Calibrated hyperacuity testCan you see less
Can you see less
than one pixel?
Select your screen type, estimate your viewing distance, and we’ll adapt from an obvious dot shift to much finer alignment differences.
Watch the blue middle dotIf it moves up, choose “Above.” If it moves down, choose “Below.” Choose “Aligned” when all three form a straight line.
1Wear your usual correctionGlasses or contacts, if normally used.
2Test one eye at a timeCover the other eye gently—do not press on it.
3Keep your head stillStay at the selected distance and trust your first impression.
For education only—not a diagnostic eye test.
Screen estimateQuick setup
Choose your screen
No card measurement is needed. Choose the closest device type and enter your approximate eye-to-screen distance.
Computer screen estimateThe app uses a typical pixel density for this device category. The angular result remains approximate.
1 screen step ≈79.4 arcsec