Which test assesses the functional visual field loss in glaucoma?

Which test assesses the functional visual field loss in glaucoma?

• A. Visual acuity testing
• B. Optical coherence tomography
• C. Pachymetry
• D. Standard automated perimetry

Answer: (D)

Functional visual field loss is what perimetry measures. Glaucoma often first reduces sensitivity in the peripheral areas of the visual field, so testing how well a person sees light at many locations across the field is key to detecting and monitoring the damage. Standard automated perimetry asks you to fixate on a central target while light stimuli of varying brightness are shown at numerous test points. The patient signals when they notice each light, and the machine builds a map of retinal sensitivity across the field. This yields a functional picture of vision, highlighting scotomas and patterns typical of glaucoma, and provides global indices to track change over time. In contrast, visual acuity testing checks central, high-contrast clarity; OCT assesses structural integrity of the optic nerve and nerve fiber layer; pachymetry measures corneal thickness. These provide information about structure or single-function aspects, not the patient’s overall visual field function.

Functional visual field loss is what perimetry measures. Glaucoma often first reduces sensitivity in the peripheral areas of the visual field, so testing how well a person sees light at many locations across the field is key to detecting and monitoring the damage.

Standard automated perimetry asks you to fixate on a central target while light stimuli of varying brightness are shown at numerous test points. The patient signals when they notice each light, and the machine builds a map of retinal sensitivity across the field. This yields a functional picture of vision, highlighting scotomas and patterns typical of glaucoma, and provides global indices to track change over time.

In contrast, visual acuity testing checks central, high-contrast clarity; OCT assesses structural integrity of the optic nerve and nerve fiber layer; pachymetry measures corneal thickness. These provide information about structure or single-function aspects, not the patient’s overall visual field function.