The lens or group of lenses that is closest to the eye in a microscope, telescope, or other optical instrument
An eyepiece consisting of two planoconvex lenses with their plane side towards the observer.
An eyepiece of an optical instrument consisting of two planoconvex lenses with their convex sides facing each other.
A simple eyepiece consisting of two separate planoconvex lenses, used chiefly in refracting telescopes of long focal length
A scale of measurement inside an eyepiece that can be viewed at the same time as the image, on which it appears superimposed; an eyepiece incorporating such a scale.
An eyepiece (for a telescope, microscope, or other optical instrument) that contains a micrometer.
Having or producing normal vision; yielding an image free from optical distortion; specifically of binocular vision: without the reversal of convexity and concavity produced by pseudoscopic instruments.