How accurate is the Amsler grid?
Useful, free and worth doing, but far from perfect. Here is what the research says and what else is available.
Updated November 13, 2026 · General information, not medical advice.
What studies have found
A 2023 analysis in JAMA Ophthalmology combined ten studies covering 1,890 eyes. Compared with healthy eyes, the Amsler grid detected wet macular degeneration in about 67 out of 100 affected eyes, and correctly gave a normal result in about 99 out of 100 healthy eyes. When the comparison was with eyes that had dry macular degeneration, it detected about 71 out of 100 and was right about the unaffected eyes only 63 times out of 100.
In plain terms: an abnormal grid is a strong reason to be examined, and a normal grid is weak reassurance. The authors warned that the grid may give a false sense of security.
Why the grid misses things
- Filling-in. The brain completes regular patterns across small blind spots, so a gap can look like unbroken grid.
- Wandering eyes. It is hard to keep looking at the dot. When the eye moves, the affected area moves with it.
- No measurement. The result is your own impression, and it varies from day to day.
- Central vision only. The grid covers 10 degrees to each side of the center.
- Wrong size or distance. A grid that is too small or too far away covers less than it should.
- Stopping. Many people give up home testing after a few months.
Getting the most from it
- Use a grid at true size, at the same distance each time. See how to use an Amsler grid.
- Always test one eye at a time.
- Record each result so that you compare with a record and not with memory. The online test does this for you.
- Treat any doubt as a change and call your eye doctor.
- Never skip an eye exam because the grid looks normal.
Alternatives and additions
| Option | What it is | How you get it |
|---|---|---|
| ForeseeHome | A home device that tests for distortion with a different method (preferential hyperacuity perimetry) and reports to a monitoring center | Prescribed by an eye doctor, for intermediate dry macular degeneration |
| Home OCT (Scanly) | A home retinal scanner, authorized by the FDA in 2024 | Prescribed, for eyes already diagnosed with wet macular degeneration |
| Monitoring apps | Phone apps with distortion tests cleared by the FDA, such as Alleye and myVisionTrack | Usually prescribed |
| OCT scan in the clinic | A picture of the layers of the retina that shows fluid directly | At your eye exam |
In the trial of the ForeseeHome device, people who used it had better vision when wet macular degeneration was found than people who relied on their usual care. These options cost more and need a prescription, so ask your eye doctor whether your risk justifies one.
So is the Amsler grid still worth doing?
Yes. It is free, takes a minute and does catch many changes. Use it as one layer of protection, along with regular exams and attention to your everyday vision, and not as the only one.