Fundus Autofluorescence Lifetime Patterns in Retinitis Pigmentosa

Area of Science:

• Ophthalmology
• Medical Imaging
• Retinal Diseases

Background:

• Retinitis pigmentosa (RP) is a group of inherited retinal diseases that cause progressive vision loss.
• Fundus autofluorescence (FAF) is a non-invasive imaging technique that visualizes the accumulation of lipofuscin in the retinal pigment epithelium (RPE).
• FAF lifetime imaging ophthalmoscopy (FLIO) provides quantitative information about the metabolic state of the RPE and photoreceptors.

Purpose of the Study:

• To investigate whether fundus autofluorescence (FAF) lifetimes in patients with retinitis pigmentosa (RP) exhibit disease-specific patterns.
• To compare FLIO findings in RP patients with healthy controls.
• To correlate FAF lifetimes with structural and functional parameters in RP.

Main Methods:

• FLIO was performed in two spectral channels using a 473 nm pulsed laser.
• FAF intensity and spectral domain optical coherence tomography (OCT) were acquired.
• Best corrected visual acuity (BCVA) was measured and compared to FLIO data.

Main Results:

• Mean FAF lifetimes were significantly prolonged in areas of photoreceptor and RPE atrophy in RP patients compared to controls.
• Perifoveal ring structures with prolonged lifetimes were more prevalent and wider in RP patients.
• Short FAF lifetimes in the macular center negatively correlated with BCVA and ellipsoid band diameter in OCT.

Conclusions:

• FLIO reveals characteristic patterns in RP, enabling identification of photoreceptor and RPE atrophy.
• FAF lifetimes can detect ellipsoid zone loss, which correlates with functional vision parameters.
• FLIO offers a valuable tool for assessing disease progression and guiding treatment in RP.