Which instrument is described as flashing simple, abstract patterns of dots and crosses?

• A. Harrington Flocks Screener
• B. Amsler Grid
• C. Automated Perimeter
• D. Tangent Screen

Answer: (A)

The key idea here is identifying a visual field screening tool that uses brief, simple, abstract stimuli. The description of flashing dots and crosses points to the Harrington-Flocks Visual Field Screener, which is designed as a quick bedside screen by presenting rapid, simple stimuli to gauge peripheral vision. It’s meant for fast detection of field defects.

In contrast, the Amsler Grid uses a static grid of straight lines centered on the macula to spot distortion, not flashing patterns. An Automated Perimeter delivers computerized, full-field threshold testing with a wide range of stimuli across a curved display, typically more varied and complex than simple dots and crosses. The Tangent Screen is a manual perimetry method with a flat plane and stationary light targets, not flashing abstract patterns.