Ocular Photometry — live reading

The eye reads like a sky

Your camera watches how your eyelids behave — how long blinks last, how often they come, how low the lids sit between them — and renders the result as a small sky: bright and structured when rested, collapsing toward a dark core when the eyes are running on empty. It all happens in this tab. No video is stored or sent anywhere.

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Waiting for the camera

Start a reading to let the page look at your eyes.

PERCLOS: —
Blink rate: —
Blink duration: —
Lids at rest: —
Gaze jitter: —
Face time: —

First reading on this device.

Sky map — past readings

What it measures

PERCLOS: Share of the last minute the eyes were at least 80% closed. The one signal here with real drowsiness-detection research behind it, so it carries most of the score.
Blink duration: Mean length of recent blinks. Alert blinks are quick; they stretch past 300 ms as drowsiness sets in.
Lids at rest: How far the lids sit closed between blinks, relative to your own calibrated open-eye baseline from the first eight seconds.
Blink rate: Blinks per minute. Very low rates go with screen fixation; very high rates with fatigue and irritation.
Gaze jitter: How much the irises drift over two seconds while you look at the screen — a rough stand-in for fixation stability.

Frames are processed on this device by MediaPipe's face landmarker running in your browser. No video is recorded or uploaded; only the numbers above are kept, in this browser's local storage, so the next reading can show what changed. This is an experiment, not a diagnostic instrument — eyelid behaviour is an indirect, noisy proxy for how tired you are, and none of this is medical guidance.

Privacy — exactly what is recorded and where it lives · Source