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Completed

NCT Number: NCT07531667

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.

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Key information

Conditions

Fresnel Prism Blindness Eye Diseases Hemianopsia Nervous System Diseases Neurologic Manifestations Pathological Conditions, Signs and Symptoms Sensation Disorders Signs and Symptoms Vision Disorders

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Department of Ophthalmology, Faculty of Medicine Universitas Indonesia Cipto Mangunkusumo Hospital, Indonesia

Jakarta, DKI Jakarta, 14430, Indonesia

About this study

: 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.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

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.

Treatment and study plan

Fresnel prism

Device

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.

Primary outcomes

  1. Visual Fied

    Time frame: 2 weeks

    Mean Deviation (dB) Pattern Standard deviation (dB) Visual field index (%)

Secondary outcomes

  1. TPDK

    Time frame: 2 weeks

    Sharp vision with correction (log mar)

  2. Contrast sensitivity

    Time frame: 2 weeks

    Contrast sensitivity (log units)

Sponsors and collaborators

Lead sponsor

Indonesia University

Other

Registry information

Official study title

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

Important dates

Study start
2022
Primary completion
2022
Study completion
2022
First posted
Apr 15, 2026
Registry last updated
Apr 15, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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