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Odd Shape is a pure visual discrimination test: find the one shape that differs from the rest. As rounds progress the difference shrinks until it is at the edge of what your eye can resolve, which turns it from a search task into a perception one.
A field of near-identical shapes appears.
One differs subtly from the others.
Find and click it as fast as you can.
Differences get smaller as you progress.
Your score reflects both speed and the subtlety you reached.
Fine visual discrimination. Unlike search tasks where the target is clearly different, this measures the threshold below which a difference stops being detectable.
Defocus slightly. A small difference in shade or size often pops out of a blurred field when it is invisible in a sharp one.
Scan in rows rather than randomly.
Compare neighbouring items to each other rather than to a remembered standard.
Screen brightness matters at the subtle levels — a dim screen costs you rounds.
No, though uncorrected vision will affect your score. It measures discrimination at the level your eyes deliver.
Defocusing suppresses high-frequency detail, which can make a difference in overall shade or size more visible.
Eagle Eye hides a known target among different items. Here everything is the same and one item differs slightly.
At the subtle end, yes. Compare runs made on the same device.