Imaging Lenticular Autofluorescence in Older Subjects

Area of Science:

• Ophthalmology
• Vision Science
• Biomedical Imaging

Background:

• Age-related lens yellowing, or lenticular autofluorescence (AF), can affect vision, particularly with short-wavelength light.
• Accurate, individualized measurement of lens yellowing is crucial for understanding age-related visual changes.

Purpose of the Study:

• To assess if imaging lenticular AF using a standard retinal confocal scanning laser ophthalmoscope (cSLO) provides a practical, individualized measure of age-related lens yellowing.
• To determine the correlation between lenticular AF and age-related changes in lens density.

Main Methods:

• Lenticular AF was imaged in 75 older subjects (47-87 years) and younger controls using a cSLO with 488-nm excitation.
• Quantitative AF measurements were performed using an internal reference or reduced-illuminance AF imaging (RAFI).
• Lens density was independently estimated using psychophysical methods.

Main Results:

• Lenticular AF intensity was significantly higher in older subjects compared to younger controls (P < 0.05).
• Lenticular AF showed a positive correlation with age and correlated well with psychophysically estimated lens density indices.
• Significant individual variability in lenticular AF was observed among subjects of similar age.

Conclusions:

• Retinal cSLO imaging of lenticular AF is a practical and individualized method for assessing lens yellowing.
• This technique shows potential for distinguishing between preretinal and retinal deficits affecting short-wavelength light perception in older individuals.