Macular Health / Monitoring
The Amsler Grid: Monitoring AMD at Home
The Amsler grid is a simple square chart that helps you catch changes in your central vision between eye exams. For people with AMD, a quick daily check can be the difference between catching wet AMD early, when it is most treatable, and missing it. Here is what the grid is and exactly how to use it.
Key Takeaways
- The Amsler grid is a free, at-home tool for spotting changes in your central vision.
- It is most useful for people with AMD or risk factors, and for watching the second eye when one eye already has wet AMD.
- Test one eye at a time, because your stronger eye can hide a change if both are open.
- Checking daily is ideal, and at minimum weekly, so you notice changes quickly.
- New wavy, blurry, dark, or missing areas are a warning sign that needs prompt attention.
- The grid is a supplement to regular eye exams, not a replacement for them.
Quick Answer: what is the Amsler grid?
The Amsler grid is a square chart of evenly spaced lines with a dot in the center. You wear your reading glasses, hold it at reading distance, cover one eye, and focus on the center dot. If any lines look wavy, blurry, dark, or missing, that is a sign to call your eye doctor. Used daily, it helps people with AMD catch changes early, especially the shift from dry to wet AMD, which is most treatable when caught quickly.
What the Amsler Grid Is
The Amsler grid looks like a piece of graph paper: a square filled with evenly spaced horizontal and vertical lines, with a single dot in the middle to focus on. Named for the Swiss eye doctor who created it, it is designed to reveal small changes in your central vision that are easy to miss in daily life. When the macula is healthy, the lines look straight and complete. When there is a problem, lines can appear bent, wavy, or broken, or parts of the grid can look dark or blank.
How to Use It, Step by Step
- Put on the reading glasses or near correction you normally use.
- Sit in a well-lit spot with steady, even light and no glare.
- Hold the grid at your normal reading distance, about 12 to 15 inches from your face, at eye level.
- Cover one eye completely with your hand. Do not peek with the covered eye.
- Look directly at the center dot with your open eye and keep your gaze fixed on it.
- Without moving your gaze, notice in your side vision whether all the lines look straight, even, and complete, including the edges and corners.
- Cover the other eye and repeat. Test each eye separately, every time.
Right after an eye exam, take a look at the grid so you know your normal baseline. That makes it easier to notice if something changes later.
What a Change Looks Like
You are watching for anything new compared with your baseline. Call your eye doctor promptly if you notice:
- Lines that look wavy, bent, or crooked.
- Lines that are blurry, faded, or hard to see.
- A dark, gray, or blank area anywhere on the grid.
- Missing corners, missing edges, or a hole near the center.
- Boxes that look different in size or shape across the grid.
The American Academy of Ophthalmology recommends using an Amsler grid every day to catch vision changes from AMD early, and to contact your eye doctor right away if lines look wavy, dark, or blank. Source: American Academy of Ophthalmology.
How Often, and Who Should Use It
Daily checking is the goal, and at least once a week is a sensible minimum. The Amsler grid is especially valuable if you have early or intermediate dry AMD, if you have risk factors such as a family history of AMD, a history of smoking, or older age, and if you already have wet AMD in one eye and need to watch the other. A good habit is to tape the grid somewhere you will see it daily, like the bathroom mirror or refrigerator. If you print one at home, print at full size, not fit-to-page, so the spacing stays accurate.
Dry Eye Rescue Tip
The single most common mistake is testing with both eyes open. Your stronger eye quietly fills in for the weaker one, so a real change can go completely unnoticed. Always cover one eye, check, then switch. It takes under a minute and it is the whole point of the test.
Find an Eye Doctor Near You
Home monitoring works best alongside regular exams and a baseline from your doctor. Dry Eye Rescue works with a network of over 5,000 eye care professionals. Use the Doctor Locator to find one near you, and call promptly if your grid changes.
Important Disclaimer
This page is educational and does not replace medical advice or an eye exam from your eye care professional. The Amsler grid is a home monitoring tool and is not a diagnosis. These statements have not been evaluated by the Food and Drug Administration, and any supplements referenced are not intended to diagnose, treat, cure, or prevent any disease. If you notice new or worsening changes in your central vision, contact your eye doctor promptly. Product and brand names referenced on this site are trademarks of their respective owners.
Frequently Asked Questions
What is the Amsler grid used for?
It is a home tool for checking your central vision. It helps people with AMD or risk factors notice small changes early, especially the shift from dry to wet AMD.
How do I use it?
Wear your reading glasses, hold the grid about 12 to 15 inches away in good light, cover one eye, focus on the center dot, and check whether the lines look straight and complete. Then test the other eye.
How often should I check it?
Daily is ideal, and at least weekly is a reasonable minimum. Frequent checks help you notice changes quickly.
What changes should I watch for?
Lines that look wavy, blurry, dark, or missing, or any new blank or distorted area compared with your usual view. Anything new is worth a call to your doctor.
Why do I have to cover one eye?
Because your stronger eye can compensate for the weaker one. With both eyes open, you can miss a real change. Testing one eye at a time is essential.
Where do I get an Amsler grid?
Your eye doctor can give you one, and many eye health organizations offer free printable versions. If you print one, use full size rather than fit-to-page so the spacing stays accurate.
Does the grid replace eye exams?
No. It is a supplement to regular dilated eye exams, not a replacement. Keep your scheduled visits even if your grid looks normal.
Who should use an Amsler grid?
People with early or intermediate dry AMD, those with risk factors like family history or a smoking history, and anyone with wet AMD in one eye monitoring the other.
What should I do if I notice a change?
Contact your eye doctor right away, since early treatment of wet AMD protects vision. Use the Dry Eye Rescue Doctor Locator to find a professional near you.
Make Home Monitoring a Daily Habit
Find an eye doctor for a baseline exam, shop macular support, or head back to the Macular Health guide for the full picture.
