When taking distance visual acuity in VR, where should you start?

When taking distance visual acuity in VR, where should you start?

• A. Subthreshold
• B. Suprathreshold
• C. Threshold
• D. Peripheral

Answer: (B)

Distance visual acuity testing in VR begins with presenting targets that are clearly above the patient’s anticipated recognition threshold. Starting at a suprathreshold level ensures the patient can reliably see and identify the target, which confirms the VR setup is working properly and that the task is understood. Once reliable responses are established, you gradually reduce the size (or adjust contrast) to approach the threshold to pin down the smallest resolvable detail. Beginning with a subthreshold stimulus would invite guessing and unreliable results, while a purely threshold-level start can be frustrating and inefficient. Peripheral considerations don’t apply to central distance acuity testing, since the goal is to measure central vision performance.

Distance visual acuity testing in VR begins with presenting targets that are clearly above the patient’s anticipated recognition threshold. Starting at a suprathreshold level ensures the patient can reliably see and identify the target, which confirms the VR setup is working properly and that the task is understood. Once reliable responses are established, you gradually reduce the size (or adjust contrast) to approach the threshold to pin down the smallest resolvable detail. Beginning with a subthreshold stimulus would invite guessing and unreliable results, while a purely threshold-level start can be frustrating and inefficient. Peripheral considerations don’t apply to central distance acuity testing, since the goal is to measure central vision performance.