What was the impact of Leeuwenhoek's contribution?

Antony van Leeuwenhoek (1632-1723) was a Dutch scientist. He designed microscopes that could magnify up to 200 times. These enabled him to discover bacteria, protists, sperm cells, blood cells and many more microscopic features of living cells or micro-organisms. His discoveries were important milestones in the field of Biology. He did not invent the microscope, but his inquiring mind, astute observations and his keen mind were all the more impressive as he was not educated as a scientist.