Amsler grid test for checking central vision

What the Amsler Grid Test Shows

The macula is located in the central part of the retina and is responsible for clear central vision, which is necessary for reading, recognizing faces, and seeing fine details. When changes occur in the macular region, straight lines may appear wavy or distorted, and certain areas of the image may look blurry, darkened, or missing entirely.

The Amsler grid helps detect these subjective changes between routine eye exams. However, a normal result does not rule out disease: early and intermediate age-related macular degeneration can occur without noticeable symptoms. Diagnosis requires an examination by an ophthalmologist, who will order additional tests if necessary.

How to Take the Test Properly

Perform the test in good, even lighting. If you normally use reading glasses or contact lenses, wear your usual correction during the test. Position the grid at a normal reading distance, approximately 30–40 cm (12–16 inches) from your eyes.

Cover one eye with your palm without applying pressure. With the other eye, look directly at the point in the center of the grid, avoiding moving your gaze to individual squares. While maintaining your focus on the central point, evaluate the lines and squares across the entire grid. Then repeat the process for the second eye.

Amsler Grid

During the test, pay attention to the following:

• whether all horizontal and vertical lines remain straight;

• whether all squares look equal in size and shape;

• whether there are any areas where lines disappear, blur, or darken;

• whether any new wavy, curved, or broken lines have appeared;

• whether you perceive the grid identically with each eye individually.

What the Results May Look Like

Under normal perception, the grid lines remain straight and continuous, and the squares appear roughly identical. If the central lines become wavy, part of the grid disappears, or a new gray, blurry, or dark spot appears, you should consult an ophthalmologist. The illustration below demonstrates only a possible type of subjective distortion and does not represent a specific diagnosis.

What to Do If Lines Appear Distorted

Any new curvature of straight lines, a gray or blurry spot in the center of your vision, loss of part of the image, or a noticeable change in your usual vision requires an evaluation by an ophthalmologist. If these symptoms appear suddenly, you should not delay your visit.

During the consultation, the doctor will evaluate your symptoms and examine the fundus. Depending on the clinical situation, optical coherence tomography (OCT) and other investigations may be required to clarify changes in the macular region. You should not attempt to determine the form of the condition or choose treatment on your own using the grid.

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Can a normal Amsler grid result rule out macular disease?

No. In the early stages of age-related macular degeneration, there may be no noticeable symptoms. Therefore, straight lines on the Amsler grid do not confirm the absence of disease and do not replace routine eye exams, especially if an ophthalmologist has already detected retinal changes or recommended observation.

How often should you perform the test?

The frequency of self-monitoring depends on the reason for observation. For patients with age-related macular degeneration, an ophthalmologist may recommend regular checks, including daily testing. If your doctor has specified a different schedule, you should follow their recommendations.
If you already have diagnosed changes, it is helpful to compare the current result with the baseline appearance for each eye separately. The main focus is the appearance of new distortions, dark spots, or missing areas in your vision.

Limitations of the online test

On a screen, the size of the grid depends on the device's screen size, browser scale, and display settings. Therefore, the online version is primarily suitable for rough self-monitoring of central vision changes. It is not a diagnostic test and does not replace a fundus examination or other diagnostic methods.