Free 3-minute screening • Track changes over time
Vision after a concussion
A free, calibrated contrast sensitivity screening test. Three minutes, no signup, results stay on your device.
Take the testFree • 3 minutes • No signup • Phone, tablet, or laptop.
Why this test, for concussion recovery.
Mild traumatic brain injury commonly leaves subtle visual changes — blur, light sensitivity, trouble reading text on a screen — that pass a standard 20/20 acuity exam without comment.
Mid-spatial-frequency contrast sensitivity often shows changes when standard tests don't. Repeated measures during recovery are more useful than a single number — patterns over weeks tell a different story than any one session.
Take the test now, then retake at one week, four weeks, and three months. Bring the trend (not just one chart) to a neuro-optometrist or your primary care visit.
What this test can and can’t tell you.
It can
- Surface mid-frequency contrast changes that a standard acuity test wouldn’t catch.
- Track recovery — or persistent symptoms — over weeks and months.
- Provide curve and trend data for a neuro-optometric specialist.
It can’t
- Diagnose concussion or post-concussion syndrome.
- Replace a comprehensive neuro-optometric evaluation.
- Beat single-session variance — trends across tests matter more than any one number.
The longer read.
We’ve written about this in depth — with citations and a “what the science says vs. what we don’t know” section.
Vision changes after a concussion: when CSF tells you something→Take the test
Free, 3 min. No signup. Results stay on your device.