Bright illumination is best for testing VA in VR. True or False?

• A. True
• B. False
• C. Not specified
• D. N/A

Answer: (A)

Visual acuity depends on how clearly a target stands out from its background, which is driven by luminance and contrast. In VR, the optotypes are rendered on a display with a fixed brightness, so having bright, well-illuminated conditions helps the letters appear with strong contrast against the background. When the display and environment provide bright illumination, details are easier to resolve, and the measured acuity reflects true resolving ability rather than being limited by dim lighting. If illumination is too low, contrast perception drops and fine details can be harder to discern, which can underestimate acuity. So, in VR testing, using bright, comfortable illumination that yields high contrast on the display supports more reliable, accurate VA measurements.