Color Vision Labs

Vision & Brain Tests

Choose a free self-check for your vision, reaction speed, or attention. Results are for self-assessment, not diagnosis.

Vision

Astigmatism Test

Spot the hallmark sign of astigmatism with the fan-chart self-check — one eye at a time.

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Vision

Contrast Sensitivity Test

Try a low-contrast symbol demonstration and learn why screen results are not clinical measurements.

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Reflex

Reaction Time Test

Wait for green, then tap — measure your reaction speed in milliseconds over five rounds.

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Attention

Stroop Test

Name the ink color, not the word — see your Stroop interference effect in milliseconds.

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The interactive tools run in your browser without an account. They explore vision, reaction speed, or attention; the contrast activity is an uncalibrated demonstration. They do not diagnose a condition. The guides below explain examinations that need professional methods and equipment.

Vision reference & exam guides

Depth Perception TestHow stereopsis, circle tests, and Frisby work, and what a flat screen cannot measure.Visual Field TestLearn how peripheral vision is checked and what to expect at a perimetry appointment.

Vision standards

What Is Legally Blind?The definition: 20/200, the 20-degree field rule, and how it differs from low vision.Legally Blind PrescriptionWhat your prescription means unaided — and why no prescription is the legal test.

Looking for color vision tests?

Color Blind TestScreen your color vision and estimate the type.More Color TestsIshihara, D-15, HRR, anomaloscope and more.

These are free screening and self-assessment tools, not medical diagnoses. Results depend on your screen and setup. For anything that matters, see an eye-care or healthcare professional.