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1300s: Spectacles are used for the first time
1300
1590: Hans and Zacharias Janssen invent microscope
1590
1667: Robert Hooke discovers cells with a microscope
1667
1675: A. van Leeuwenhoek uses microscope to look at insects and other things
1675
18th century: Microscopes improve and become more popular among scientists
1700
1903: Richard Zsigmondy invents ultramicroscope
1903
1932: Phase-contrast microscope developed by Frits Zernike
1932
1938: Ernst Ruska invents the electron microscope
1938
1981: G. Binnig and H. Rohrer invent the scanning tunneling microscope
1981
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