Changes in rod and cone-driven oscillatory potentials in the aging human retina

Area of Science:

• Ophthalmology
• Neuroscience
• Physiology

Background:

• Inner retina function is crucial for vision.
• Age-related changes can affect retinal function.
• Oscillatory potentials (OPs) provide insights into inner retina function.

Purpose of the Study:

• To investigate how aging affects rod- and cone-driven inner retina function using oscillatory potentials (OPs).
• To document age-related changes in OP characteristics.

Main Methods:

• Recorded dark- and light-adapted electroretinogram (ERG) luminance-response functions in healthy human subjects across different age groups.
• Filtered ERG traces to measure OP amplitudes and implicit times.
• Utilized Morlet wavelet transform (MWT) to analyze OP time-amplitude-frequency distribution.

Main Results:

• Reduced OP amplitudes and prolonged implicit times were observed by age 40 under dark adaptation.
• MWT identified distinct high-frequency (age-unaffected) and low-frequency (age-affected) bands in light-adapted OPs.
• A power reduction in the low-frequency band was noted by age 60.

Conclusions:

• Age-related OP changes occur earlier than changes in photoreceptoral (a-wave) and postphotoreceptoral (b-wave) function.
• MWT effectively quantifies distinct retinal oscillators, complementing traditional OP analysis.
• The age-independent, light-adapted high-frequency OP band offers a novel marker for screening retinal degenerations.