Bacon, Roger; Burke, Robert Belle, trans. (1962)
The Opus Majus of Roger Bacon (New York: Russell & Russell, Inc.) vol. 2. Part 5, Ch. IV, p. 582. From p. 582: „For we can so shape transparent bodies, and arrange them in such a way with respect to our sight and objects of vision, that the rays will be refracted and bent in any direction we desire, and under any angle, we wish we shall see the object near or at a distance. Thus from an incredible distance we might read the smallest letters and number grains of dust and sand …“
Grant, Edward, muh. (1974), A Source Book in Medieval Science, Cambridge, Massachusetts: Harvard University Press, 389-bet, ISBN9780674823600 From Grantʼs English translation of Robert Grossetesteʼs De Iride (On the rainbow) in Latin, p. 389: „This part [viz, from Aristotleʼs supposed treatise on optics] of perspective, if perfectly understood, shows us how to make nearby objects appear very small, and how to make a small object placed at a distance appear as large as we wish, so that it would be possible to read minute letters from incredible distances or count sand, seeds, blades of grass, or any minute objects.“
britannica.com
„Eyeglasses | optics“, Encyclopedia Britannica (inglizcha), qaraldi: 18 February 2021
„Rivet spectacles“, www.college-optometrists.org, The College of Optometrists, 2015, qaraldi: 28 February 2015
doi.org
Duarte, IA; Mde F, Hafner; Malvestiti, AA (2015), „Ultraviolet radiation emitted by lamps, TVs, tablets and computers: are there risks for the population?“, An Bras Dermatol, 90-jild, № 4, 595–7-bet, doi:10.1590/abd1806-4841.20153616, ISSN0365-0596, PMC4560556, PMID26375236
Duarte, IA; Mde F, Hafner; Malvestiti, AA (2015), „Ultraviolet radiation emitted by lamps, TVs, tablets and computers: are there risks for the population?“, An Bras Dermatol, 90-jild, № 4, 595–7-bet, doi:10.1590/abd1806-4841.20153616, ISSN0365-0596, PMC4560556, PMID26375236
Kriss, Timothy C; Kriss, Vesna Martich (April 1998), „History of the Operating Microscope: From Magnifying Glass to Microneurosurgery“, Neurosurgery, 42-jild, № 4, 899–907-bet, doi:10.1097/00006123-199804000-00116, PMID9574655
ncbi.nlm.nih.gov
Duarte, IA; Mde F, Hafner; Malvestiti, AA (2015), „Ultraviolet radiation emitted by lamps, TVs, tablets and computers: are there risks for the population?“, An Bras Dermatol, 90-jild, № 4, 595–7-bet, doi:10.1590/abd1806-4841.20153616, ISSN0365-0596, PMC4560556, PMID26375236
Duarte, IA; Mde F, Hafner; Malvestiti, AA (2015), „Ultraviolet radiation emitted by lamps, TVs, tablets and computers: are there risks for the population?“, An Bras Dermatol, 90-jild, № 4, 595–7-bet, doi:10.1590/abd1806-4841.20153616, ISSN0365-0596, PMC4560556, PMID26375236