MouldVision

Visual contrast test · phone edition

What this measures

How faint a striped patch can you still see?

You will see circular patches of faint bars that lean left, stand upright or lean right. Tap the matching button, or swipe the way they lean. Patches get fainter and finer; one eye at a time; about three minutes per eye.

Why environmental toxin exposure matters to this test

References are numbered as in the report.

Full test Quick test

Full: every patch is shown (45 per eye). Quick: a column stops after two misses in a row; skipped patches are recorded as not presented.

Step 1 of 3

Hold the phone where you would read a message

The front camera estimates how far the screen is from your eyes so the patches can be drawn at the right size. Nothing is recorded or sent; only the distance number is kept. About 40 cm is ideal.

starting camera…

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Camera not available, or want to check it?

Typed distance (cm), used only if the camera cannot measure

One-time check (optional, improves accuracy): measure 40 cm from your eyes to the screen with a tape or ruler, hold there, and tap.

Brightness is at maximum and auto-brightness is off Night Shift / blue-light filter / dark mode is off Room lighting

Step 2 of 3

Cover your left eye

Use your palm, without pressing on the eye. Keep wearing your usual glasses or contacts. The right eye is tested first.

Tap Left, Upright or Right, or swipe the patch the way the bars lean (up-left, straight up, up-right).
Guess if unsure. Tap Can't see only when there is no pattern at all.
The first two patches are easy and count as practice if you get them wrong.

Step 3 of 3

Right eye

Cover your left eye

Right eye done

Now cover your right eye and test the left. Keep the phone at the same distance.

Optional · 1 minute

A few questions about your environment

Stored beside this test record as context and shown in the report as "What you told us". Never used to calculate anything. No name, address or date of birth is collected.

How faint a striped patch can you still see?

Past results on this phone

Hold the phone where you would read a message

Cover your left eye

Right eye

Right eye done

A few questions about your environment