What Is Base In Sunglasses?
by BrightDr. on Aug 02, 2022
Rim curvature, refers to the curvature of the frame edge of the eyeglass frame mounting lens, that is, the curvature of the rim. Usually optical frames are designed in the curvature of the rim between 2 base to 6 base, only sunglasses may be greater than 6 base, even up to 8 base or 9 base, which requires custom lenses and must be tried on to adapt.
The impact of the curvature of the rim.
The ideal curvature of the rim should match the curvature of the front surface of the lens (convex surface), which is the necessary basis for a solid and beautiful assembly. If the curvature of the rim does not match well with the curvature of the lens, the lens will not be mounted smoothly and firmly in the rim, which can easily cause the lens to fall off or generate stresses that can easily damage the lens; when the lens is deeper and has a larger edge thickness, it can affect the aesthetics. Excessive rim curvature will also cause the frame surface bending.
Therefore, one of the important elements of the assembly and adjustment of glasses is to make reasonable adjustment of the curvature of the rim according to the corresponding curvature of the front surface of the lens, to ensure that the contour shape and curvature of the frame frame and the contour shape and curvature of the lens match; when the left and right luminosity is different, it should also try to keep the consistency of the left and right rim after adjustment.