Disclaimer. Your screen, lighting, viewing distance and vision correction affect this activity. It cannot confirm or rule out color vision differences or determine a clinical vision prescription. Full disclaimer

Visual Acuity Challenge

Spot which way the gap in the ring points.

Start testAbout 2 minutes · demo and practice first

Informal challenge · not a health screening

What it measures

How often you identify the direction of a gap in a ring as the gap gets smaller on your screen.

DurationAbout 2 minutes

Format20 ring trials, untimed

Device and setupKeep your usual glasses or contacts on and sit at a comfortable, normal viewing distance. Do not zoom the page during the activity.

Accessibility limitsDepends on vision by design. Arrow keys or on-screen buttons.

Free resultCorrect answers by gap size

PrivacyYour answers are never sent to advertisers. Signed in, your results are saved to your account.

How it is scored

A raw count of correct gap directions, broken down by gap size. No acuity fraction or prescription.

Starter content, version 1. Difficulty is provisional until pilot data supports it. Full methodology

What Premium adds

Size profile and setup history. One upgrade covers all ten tests. See Premium

Limits

Your screen, lighting, viewing distance and vision correction affect this activity. It cannot confirm or rule out color vision differences or determine a clinical vision prescription.

For education, entertainment and general self-exploration only. These activities are not medical or psychological assessments and do not diagnose, prevent or treat any condition. Results are estimates of performance on these tasks and can be affected by practice, attention, language, your device and your surroundings. If you have concerns about your thinking, vision or hearing, consult a qualified healthcare professional.