Visual Acuity

Exercises targeting sharpness, contrast sensitivity, astigmatism awareness, and color discrimination. Sit at a normal screen distance and use your natural (or corrected) vision.

Letter Chart
A Snellen-inspired chart with rows of letters that shrink each level. Identify the letters to find your screen acuity limit.
Sharpness 8 levels
Contrast Sensitivity
A letter appears at progressively lower contrast against the background. Find the threshold where you can no longer reliably identify it.
Contrast Adaptive
Astigmatism Check
A sunburst of lines radiates from center. In astigmatic eyes, some axes appear bolder or sharper than others. Tap the lines that look clearest.
Axis awareness Self-check
Color Discrimination
Two color patches appear side by side — same or different? The differences shrink each round, testing the limits of your color perception.
Color vision 20 rounds
Not a medical test. These exercises give a rough sense of your visual performance on screen. They are not a substitute for a professional eye examination. If you notice significant changes in your vision, see an optometrist.