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👁️ Crowding Challenge

⚡ Quick Start
Keep your eyes on the center dot throughout the test
A cyan letter will flash briefly (150ms) in your peripheral vision
Identify it while ignoring the flanker letters around it
Press Esc to pause, Space/Enter to start
Click/tap to start
📘 Detailed Instructions

About this test: The Crowding Challenge measures your ability to identify letters in peripheral vision when surrounded by distractors (flankers). This tests the "crowding effect" - a key limitation of peripheral vision.

Settings explained:

Keyboard shortcuts: E/H/N/X = letter responses, Space/Enter = start, Esc = pause

Optional calibration: For tracking progress with precise measurements, calibrate your screen size. Not required to play.