Hans and Zacharias Janssen are credited with the invention of the compound microscope in the late 16th century. While the exact details of their invention are disputed, they are generally acknowledged as the first to combine two lenses to create a microscope capable of magnifying objects significantly beyond what was possible with a single lens.

Their invention had a profound impact on science, as it:

* Enabled the observation of microscopic objects: Before the compound microscope, scientists could only see what was visible to the naked eye. This invention opened up a whole new world of microscopic organisms, cells, and structures.

* Advanced understanding of biology and medicine: The microscope allowed scientists to study the structure of plants, animals, and human tissues in greater detail, leading to advancements in anatomy, microbiology, and medicine.

* Paved the way for further optical advancements: The compound microscope served as a foundation for the development of more sophisticated microscopes, including the electron microscope.

While the exact attribution of the invention remains debated, the Janssen family's contribution to the development of the compound microscope is undeniable and marked a significant milestone in the history of science.