Free in your browser
Free tools
Demos, generators, printables, and calculators. They’re free, they work on any device, and none of them is an eye exam.
Gabor patch tools
Gabor patches are the striped patterns vision scientists use to study how the brain handles contrast. Try the tasks in your browser, make your own patches, or print them.
Gabor patch generator
Change a patch’s angle, stripe spacing, contrast, and size, and watch it update.
Orientation demo
Spot the patch tilted at a different angle: a short browser version of an orientation task.
Contrast demo
Find the faint patch: a short browser version of a contrast-detection task.
Spatial-frequency demo
Tell fine stripes from coarse ones: a short browser version of a spatial-frequency task.
Printable Gabor patches
A free PDF with orientation, contrast, and stripe-spacing sheets.
Gabor filter demo
Upload an image and see how Gabor filters split it into orientations and stripe sizes.
60-second contrast demo
Find the faintest striped pattern you can spot on your screen. Not an eye exam.
Reading and screen demos
Short demos and calculators about near vision, reading glasses, and screen habits. They are practice and education, not eye exams.
Tumbling E demo
A 60-second Tumbling E practice at reading distance. Practice, not an eye exam.
Reading glasses strength
Typical starting reader strength by age, with a strength chart. Educational, not a prescription.
Screen habits check
Compare your screen habits with common advice on breaks, distance, lighting, and text size.
Quizzes
Check what you know about eye-exercise claims.