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.

: 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.

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.