About this site

What it does

Amsler Grid Test draws a standard Amsler grid at its true size on your screen, lets you mark what you see for each eye, and keeps your past results on your device so that you can compare. It also has a printable grid, drawings of the common distortions and the seven original charts. Everything runs in your browser. There is no account, and nothing is for sale.

How the grid is drawn

The standard grid is 10 cm on each side with squares of 5 mm, read from 12 to 14 inches (30 to 35 cm). Screens differ in size, so the site asks you to match a bank card once. A standard card is 85.6 mm wide, which tells the page how large a millimeter is on your screen. On a screen narrower than 10 cm the squares keep their size and fewer of them are shown.

Where the facts come from

The instructions and the advice on when to call a doctor follow what the American Academy of Ophthalmology, the BrightFocus Foundation, the American Macular Degeneration Foundation, the Macular Society and Cleveland Clinic publish for patients, as read on 13 November 2026. Accuracy figures come from a 2023 analysis in JAMA Ophthalmology. The distortion drawings are illustrations made for this site.

What it is not

It is not an eye exam, a diagnosis or medical advice, and it is not a medical device. It can miss disease. See an eye doctor for regular exams and right away for any change in your vision.

Independence

The site is not affiliated with any of the organizations or products named on it. They are named as sources or for information. It is free to use and paid for by advertising.

Corrections

If you spot a mistake, please get in touch.