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| 14th century || Spectacles are first made in {{w|Italy}}.<ref name="History of Microscopes">{{cite web |title=History of Microscopes |url=https://www.microscope.com/education-center/microscopes-101/history-of-microscopes/ |website=microscope.com |accessdate=14 January 2019}}</ref>
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| 17th century || Before the century, almose no one suspected there was life too small to see with the naked eye, with fleas thought to be the smallest possible form of life.<ref name="The Science Book: Big Ideas Simply Explained"/> {{w|Johannes Kepler}} is generally considered by neuroscentists as the first to recognize that images are projected, inverted and reversed by the eye's lens onto the {{w|retina}}.<ref name="Visual Approaches to Cognitive Education With Technology Integration"/> "Then, in By the mid 17th century, an Englishman, {{w|Robert Hooke }} and a Dutchman, {{w|Anthony Van Leeuwenhoek took }} take the microscope to new levels"of development.<ref name="History of Microscopes"/>
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| 18th century || Looking through lenses becomes very popular, with many having a microscope when able to afford.<ref name="BiologyBiology"/>
