The use of the metric: mainly used to measure the vertex power (D) and prism power (△) of spectacle lenses (including contact lenses), determine the axial direction of the cylindrical lens of the cylindrical lens, print marks on the unprocessed lens and An instrument that checks that the lens is properly installed in the frame.

Focimeter Classification:

According to the display mode, the lens meter is divided into two types: continuous display type and digital display type.

According to the working principle, the focal meter is divided into two types: the focal meter based on the principle of focusing imaging and the focal meter based on the principle of autofocus; the focal meter based on the principle of focusing imaging is divided into visual type according to the different observation methods. and projection type.

The visual lens meter uses the reading telescopic system for observation; while the projection lens meter uses the projection objective lens and projection screen for observation; the lens meters used in the market mainly include automatic digital display, manual (digital display, direct Reading) Class Two Classes

The qualified application of the lens meter is directly related to the quality of the glasses assembly. During the processing, the lens meter is used to determine whether the lens power is accurate, determine the axial position and center position of the astigmatism, and then detect the degree, astigmatism degree and axis after the processing is completed. position and through the center position to determine whether the data of the pupil distance conform to the national standard for spectacles. The national spectacles fitting standard GB13511.1-2011 also has detailed requirements for the measurement of the focal meter. Mastering the application of the focal meter will help To improve our precision in fitting spectacle lenses.