"Two eyes are better than one", the old saying goes, but telescopes aren't exactly designed with this in mind. Humans are built for two-eyed viewing, and looking through a telescope with one eye can be surprisingly tiring. That's why many amateur astronomers turn to binoviewers. These devices can provide quite stunning views of the Moon, planets, and brighter deep-sky sights without causing fatigue and eyestrain. But to use a pair of binoviewers, you will need at least one pair of eyepieces. Choosing the best eyepieces for your binoviewers involves a few additional considerations that "one-eyed" observers don't need to think about. This guide will help you sort through the many options so you can select the most suitable eyepieces for your binoviewers, telescopes, and observing interests.

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