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The optical lens itself is designed to focus the headlamp pattern on a screen. At the top of the lens mounting column is typically a mirror or laser which allows the headlight tester to be aligned with the longitudinal axis of the presented vehicle. Detail of the aiming screen target used to measure headlamp alignment.
The lensmeter is also used to check the accuracy of progressive lenses, and is often capable of marking the lens center and various other measurements critical to proper performance of the lens. It may also be used prior to an eye examination to obtain the last prescription the patient was given, in order to expedite the subsequent examination.
Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing the power of the lens relative to ...
For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens.For a converging lens (for example a convex lens), the focal length is positive and is the distance at which a beam of collimated light will be focused to a single spot.
A spherical lens or mirror surface has a center of curvature located either along or decentered from the system local optical axis. The vertex of the lens surface is located on the local optical axis. The distance from the vertex to the center of curvature is the radius of curvature of the surface.
Spectrometer or monochromator for generating or measuring a portion of the optical spectrum, for the purpose of chemical or material analysis; Autocollimator which is used to measure angular deflections; Vertometer which is used to determine refractive power of lenses such as glasses, contact lenses and magnifier lens
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