In the lead‑up to Game 5 of the NBA Finals, 32‑year‑old referee Scott Foster trades the usual warm‑ups for a headset drill. Donning a Meta Quest 3, he tracks ten virtual balls—seven green, three orange—before the three orange switch to green and he must still follow them. A perfect score boosts his confidence for the night.

The exercise, part of a cognitive priming program, simulates the visual load of officiating. Foster repeats any failed attempts until error‑free, then adds joystick “blocks” and a virtual boomerang to test decision speed. The whole drill lasts about 15 minutes.

Ares Elite Sports Vision, where Foster and a dozen other NBA refs train, has spread the tech beyond refereeing. Hockey goalies, golfers, auto‑racing drivers and even medical teams use eye‑tracking to sharpen reaction time and diagnose brain health. Companies like Tobii and View Mind provide the underlying hardware.

In sports, the data reveal that longer eye fixations and saccades correlate with better performance, as shown by a study with PING putters that increased quiet‑eye duration by 23 % and improved scores for 67 % of golfers. The trend shows eye‑tracking as a new vital sign for the brain.