Welcome to Optics Trade debates. In each episode, we talk about a different topic and try to answer the most common questions we receive about it. Today, we are going to talk about interpupillary distance.
The interpupillary distance is the distance between the centers of the eyepieces. It can be adjusted because most binoculars are foldable.
The minimum interpupillary distance is achieved when the binoculars are folded together, and the maximum when fully extended.
Correctly set interpupillary distance enables the user to see only one image with sharp edges.
In some binoculars, the interpupillary distance is too big, for some women or children that have their eyes naturally closer together. People with a short interpupillary distance can use a pocket or compact binoculars because they can be folded a lot better and have smaller lenses.
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Explanation of the term on our website:
The distance between each of an individual’s eyes or better pupils is called interpupillary distance. Most binoculars have an option of adapting the barrels to a specific position to ensure the whole image, either bringing them closer together or further apart. Normally this distance is somewhere between 58 and 75 mm. Often women and children have shorter interpupillary distances, so they must choose between compact binoculars.
The best practice is to try binoculars in person to get the feel of them and see if they suit you.