Technology & Medicine › Medieval › Glassmaking
Eyeglasses
c. 1286 (Pisa)· Invention or discovery· Medicine & surgery
Mostly agreedGood evidence; some details, dates or numbers uncertain.
Convex glass lenses set in frames to help aging eyes read, first made in northern Italy around 1286.
See it on the Technology & Medicine map →How it works
Reading lenses appeared near Pisa in the 1280s; the inventor is unknown. Early pairs were two convex lenses in bone or metal rims, riveted together and perched on the nose, correcting the farsightedness that comes with age. Venice's glassmakers' guild regulated 'discs for the eyes' by 1300, and the first painting of spectacles dates to 1352. Concave lenses for nearsighted people followed in the 1400s. Frames with side arms over the ears came only in the 1700s.
Why it mattered
Eyeglasses added decades of close work to scribes, scholars and craftsmen whose near vision faded in their 40s, and the lens-grinding trade later produced the telescope and microscope.
Think of it like
Like a cheap retrofit that extends a building's useful life by decades: the same skilled worker, kept productive far longer.
How we know
A 1306 Florence sermon by friar Giordano da Pisa saying the art was 'not yet twenty years' old; Venetian guild rules; Tommaso da Modena's 1352 fresco in Treviso; frames found under the floor of Wienhausen convent, Germany.
Still unknown or debated
Who invented them is unknown. The tale crediting Salvino degli Armati of Florence rests on a later forgery, and claims of earlier Chinese spectacles lack evidence.
Connections (5)
▸Glassmaking supplied the clear glass for EyeglassesWell documented
The connection
Eyeglass lenses were ground and polished from clear glass, or sometimes rock crystal. Venice's glassmakers produced unusually clear glass by the late 1200s, and their guild soon regulated lens-making. Without clear, bubble-free glass, reading lenses would have been too cloudy to help.
When and how
Venice and Murano, and Pisa and Florence, in northern Italy, in the 1280s–1300s; Venice moved its glass furnaces to Murano island in 1291.
How we know
Venetian guild rules of about 1300 mention glass 'discs for the eyes' and ban selling glass lenses as rock crystal.
Debates and open questions
Whether the first lenses were glass or rock crystal, and whether they were first ground in Pisa or Venice, is not settled.
▸Eyeglasses led to the TelescopeMostly agreed
The connection
Spectacle makers spent three centuries learning to grind convex and concave lenses. In 1608 a Middelburg spectacle maker, Hans Lipperhey, put one of each in a tube and found distant objects looked about three times closer. The telescope came directly out of the eyeglass trade, which supplied both the lenses and the craftsmen.
When and how
Middelburg, the Netherlands, in 1608; Lipperhey and the other early claimants, Jacob Metius and Zacharias Janssen, all worked with lenses.
How sure are we?
The 1608 Dutch patent records describe Lipperhey as a spectacle maker, and the earliest telescopes used ordinary eyeglass-quality lenses.
Debates and open questions
Some suggest earlier lens combinations, such as Leonard Digges's in 1550s England, worked as telescopes; the evidence is thin.
▸Eyeglasses led to the MicroscopeMostly agreed
The connection
The same Dutch spectacle trade that produced the telescope also produced the microscope: lenses in a tube, arranged to enlarge something near rather than far. Single magnifying lenses had been used since eyeglasses appeared; combining two lenses gave much higher magnification.
When and how
The Netherlands, around 1590–1620, attributed to Middelburg spectacle makers such as Hans and Zacharias Janssen, and to Cornelis Drebbel in London.
How sure are we?
Early compound microscopes and writings from the 1620s treat them as lens-makers' devices; the timing and place match the spectacle trade.
Debates and open questions
Who first combined lenses this way is disputed, because the main claim for the Janssens came from testimony given decades later.
▸Ibn al-Haytham (Alhazen) and the Book of Optics laid the optical groundwork for EyeglassesMostly agreed
The connection
Ibn al-Haytham's Book of Optics showed that we see because light enters the eye, and analyzed how curved glass bends light and magnifies. Translated into Latin around 1200, it shaped European optics; Roger Bacon wrote in 1267 that a segment of a glass sphere could help weak eyes read. Spectacles appeared about 20 years later.
When and how
Cairo, around 1011–1021; the Latin translation, De aspectibus, circulated in Europe by about 1200; Bacon wrote in England and Paris in the 1260s.
How sure are we?
Bacon and other European optical writers cite Alhazen by name, but no record links him directly to the unknown craftsmen who made the first spectacles.
Debates and open questions
Whether spectacles came from optical theory at all, or from craftsmen's trial and error with polished reading stones, is debated.
▸Laser powers LASIK surgery, an alternative to EyeglassesWell documented
The connection
LASIK uses an ultraviolet 'excimer' laser to reshape the cornea, the clear front of the eye, so it focuses light correctly, doing the job glasses do. It suits many, though not all, nearsighted, farsighted and astigmatic people. Most still need reading glasses as they age.
When and how
IBM researchers in Yorktown Heights, New York, found in 1981 that excimer lasers etch tissue precisely; Ioannis Pallikaris developed LASIK in Crete, Greece, around 1990; US approval came in 1999.
How we know
FDA approval records and clinical trials document LASIK's results; tens of millions of procedures have been performed worldwide.
Debates and open questions
Results beyond 20 to 30 years, and side effects such as dry eye and night glare, are still studied; LASIK reduces eyeglass use rather than ending it.