noun. The lens or lens group closest to the eye in an optical instrument; an ocular.

noun. In entomology, the eye-covering in the pupæ of lepidopterous insects.

noun. An eyepiece with right-angled reflection-prism attached to the eye-lens, so that the observer looks in at the side, perpendicularly to the axis of the instrument.

noun. In an optical instrument, the lens or combination of lenses to which the eye is applied.

noun. The lens, or combination of lenses, at the eye end of a microscope, telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed.

noun. See under Collimate.

noun. an eyepiece consisting of two plano-convex lenses with their curved surfaces turned toward the object glass, and separated from each other by about half the sum of their focal distances, the image viewed by the eye being formed between the two lenses. it was devised by Huyghens, who applied it to the telescope. Campani applied it to the microscope, whence it is sometimes called Campani's eyepiece.

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noun. an eyepiece consisting of two plano-convex lenses placed with their curved surfaces toward each other, and separated by a distance somewhat less than the focal distance of the one nearest eye, the image of the object viewed being beyond both lenses; -- called also, from the name of the inventor, Ramsden's eyepiece.

noun. an eyepiece used in telescopes for viewing terrestrial objects, consisting of three, or usually four, lenses, so arranged as to present the image of the object viewed in an erect position.

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noun. The lens (or combination of lenses) at the eye end of a microscope or telescope by which the image is viewed.

noun. combination of lenses at the viewing end of optical instruments

"Bent to the eyepiece was an old woman with long, black hair, wet as a well-used mop."

achromatic eyepiece  collimating eyepiece  comet eyepiece  compensating eyepiece  compound eyepiece  

erecting eyepiece  

lens  lens system  lense  

caliper  collimator  crosshair  diffuser  periscope  

ocular