By chiseling a BOL on a surface of a lens, a apochromatic system is composed, which actualizes the system's apochromatism, as well as revising primary aberration.
医学百科 The Medicine Book (Big Ideas Simply Explained)
In the early 19th century, better quality achromatic microscopes created the new field of histology, the microscopic study of cells and tissues, which led to a number of neurological revelations.