In glaucoma assessment, which retinal layer thinning is a key early indicator of optic neuropathy?

In glaucoma assessment, which retinal layer thinning is a key early indicator of optic neuropathy?

• A. Retinal nerve fiber layer
• B. Macular thickness
• C. Ganglion cell layer
• D. Inner nuclear layer

Answer: (A)

Thinning of the retinal nerve fiber layer around the optic nerve is the earliest structural sign of glaucomatous optic neuropathy. This layer contains the axons of retinal ganglion cells as they converge toward the optic nerve, and these axons are usually the first to be damaged in glaucoma. Loss of these axons reduces RNFL thickness, which is reliably detected by imaging methods like OCT and often precedes visible field loss. Macular thickness changes and thinning of the ganglion cell layer also occur as glaucoma progresses, but RNFL thinning is the most sensitive early indicator. The inner nuclear layer is not typically involved in early glaucomatous damage.

Thinning of the retinal nerve fiber layer around the optic nerve is the earliest structural sign of glaucomatous optic neuropathy. This layer contains the axons of retinal ganglion cells as they converge toward the optic nerve, and these axons are usually the first to be damaged in glaucoma. Loss of these axons reduces RNFL thickness, which is reliably detected by imaging methods like OCT and often precedes visible field loss. Macular thickness changes and thinning of the ganglion cell layer also occur as glaucoma progresses, but RNFL thinning is the most sensitive early indicator. The inner nuclear layer is not typically involved in early glaucomatous damage.