Drusen accumulate primarily in which Bruch's membrane layer?

Drusen accumulate primarily in which Bruch's membrane layer?

• A. Basement Membrane of the RPE
• B. Inner Collagenous Layer
• C. Outer Collagenous Layer
• D. Elastic Layer

Answer: (D)

Drusen are extracellular, lipid- and protein-rich deposits that form within Bruch's membrane and reflect impaired waste clearance from the retina to the choroid. Bruch's membrane has several layers, arranged from the RPE toward the choroid, including the RPE basement membrane, inner collagenous layer, outer collagenous layer, elastic layer, and the choroidal basement membrane. Drusen preferentially accumulate in the elastic layer of Bruch's membrane. This layer, located near the choroid, is rich in elastic fibers and becomes a favored site for lipid-rich material to deposit as the membrane ages and thickens. The buildup in this layer disrupts the normal exchange between the RPE and choroid, contributing to RPE dysfunction and potential progression toward age-related macular degeneration. Other Bruch's membrane components can be involved in aging changes, but the elastic layer is the principal site associated with drusen formation.

Drusen are extracellular, lipid- and protein-rich deposits that form within Bruch's membrane and reflect impaired waste clearance from the retina to the choroid. Bruch's membrane has several layers, arranged from the RPE toward the choroid, including the RPE basement membrane, inner collagenous layer, outer collagenous layer, elastic layer, and the choroidal basement membrane.

Drusen preferentially accumulate in the elastic layer of Bruch's membrane. This layer, located near the choroid, is rich in elastic fibers and becomes a favored site for lipid-rich material to deposit as the membrane ages and thickens. The buildup in this layer disrupts the normal exchange between the RPE and choroid, contributing to RPE dysfunction and potential progression toward age-related macular degeneration.

Other Bruch's membrane components can be involved in aging changes, but the elastic layer is the principal site associated with drusen formation.