An eyepiece is an optical device that is used to magnify the image of an object. It is composed of several components, including an OPTIC, OCULAR, LENS, and uvea. The OPTIC is a curved piece of glass that is used to refract light. The OCULAR is a tube-like structure that contains the LENS. The LENS is a curved piece of glass that focuses the light onto the uvea, which is a layer of tissue that covers the back of the eye. Together, these components work together to magnify the image of an object.