Quantitative fundus autofluorescence in healthy eyes

Area of Science:

• Ophthalmology
• Retinal Imaging
• Biomarkers

Background:

• Fundus autofluorescence (AF) reflects the accumulation of lipofuscin in the retinal pigment epithelium (RPE).
• Standardized quantification of AF (qAF) is needed to establish normative values for healthy eyes.
• Understanding factors influencing qAF is essential for its clinical application.

Purpose of the Study:

• To establish normative data for quantified fundus autofluorescence (qAF) in healthy subjects.
• To identify factors influencing RPE lipofuscin accumulation and AF signal modulation.
• To provide a reference for interpreting qAF in ocular disease.

Main Methods:

• Acquired AF images from 277 healthy subjects (age 5-60) using a Spectralis cSLO.
• Calculated mean gray level, calibrated to internal reference and normative data.
• Evaluated relationships between qAF and age, sex, race, eye color, refraction, and smoking; assessed repeatability.

Main Results:

• qAF significantly increased with age and eccentricity from the fovea.
• qAF was higher in females, whites; lower in blacks, Asians compared to Hispanics.
• No association found with axial length or smoking; repeatability was within ±13%.

Conclusions:

• Established normative qAF data for healthy individuals.
• Identified key demographic and age-related factors influencing qAF.
• Normative qAF data serves as a vital reference for diagnosing ocular diseases.