Not everyone’s eyes have the same level of acuity. This can create a problem when looking through binoculars. To compensate for the sight difference between users, high quality binoculars have a feature called diopter adjustment. This means that you can adjust the acuity of each of the binocular barrels so they are in the correct relation to each other and your eyes. Many people do not even realize that their binoculars have a diopter adjustment until they accidentally change the settings. When this happens, then the two barrels won’t be able to focus on the same object at the same moment.
There is usually a central diopter adjustment knob which is used to focus both of the binocular barrels simultaneously. If your eyes have different acuities (which is surprisingly very common), then you will need to adjust each of the barrels separately. When setting the diopter adjustment manually, you should always begin with it at 0, which is usually in the center. You should then blackout the barrel which will be affected by the diopter adjustment (typically the right side). Look through the binoculars at something in a mid-range distance and turn the knobs until the object becomes a clear image. Make sure you aren’t squinting because this will change the focus. Once the diopter is adjusted for one eye, then you can adjust the diopter for the other eye in the same way. A lot of the modern, advanced binoculars will have an automatic diopter setting which adjusts to your individual vision, even if your eyes are two different acuities.
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