The boundary between perifovea and periphery is characterized by the ganglion cell layer thickness of how many cell layers?

The boundary between perifovea and periphery is characterized by the ganglion cell layer thickness of how many cell layers?

• A. Zero cell layers
• B. One cell layer
• C. Two cell layers
• D. Three cell layers

Answer: (B)

The key idea is how the inner retina changes thickness across the macula. The boundary from perifovea to periphery is defined by the ganglion cell layer dropping to essentially a single layer of ganglion cell bodies. Inside the perifovea, you have a thinner GCL, and as you move toward the periphery the GCL becomes thicker with more than one layer. So the characteristic thickness at that boundary is one cell layer.

The key idea is how the inner retina changes thickness across the macula. The boundary from perifovea to periphery is defined by the ganglion cell layer dropping to essentially a single layer of ganglion cell bodies. Inside the perifovea, you have a thinner GCL, and as you move toward the periphery the GCL becomes thicker with more than one layer. So the characteristic thickness at that boundary is one cell layer.