Free Online Eye Test
A free comprehensive eye screening tool with 8 vision tests you can take in your browser. Includes visual acuity with Landolt C rings (ISO 8596), near vision reading chart, astigmatism starburst, color vision plates, contrast sensitivity, Amsler grid for macular health, duochromatic balance, and peripheral visual field testing. Credit-card screen calibration plus a camera-free blind-spot test measure your real screen size and viewing distance, so optotypes are sized in true physical units — not guessed.
How to Take the Eye Test
Select your device type for optimized distance settings and input method.
Use a credit card (phone) or ruler (computer) to ensure optotypes are displayed at the correct physical size.
A quick blind-spot test (no camera needed) or your front camera measures how far you sit from the screen — no need to sit at an exact mark. Then maximize screen brightness.
Take each test covering acuity, near vision, astigmatism, color, contrast, Amsler grid, red-green balance, and visual field.
Get your Snellen equivalent, age-adjusted interpretation, per-test breakdown, and personalized recommendations.
Check your visual acuity, near vision, astigmatism, contrast sensitivity, and peripheral vision from any device
- A credit card or ruler for screen calibration
- A well-lit room with your screen at eye level
- Something to cover one eye (hand or paper)
- 8–15 minutes of uninterrupted time
Screening test — not a clinical diagnosis
Accurate calibration is essential for reliable results.
Why it matters: a 20/20 optotype is tiny and its correct size changes with distance — a wrong distance makes every acuity result wrong.
Keep the same distance throughout the entire test.
The eight checks and what each one looks for
The test takes about ten minutes and covers eight different things. Here is what each of them is actually looking at, so you know what you are agreeing to before you start.
| Check | What it looks for |
|---|---|
| Visual Acuity | Landolt rings with a gap: the smallest detail you can still tell apart. The result is given on the familiar Snellen scale. |
| Near Vision | The same at reading distance — this is what changes with age. Reported on the Jaeger scale. |
| Astigmatism Check | A radial figure: if some spokes look darker or sharper, the cornea refracts unevenly across its axes. |
| Color Vision | Digits hidden in colored dots — how well you separate red from green. |
| Contrast Sensitivity | The same symbols, but progressively paler: how you see in dusk, fog and rain. |
| Amsler Grid | A grid where you watch for waviness or gaps near the center — the classic sign of changes in the macula. |
| Red-Green Balance | Whether letters look equally sharp on red and on green — a rough hint that glasses are under- or over-corrected. |
| Visual Field | Whether you notice a mark appearing to the side without moving your gaze. |
What decides whether the numbers mean anything
- This is a screening, not a diagnosis: it tells you whether there is a reason to see a doctor, and does not replace an examination.
- Accuracy rests on two things you set yourself at the start — screen brightness and the distance to it. Move closer mid-test and the figures drift.
- Each eye is checked separately, with the other covered: a weaker eye is easy to miss when both are open, because the stronger one compensates.
