Mild or early stage glaucoma corresponds to which description?

• A. Moderate-stage glaucoma
• B. Severe-stage glaucoma
• C. Indeterminate
• D. Pre-perimetric glaucoma

Answer: (D)

The concept being tested is the distinction between structural damage and functional loss in glaucoma. Mild or early glaucoma is often described as pre-perimetric glaucoma, which means there is glaucomatous damage to the optic nerve or retinal nerve fiber layer detectable structurally, but no corresponding visual field loss on standard perimetry yet. In other words, the damage has begun, but the function (visual field) is still normal.

This is why pre-perimetric glaucoma best fits the description of mild or early stage: it captures the initial, structural changes before functional impairment becomes measurable. Once a visual field defect appears on testing, the stage typically shifts to perimetric categories (mild, moderate, severe) based on the extent of field loss. The option describing an indeterminate or a more advanced functional loss wouldn’t align with the definition of an early, pre-perimetric stage.