Online Bourdon test

Bourdon Test with Landolt Rings: find the gaps on the right side

Also known as: Landolt ring test, Landolt C cancellation test, Bourdon test online, concentration test with rings

You see a sheet of rings with gaps facing different directions. The top of the screen tells you which side the gap should be on. Mark all those rings, leave the rest alone and press “Sheet done”: the next sheet appears. You have 90 seconds in total. No sign-up needed. Your result is free once you enter your email: we’ll show it to you and send it to your inbox.

Go to the game ↓

90 secondsone game
Ringsgap on one of four sides
No sign-up10 minutes a day
Progressresults are saved

What it trains

What the Landolt ring test checks

The classic Bourdon test is a cancellation task: on a sheet you look for target symbols among similar ones and cross them out. In this version the letters are replaced by rings with a gap, and the side of the gap defines what you’re looking for. It checks concentration, scanning speed and how well you hold up during monotonous work.

Your score for a sheet is the number of correctly marked rings minus the number of extra marks. Missed rings don’t cost points, but they don’t earn any either. The result helps you compare your own games with each other. It’s not a clinical test and not a diagnosis.

You want to check your concentrationA monotonous task where it’s easy to drift off and miss things
You want to compare triesSheet and game results are saved
You’re looking for a Bourdon test alternativeSame principle, no letters: nothing to read
You need a warm-up for eyes and focusA minute and a half of focused work

Concentration

Keeping the search rule in mind for the whole sheet.

Scanning speed

Moving along the rows without skipping rings.

Accuracy

Not marking extras: an extra mark costs a point.

Endurance

Keeping your pace to the end of the 90 seconds.

Rules

How to play

Start
Press “Start”. The top of the screen shows which ring to look for (gap on the right, left, top or bottom).
Mark
Tap the rings with the right gap. Tapping a ring again removes the mark.
Check the sheet
Press “Sheet done”: your points are counted and a new sheet appears, possibly with a different rule.
Result
After 90 seconds the game shows the rings you found, extra marks, misses and the number of sheets.

Play online

Landolt ring test online

Press “Start” and mark the rings with the gap on the given side. You can play 10 minutes a day without signing up.

Bourdon Test: Landolt Rings

A sheet of rings with gaps facing different ways. Mark every ring with the gap on the named side and leave the rest alone. When a sheet is checked, the next one starts. 90 seconds in total.

Free play left today without signing up: 10 min

Method

Where the test comes from

The cancellation test was proposed by French psychologist Benjamin Bourdon in the late 19th century: a person crosses out given letters on a form, and attention is judged by how many symbols were found and missed. Landolt rings appeared around the same time in ophthalmology: they are rings with a gap used to test visual acuity.

We combined both ideas into an on-screen task. It’s a simplified version for training, not a standardized clinical form, and it has no age norms. For another attention task, try the Schulte Table.

1:30A minute and a halfOne clock for all sheets.

4Gap directionsUp, down, left, right.

sheetSheet after sheetThe rule changes from sheet to sheet.

Who it’s for

Which ages

Adults

A calm concentration check. Good for anyone whose work demands attention to numbers and text.

Kids

Good for school-age kids: no reading required. On a phone there are fewer rings per sheet.

60+

The rings are large, you mark them with a tap, and nobody rushes you until the 90 seconds are up.

Questions

Frequently asked questions

How is it different from the classic letter version?

The task is the same: find target symbols among similar ones. Here the symbols are rings with a gap, so you don’t need to read or recognize letters, and the search rule can change from sheet to sheet.

What counts as the result?

For each sheet: correctly marked rings minus extra marks, but never below zero. Points add up over all the sheets you get through in 90 seconds.

What are Landolt rings?

Rings with a small gap. They are used to test visual acuity: you have to tell which way the gap is facing.

Can the result tell me how good my attention is?

No, it’s not a clinical test. The result helps you compare your own games: whether you find more rings and make fewer mistakes over time.

How many sheets do I need to finish?

As many as you can in 90 seconds. You can check a sheet any time you think you’ve marked all the rings.

Save your results and track your progress

Free sign-up: round history, a chart by skill and a daily workout of 5 exercises. No credit card needed.

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Bourdon Test with Landolt Rings: find the gaps on the right side