Amsler Grid Test: A Simple At-Home Tool to Monitor Changes in Your Central Vision

Amsler Grid Test: A Simple At-Home Tool to Monitor Changes in Your Central Vision

Protecting your vision starts with paying attention to small changes—and the Amsler grid is one of the simplest tools you can use at home to do exactly that. This quick test helps you notice distortions or blank spots that may indicate changes in the macula, the part of the eye responsible for sharp, central vision.

It takes less than one minute, requires no equipment other than the grid itself, and can be done regularly to support your eye-care routine.

What Is the Amsler Grid?

The Amsler grid is a square filled with straight horizontal and vertical lines, with a dot in the center. When viewed correctly, these lines should appear straight, evenly spaced, and uninterrupted.

If any part of the grid looks wavy, blurry, missing, or distorted, it may signal that something in your central vision has changed, and you should contact an eye-care professional.

⭐ The Most Important Rule: Test ONE Eye at a Time

Many people make the mistake of looking at the grid with both eyes open—but doing so can hide early problems.

Your brain is incredibly good at compensating. If one eye has a weak area, the other eye can “fill in” the missing information. When both eyes are open, this compensation can mask early visual changes.

This is why the Amsler grid must always be performed with one eye covered.
Testing each eye individually allows you to notice changes that you would otherwise miss.

Step-by-Step Instructions for Using the Amsler Grid

Follow these steps for the most accurate results:

1. Wear your reading glasses if you normally use them.

The test is designed for near vision.

2. Hold the grid at normal reading distance (about 12–14 inches / 30–35 cm).

Make sure the lighting in the room is bright and even.

3. Cover one eye with your hand.

Do not close both eyes or squint—the goal is to isolate the vision in the eye being tested.

4. Focus on the dot in the center of the grid.

Keep your eyes steady on this central point throughout the test.

5. While looking at the dot, observe the entire grid.

Ask yourself:

• Do all the lines look straight?
• Are any lines wavy, blurry, or distorted?
• Is any section missing, faded, or dark?
• Does the center look different from the edges?

6. Repeat the test with the other eye.

This step is critical.
Each eye must be tested independently; your brain cannot compensate when one eye is fully covered.

7. Record any changes and contact an eye-care professional if something seems different.

Even small changes should be noted, especially if they are new.

How Often Should You Use the Amsler Grid?

Many eye-care providers recommend checking daily or weekly, especially for individuals monitoring their macular health. Frequent testing helps you notice subtle changes more quickly.

Why the Amsler Grid Matters

The Amsler grid gives you a simple, accessible way to stay proactive about your vision. Because macular changes can develop gradually, early detection can make a meaningful difference in how quickly you seek professional care.

By taking just one minute to test each eye separately, you give yourself the best chance to notice small changes early.