Peripapillary chorioretinal atrophy: Bruch's membrane changes and photoreceptor loss

Area of Science:

• Ophthalmology
• Histopathology
• Aging Research

Background:

• Peripapillary changes in the retina are common with age.
• Understanding the structural basis of these age-related alterations is crucial for diagnosing and treating retinal diseases.

Purpose of the Study:

• To investigate the relationship between Bruch's membrane, photoreceptor degeneration, and choriocapillaris atrophy.
• To correlate these findings with retinal pigment epithelium (RPE) degeneration and atrophy adjacent to the optic nerve head, as a function of age.

Main Methods:

• Human eye tissue from individuals aged 36-93 years, without significant ocular pathology, was analyzed.
• Histopathologic analysis included light and electron microscopy, and histochemical staining for carbonic anhydrase and lipids.
• Photoreceptor counts were performed on retinal whole mounts.

Main Results:

• All eyes exhibited peripapillary RPE atrophy or degeneration, with atrophy widening significantly after age 75.
• Abnormalities of the inner Bruch's membrane and RPE basal lamina were associated with RPE degeneration.
• Rod photoreceptor degeneration occurred, and choriocapillaris coverage diminished with RPE degeneration, with complete loss associated with RPE atrophy.

Conclusions:

• Peripapillary chorioretinal atrophy is an age-related degeneration of the RPE-Bruch's membrane complex.
• These changes resemble those observed in the macula and periphery in normal aging eyes.
• The study highlights the structural alterations underlying age-related peripapillary retinal degeneration.