What is optic disc cupping and why is it important in glaucoma?

What is optic disc cupping and why is it important in glaucoma?

• A. Enlargement of the optic cup without loss of tissue
• B. Swelling of the optic disc
• C. Excavation of the optic cup due to loss of neuroretinal rim tissue; indicates glaucomatous damage
• D. Thickening of the neuroretinal rim

Answer: (C)

Optic disc cupping is the excavation of the optic cup caused by loss of neuroretinal rim tissue from retinal ganglion cell death in glaucoma. As these nerve fibers are damaged, the rim thins and the cup enlarges, increasing the cup-to-disc ratio. This cupping is a hallmark sign of glaucomatous damage and helps clinicians identify and monitor disease progression, often correlating with visual field loss. It’s different from optic disc swelling, which reflects edema rather than tissue loss, and it’s not a thickening of the rim—cupping represents the opposite. In some cases, especially normal-tension glaucoma, cupping can occur even with normal intraocular pressure, underscoring its value beyond IOP alone.

Optic disc cupping is the excavation of the optic cup caused by loss of neuroretinal rim tissue from retinal ganglion cell death in glaucoma. As these nerve fibers are damaged, the rim thins and the cup enlarges, increasing the cup-to-disc ratio. This cupping is a hallmark sign of glaucomatous damage and helps clinicians identify and monitor disease progression, often correlating with visual field loss. It’s different from optic disc swelling, which reflects edema rather than tissue loss, and it’s not a thickening of the rim—cupping represents the opposite. In some cases, especially normal-tension glaucoma, cupping can occur even with normal intraocular pressure, underscoring its value beyond IOP alone.