👁️ Stare at center. Grow the circle until you can't detect when motion resumes in periphery.
120px
Foveal Radius
Confidence 0%
Scrutinizer

Foveal Scope Calibration Calibration Complete

Final Radius
0px
Confidence
0%
Staircase History

The graph shows your foveal threshold narrowing over time.

How It Works

Calibration Instructions: 1. Focus on blue cursor, 2. Watch for motion, 3. Press Space
  1. Focus on blue cursor when it appears.
  2. Watch for motion outside the circle in your peripheral vision.
  3. Press Space (or tap) when you see motion resume.

💡 Tip: Don't try to guess the timing. Only press Space when you see the motion change in your peripheral vision.

This tool uses an effect it calls Motion Silence: tiny rotating crosses look nearly static in your peripheral vision, most likely because of crowding, but sharp and colorful in your fovea.

"Wherever your fovea lands, the pattern suddenly pops into sharp, colorful detail."

By measuring where this transition occurs, we can estimate the boundary of your high-acuity foveal and parafoveal region.

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