Which test helps monitor glaucoma progression besides IOP?

• A. Visual acuity testing
• B. Optical coherence tomography imaging
• C. Color vision testing
• D. Visual field testing and optic nerve imaging

Answer: (D)

Monitoring glaucoma progression means tracking changes over time in both how the optic nerve looks and how vision functions. Pressure alone doesn’t reveal whether the disease is getting worse, so you need tests that show actual progression.

Visual field testing looks at a patient’s functional vision across the field. It detects new or enlarging areas of vision loss (scotomas) and tracks changes in overall sensitivity over visits. This functional evidence is essential because glaucoma is defined by progressive damage to vision, not just elevated pressure.

Optical coherence tomography imaging provides precise, repeatable measurements of the retina’s structure, especially the retinal nerve fiber layer and related layers around the optic nerve. Thinning over time indicates structural progression, often before substantial functional loss is evident.

Using both together gives a fuller picture: you can see where and how vision is declining and confirm that the underlying nerve tissue is thinning. Visual acuity tends to stay normal until later stages, so it’s not a reliable monitor for progression, and color vision testing isn’t routinely used for tracking glaucoma. OCT alone shows structure but not whether function is impacted, and visual field testing alone might miss early structural changes. Hence, the combination of visual field testing and optic nerve imaging best monitors progression beyond IOP.