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A round lens refers to a lens shape that is perfectly or nearly circular. A type of lens that has a circular shape, characterized by equal curvature on all sides, creating a soft, symmetrical, and retro-inspired look.

Round Lens

It follows a machine activity for direct tracing without handling the frame or the lenses individually . In turn, the tracing is completed on the foundations of the certain values.

Tracing–Lens Precision For All Frames

It is denoted by mm and is often included in the "3" values found at the inner side of the temples. The first one is the "optical lens diameter". It provides a correct value to the entire lens capacity of the frames and helps in making the lenses with an accurate size (width and height included)

Calculating The Optical Lens Diameter

Elliptical lens, in comparison with the round shape, represents a distinction in its original shape. It means the elliptical shape is not round and follows different diametric values for lenses.

Elliptical Lens Shape

Optical center is the center of the vision range that is used the most by your eyes and interacts with the light entering your eyes. On the surface, it is the
point placed on the principal axis of your lenses and it directly corresponds with your eye movement and bringing clarity to your vision.

Optical Center

The importance of having the right optical center points on the lenses is that it enables us to see the image sharply & vividly without letting the light deviate to other points of the vision. It is also known as the geometrical center of the lenses.

Importance

This point determines if the lens carries a
prism point at the time of manufacturing
the lenses. It is included in the verification
marks. It is usually 2 to mm below; where
the fitting cross exists on the lens.