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

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

The compound lens at the end of the microscope-tube nearest the eye; it magnifies the image made by the lens at the other end, or the objective; see cut under microscope.