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! Time period !! Development summary
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| 13th century || The development of lenses in {{w|eyeglasses}} probably leads to the wide spread use of simple microscopes (single lens {{w|magnifying glass}}es) with limited magnification.<ref>Atti Della Fondazione Giorgio Ronchi E Contributi Dell'Istituto Nazionale Di Ottica, Volume 30, La Fondazione-1975, page 554</ref>"<ref name="History of Microscopes"/>
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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>
