what is abbe value
Different lenses have different properties. The density varies, known as index of refraction, and the ABBE VALUES are different for the various materials. The ABBE VALUE is a number given to describe the amount of chromatic aberration of an ophthalmic lens material. I've read messages from the list stating that their glass lenses seem to provide the best focus. Here is a list of ABBE VALUES. The higher the number, the less amount of aberration.