👉 An aspheric object is an object that has a spherical shape but also possesses an axis of symmetry (or axis of inversion) through its center. Aspheric objects can be categorized into three types based on their symmetry properties:
1.
Cylindric
: The shape is similar to a cylinder, and the symmetry axis is parallel to the diameter. Examples include spheres, cones, and cylinders.
2.
Conical
: The shape is similar to a cone, but instead of being perpendicular