas Indonesia Cipto Mangunkusumo Hospital, Indonesia

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• subjects with a diagnosis of partial or complete homonymous hemianopia based on the results of the Humphrey perimetry examination;
• age 18 years or older;
• corrected visual acuity of 6/18 or better; and
• willing to give consent for this study and consistently follow the rehabilitation process.

Exclusion Criteria:

• ocular motility disorders; the primary position of the eyeball was not orthophoric; and
• walking disorders that resulted in poor fixation of glasses.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: 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 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

Device: 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.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Visual Fied	Mean Deviation (dB) Pattern Standard deviation (dB) Visual field index (%)	2 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
TPDK	Sharp vision with correction (log mar)	2 weeks
Contrast sensitivity	Contrast sensitivity (log units)	2 weeks

Collaborators and Investigators

• Sponsor: Indonesia University

Publications and helpful links

Helpful Links

• Related Info

Study record dates

Study Major Dates

• Study Start (Actual): May 1, 2022
• Primary Completion (Actual): July 1, 2022
• Study Completion (Actual): August 1, 2022

Study Registration Dates

• First Submitted: April 9, 2026
• First Submitted That Met QC Criteria: April 9, 2026
• First Posted (Actual): April 15, 2026

Study Record Updates

• Last Update Posted (Actual): April 15, 2026
• Last Update Submitted That Met QC Criteria: April 9, 2026
• Last Verified: May 1, 2022

More Information

Terms related to this study

• Keywords: homonymous hemianopia; fresnel prism; visual field impairment
• Additional Relevant MeSH Terms: Neurologic Manifestations; Nervous System Diseases; Eye Diseases; Vision Disorders; Sensation Disorders; Blindness; Pathological Conditions, Signs and Symptoms; Signs and Symptoms; Hemianopsia
• Other Study ID Numbers: 23-06-0925; PUTI Saintekes 2020 Grant (Other Identifier: Universitas Indonesia)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO
• IPD Plan Description: IPD will not be shared due to patient privacy considerations

Study Data/Documents

1. Informed Consent Form
   Information identifier: tri.rahayu01@ui.ac.id

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No