Age-related changes in the mouse outer retina

Area of Science:

• Ophthalmology
• Neuroscience
• Gerontology

Background:

• The aging process affects various physiological systems, including the visual system.
• Understanding age-related changes in the retina is crucial for diagnosing and treating visual impairments.

Purpose of the Study:

• To investigate the physiological and structural alterations in the aging normal mouse retina.
• To correlate functional changes with structural integrity in the aging mouse retina.

Main Methods:

• C57BL/6 mice aged 2, 6, and 12 months were studied.
• Rod- and cone-mediated corneal electroretinograms (ERGs) were recorded.
• Retinal structure was quantitatively analyzed, including photoreceptor cell density and cone subtypes.

Main Results:

• A reduction in the amplitudes of rod- and cone-mediated ERGs was observed in older mice.
• No significant age-dependent changes in ERG waveform or implicit times were detected.
• Photoreceptor cell density remained stable, showing no significant age-related decline.

Conclusions:

• The amplitude of the mouse ERG decreases with age, indicating functional decline.
• This functional decline does not correlate with structural changes in photoreceptor cells.
• These age-related ERG changes should be considered in studies of murine models of retinal disorders.