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Yunedia Tools

Vision Check (Reference Only)

Reference-only vision checks: a color-vision plate test and a visual acuity chart. These are not a medical diagnosis.

Reference only — not a medical diagnosis

These checks are rough references that depend on your screen, its calibration, the lighting and your viewing distance. They cannot detect or rule out any condition. Only an examination by an eye-care professional can assess your vision. If you have any concern about your eyes, please get a proper test.

Check 1: Color vision plates (reference)

You will see 6 plates made of colored dots. Each plate hides a number. Type the number you see, or choose “I can't see a number”. There is no time limit.

Check 2: Visual acuity (reference)

An “E” will be shown at decreasing sizes. Say which way the three bars of the E point (right, up, left or down). Hold your device at the distance below, set browser zoom to 100%, and cover one eye at a time if you want to check each eye. Each size allows 3 attempts; you need 2 correct to move smaller.

No screen calibration found, so 96 DPI is assumed — sizes may be noticeably off. Calibrate on the Measure tool (measure.yunedia.com) for a better estimate.

How to use

  1. Color plates: read the number hidden in each circle of dots and type it (6 plates).
  2. Acuity check: sit at the chosen distance and say which way the E points.
  3. Treat both results as rough references only, and get a professional examination for anything that matters.

Notes

This page is not a medical diagnosis. The color plates are generated on the spot from dot hues with lightness jitter; their reproduction conditions are fundamentally different from printed professional plates under controlled lighting and inks. Acuity optotype sizes are computed from your screen calibration (or a 96 DPI assumption), and the check stops at 20/25 because smaller letters are only a few pixels tall on typical displays. A good or bad result here cannot conclude anything about your eyes.

FAQ

If I cannot see a plate number, do I have a color vision deficiency?
No. Screen color rendering, brightness, room lighting and fatigue all change what you see. Only a professional examination with proper plates can assess color vision.
Why does the acuity result differ from my usual vision?
Distance, screen calibration, pixel density and zoom all affect the result. In particular, any browser zoom other than 100% changes the optotype size.