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Color Vision Labs

Free Online Eye Tests

Free online eye tests and brain self-checks, from astigmatism to reaction time. Not a substitute for an eye exam.

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.

Can you take an eye test online?

For a few specific checks, yes; as a replacement for an eye exam, no. An online eye test can screen color vision and show the hallmark pattern of astigmatism, but it cannot measure a glasses prescription or look at the health of the eye. The American Academy of Ophthalmology advises adults with healthy eyes, good vision and no symptoms to have a complete eye exam every 5 to 10 years before age 40 and an eye disease screening by 40; anyone with symptoms, diabetes, a family history of eye disease or contact lenses needs exams on the schedule their eye doctor sets. The National Eye Institute calls a dilated eye exam the only way to check for eye diseases early.

Color vision

Online self-check
Screening works on a normal screen; type and severity are estimates. Color blind test
What it needs instead
In-person accepted tests for jobs, licenses and pilot medicals

Astigmatism

Online self-check
A fan-chart self-check can show the hallmark uneven lines. Astigmatism test
What it needs instead
Refraction to measure the amount and axis

Contrast sensitivity

Online self-check
A demonstration only — an uncalibrated screen gives no clinical threshold. Contrast demo
What it needs instead
A calibrated clinical contrast chart

Glasses prescription and sharpness

Online self-check
Not reliably — screen size and viewing distance vary.
What it needs instead
An eye exam with refraction

Visual field

Online self-check
Not as a substitute for perimetry. Visual field guide
What it needs instead
Perimetry at an eye clinic

Eye health (glaucoma, cataract, retina)

Online self-check
No.
What it needs instead
A dilated eye exam

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.

Sources

Last reviewed October 28, 2026. 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.