Huygenian

An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes.

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Christiaan Huygens was one of the first astronomers to apply mathematical principles to the design of optics rather than trial and error, and his telescope could study Saturn's ring system. The Huygenian eyepiece he invented in the 17th century is still in use today