Overview
Eyeglasses emerged in late-thirteenth-century Italy, but their inventor remains unknown. Dominican testimony from Pisa and Florence, Venetian guild records and early artworks reveal how spectacles moved from a guarded invention to one of medieval Europe’s most transformative everyday technologies.
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The Invention of Eyeglasses: Pisa, Venice and a Medieval Mystery
Few inventions have become as ordinary as eyeglasses. They sit on bedside tables, disappear beneath piles of books and are pushed absent-mindedly back up the nose. Yet behind this familiar object lies one of the more intriguing mysteries of medieval technology.
We know roughly when spectacles appeared. We can identify the Italian cities where the earliest evidence clusters. We have the testimony of a Dominican friar who claimed to have spoken personally with the inventor. We even possess Venetian regulations showing that, within little more than a decade, spectacles had become commercial products.
What we do not have is the inventor’s name. The evidence points most strongly towards Pisa and Tuscany in the 1280s, while Venice possesses a serious rival claim because of its sophisticated glass industry and remarkably early records of spectacle manufacture. Florence, meanwhile, acquired its own supposed inventor centuries later — only for that story to collapse under historical scrutiny.
The invention of eyeglasses is therefore not the story of a single medieval genius emerging neatly from the archives. It is a story of anonymous craftsmen, travelling friars, glassworkers, trade secrets and competing civic traditions. Above all, it shows how rapidly a practical idea could travel through medieval Europe once people realised how useful it was.
Before Eyeglasses: The Lens Was Already Known
The inventor of spectacles did not invent the magnifying lens. Convex lenses and reading stones were known before the late thirteenth century. Roger Bacon’s Perspectiva, written during the thirteenth century, discussed the usefulness of magnifying lenses for reading. The optical properties required for spectacles were therefore not a sudden scientific discovery. Vincent Ilardi goes further, arguing that formal optical theory probably played little direct part in the actual invention.
The breakthrough was simpler, but enormously important: take two suitable lenses, mount them separately, join their frames and position them directly in front of both eyes.
Early spectacles were very different from modern glasses. The first widely accepted form consisted of two convex lenses in individual frames, connected by a central rivet. There were no arms running back towards the ears. The frames rested or pinched around the nose and could also be steadied by hand.
Their convex lenses were useful particularly for presbyopia, the deterioration of near vision that commonly accompanies age. For monks, clerks, merchants, scribes, scholars and craftsmen whose livelihood depended upon close work, that was no minor convenience. Age no longer necessarily meant surrendering the ability to read a manuscript, examine accounts or work on something small and intricate. The unanswered question is who first joined those two lenses together.
Giordano da Pisa and the Man Who Invented Spectacles
The most remarkable evidence comes from Giordano da Pisa, also known as Giordano da Rivalto, a Dominican preacher with strong connections to the convent of Santa Caterina in Pisa.
Giordano’s Quaresimale fiorentino preserves ninety-two sermons delivered in Florence between February 1305 and April 1306. The critical edition prepared by Carlo Delcorno draws upon a substantial manuscript tradition, making Giordano’s testimony much more valuable than a legend written centuries after the event.
On 23 February 1306, while preaching in Florence, Giordano referred to the invention of spectacles. According to the surviving sermon, the art of making them had been discovered less than twenty years earlier. Even more tantalisingly, Giordano claimed personal acquaintance with the person responsible.
“I saw the one who first discovered and practiced it, and I talked to him.”
— Giordano da Pisa, sermon of 23 February 1306, translated in Vincent Ilardi, Renaissance Vision: From Spectacles to Telescopes.
That single sentence is extraordinarily important. Giordano was not writing two centuries afterwards. He was speaking within living memory of the invention and claimed to have met its creator. If his dating was reasonably accurate, spectacles appeared sometime after about 1286, probably during the later 1280s or early 1290s.
Vincent Ilardi, whose Renaissance Vision: From Spectacles to Telescopes remains one of the fullest studies of the subject, favoured a date around 1286. Edward Rosen, whose classic 1956 study reconstructed the early evidence in considerable detail, reached a broadly similar conclusion.
What Giordano Does Not Tell Us
For all its importance, Giordano’s sermon does not name the inventor. Nor does the surviving passage explicitly say that spectacles were invented in Pisa. Giordano was preaching in Florence, and an incautious reading of the sermon can make the Pisan attribution appear stronger than the document itself warrants.
The Pisan case instead comes from placing Giordano’s testimony beside other evidence. He had entered the Dominican community at Santa Caterina in Pisa, later studied and travelled elsewhere, and remained part of the highly mobile Dominican intellectual world. Ilardi regarded Giordano’s movements as an additional clue favouring Pisa, but a clue is not proof. Medieval friars travelled, craftsmen migrated, and technical knowledge crossed political boundaries remarkably easily. Fortunately, another Pisan Dominican brings us closer to the workshop in which early spectacles were being made.
Alessandro della Spina and a Medieval Trade Secret
The Chronica antiqua conventus Sanctae Catharinae de Pisis, the chronicle of the Dominican convent of Santa Caterina in Pisa, records the death in 1313 of Friar Alessandro della Spina. Its brief account of him is one of the central sources for the history of spectacles.
Spina is described as an unusually capable craftsman who could reproduce things he had seen others make. The chronicle then explains that spectacles had first been made by someone else, who had been unwilling to communicate the method. Spina nevertheless discovered how to make them and willingly shared what he had learned. The Latin refers to the objects as ocularia. That distinction is crucial.
Alessandro della Spina was not identified by the chronicle as the original inventor. Quite the opposite: the text explicitly places another, unnamed maker before him. What Spina appears to have done was reproduce the invention and break whatever secrecy surrounded its manufacture.
The Dominican historian Emilio Panella, in his examination of Spina and the Pisan material, has drawn renewed attention to this manuscript tradition and the documentary context surrounding Santa Caterina.
An Invention That Someone Wanted to Keep Secret
The passage offers a rare glimpse into the culture of medieval craftsmanship. Technical knowledge could have commercial value. Recipes, manufacturing processes and workshop skills were not automatically published for the benefit of posterity. Craftsmen learned by observation, apprenticeship, imitation and practice. A maker who had discovered a profitable technique had every reason to protect it.
If the Chronica antiqua accurately preserves the circumstances surrounding the first spectacles, the unknown inventor may have attempted precisely that. Spina’s role was almost the opposite. He reproduced the device and shared the method.
That helps explain why spectacles could move quickly from novelty to manufacture. Monasteries were not isolated from technological exchange. Dominican communities formed an international network of educated men who moved between Pisa, Florence, Bologna, Paris, Avignon and other centres. Ilardi argues that such mobility could have helped disseminate knowledge of spectacles alongside the movements of craftsmen and merchants. Yet while Pisa supplies the most intriguing human testimony, Venice supplies something different: the records of an industry.
Venice Turns Spectacles into a Commercial Product
Nicolò di Rouen, fotografia da gigantografia; dal ciclo della Sala Capitolare (attualmente in restauro) nel Convento dei Domenicani di Treviso; Museo dell’Occhiale, Pieve di Cadore
Venice’s claim begins with glass. By the late thirteenth century, Venetian glassworkers already possessed highly developed skills, and the city’s authorities were deeply concerned with regulating their trade. Glass that resembled more valuable rock crystal created an obvious problem: customers could be deceived.
An addition made on 2 April 1300 to the regulations governing Venetian crystal workers prohibited the dishonest sale of clear glass as crystal. Among the products listed were roidi de botacelis et da ogli — discs for vials and for the eyes — alongside lapides ad legendum, or reading stones.
The distinction is important. Reading stones were already-established magnifiers placed over or near text. The roidi da ogli, by contrast, were associated directly with the eyes.
Then came an even clearer document. On 15 June 1301, Venetian regulations permitted the manufacture of vitreos ab oculis ad legendum — literally, glass objects for the eyes used for reading. Anyone wishing to make them could do so, provided they swore to sell glass as glass rather than misrepresenting it as crystal.
The regulations survive through the Capitolari delle arti veneziane, later edited by Giovanni Monticolo and Enrico Besta from the records of the Venetian authorities. The documents leave little doubt that by 1300–1301 spectacles were no longer merely an experimental curiosity. They were being manufactured, sold and regulated.
Why the Venetian Evidence Is So Important
The Venetian documents are tantalising because they appear so close to the probable date of invention. Ilardi observed that if the reference of 1300 had been dated before 1286, Venice would possess an exceptionally strong — perhaps decisive — priority claim. Instead, Giordano’s later testimony points backwards to an invention already made roughly fourteen years before the surviving Venetian regulation. That does not eliminate Venice.
Venetian glassworkers travelled. Foreign craftsmen, including Tuscans, worked in Venice and Murano. Florentine merchants were deeply involved in Venetian commerce, while Venetian glassmaking expertise circulated elsewhere in Italy. Ilardi stresses that this constant exchange makes attempts to locate a technological invention within rigid civic boundaries hazardous.
A Venetian craftsman could theoretically have carried the idea to Tuscany. A Tuscan could have learned glassworking techniques in Venice. Spectacles might even have developed through several stages rather than one dramatic moment.
Venetian historian Luigi Zecchin therefore advanced versions of a Venetian hypothesis, including the possibility that the decisive development arose among the cristalleri. Ilardi took those arguments seriously but concluded that the necessary documentation for Venetian priority was lacking.
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Pisa or Venice: Where Were Eyeglasses Invented?
The evidence can be reduced to a fairly clear distinction. Pisa has the stronger evidence for the invention itself. Venice has the strongest very early evidence for organised manufacture and commerce.
The Pisan case rests upon Giordano’s testimony and the Chronica antiqua. Giordano said that the invention was less than twenty years old in 1306 and that he had spoken to its inventor. The Pisan chronicle then places Alessandro della Spina in the same Dominican environment, reproducing spectacles originally made by someone who wished to keep their manufacture secret.
The Venetian evidence begins with surviving commercial regulation in 1300–1301. It is exceptionally early, but it describes an object that appears already to have entered production.
There is even a linguistic clue. Giordano used the Tuscan occhiali, while the Pisan chronicle used the Latinised ocularia. The Tuscan terminology subsequently became normal elsewhere in Italy, including Venice. Ilardi regarded this as suggestive because medieval products sometimes retained terminology associated with their place of origin, although he sensibly warned that the explanation might simply be linguistic convenience.
His final judgement therefore remained cautious. Ilardi wrote that a Pisan origin had not been seriously overturned, but acknowledged that it could not be considered certain. He approvingly cited Rosen’s conclusion:
“Pisa has a better claim on him than any other locality.”
— Edward Rosen, The Invention of Eyeglasses (1956), quoted by Ilardi.
That is probably the most defensible conclusion. The surviving evidence points most strongly towards Pisa, or its immediate Tuscan environment, around the later 1280s. Venice remains a plausible rival and was unquestionably one of the earliest centres of spectacle production. The inventor himself remains unknown.
Salvino degli Armati: The Inventor Who Never Was
For generations, histories of spectacles repeated the name of Salvino degli Armati, a Florentine who was said to have invented eyeglasses.
The claim ultimately rested on evidence that appeared long after the supposed invention.
In 1684, the Florentine writer Ferdinando Leopoldo del Migliore reported the existence of a burial record from Santa Maria Maggiore in Florence supposedly identifying Salvino as the inventor of spectacles. The inscription associated with the tradition also gave the story an appealing precision: Florence had its inventor, his name was known, and his achievement could apparently be commemorated at his tomb.
The documentary foundation, however, did not withstand scrutiny.
In 1920, the historian Isidoro del Lungo published Le vicende d’un’impostura erudita (Salvino degli Armati) and demonstrated serious chronological, linguistic and documentary problems in the tradition. The supposed evidence could not be treated as a reliable medieval record.
Ilardi later revisited the case and agreed that Salvino degli Armati could not be accepted as the inventor of spectacles.
The episode matters because it shows how easily a historical vacuum can be filled by later tradition. The genuine thirteenth- and early fourteenth-century evidence gives us an invention but no name. Later writers supplied one.
For the history of spectacles, however, the safest conclusion remains straightforward: there is no reliable contemporary evidence identifying Salvino degli Armati as their inventor.
The First Eyeglasses in Medieval Art
Fra Ugone di Provenza. Sala Capitolare del Convento dei Domenicani, Chiesa di San Nicolò, Treviso
Written evidence tells us that spectacles existed. Art provides a different kind of evidence.
The most famous early representation appears in Treviso in 1352, several decades after the probable date of invention.
Tommaso da Modena decorated the chapter house of the Dominican monastery of San Nicolò with a series of forty Dominican figures engaged in scholarly work. Books, writing desks and reading aids appear throughout the cycle.
Among them is Hugh of Saint-Cher, often called Ugo di Provenza in Italian sources, wearing a pair of centrally riveted spectacles. The fresco is widely regarded as the earliest known artistic representation of spectacles. Franz Daxecker’s study of the paintings identifies several forms of reading aid within Tommaso’s Dominican cycle, including rivet spectacles and a magnifying lens. There is, however, an obvious chronological difficulty. Hugh of Saint-Cher died in 1263.
He therefore died roughly two decades before the period in which Giordano da Pisa’s testimony places the invention of spectacles. Tommaso painted him almost ninety years after his death. The image cannot therefore be used straightforwardly as evidence that Hugh himself wore spectacles.
An Anachronism, Not an Earlier Date for the Invention
The simplest explanation is that Tommaso represented Hugh using an object familiar to the painter’s own fourteenth-century world.
By 1352, spectacles were sufficiently established to appear naturally among the equipment associated with reading and scholarly work. Their presence in the fresco is therefore better treated as an anachronistic attribute than as evidence that spectacles existed before the 1280s.
It is reasonable to associate their inclusion with Hugh’s reputation for learning, but the precise intention behind Tommaso’s choice cannot be recovered with certainty.
What the fresco does establish is more limited, but still important: by the middle of the fourteenth century, spectacles had become recognisable enough to appear prominently in an Italian Dominican programme devoted to scholarship.
It is a striking sign of how quickly the invention had entered medieval visual culture.
From Tuscany and the Veneto to the Rest of Europe
The earliest history of spectacles is dominated by Tuscany and the Veneto, but the device did not remain Italian for long.
Dominican networks probably played some part. Giordano himself travelled extensively, and Ilardi suggests that monks who encountered spectacles could have demonstrated or reproduced them elsewhere. Alessandro della Spina’s willingness to teach others how to make them offers a particularly plausible mechanism for early diffusion.
Commerce was even more important. In Venice, spectacles could be produced by several types of craftsmen and sold through mercers. Ilardi notes that they were available in shops and from ambulant vendors. The combination of small size, practical value and relatively straightforward construction made them particularly suitable for circulation through trading networks.
Germany and the Archaeological Evidence
Germany provides some of the most important surviving physical evidence. Excavations beneath the choir stalls of the convent at Wienhausen in Lower Saxony uncovered complete spectacle frames, fragments of others and plano-convex lenses associated with riveted spectacles. The choir dates from around 1330, although Ilardi cautiously places the straight-handled spectacles somewhat later in the fourteenth century. Whether they were imported complete or assembled locally from imported materials cannot be determined.
Further fourteenth-century frames were found at Freiburg, while fragments from Alvastra in Sweden may be of comparable antiquity, although their dating is less secure. These archaeological discoveries matter because actual medieval spectacles survive poorly. Frames were small and fragile; lenses broke; useful objects were repaired, recycled or discarded. Written and artistic evidence therefore often survives where the physical objects do not.
England: From Expensive Possession to Mass Import
England provides another revealing trail. An inventory compiled after the death of Walter de Stapeldon, Bishop of Exeter, in 1326 records a pair of spectacles with two lenses valued at two shillings.
This is only twenty years after Giordano’s Florentine sermon and shows that spectacles had already crossed the Alps and Channel into elite English possession.
By the end of the century, the scale had changed dramatically. London customs records show 1,152 pairs imported during part of 1384. In May and June 1390 another 764 pairs were recorded; in April and May 1391 the figure reached 4,104 pairs.
Even allowing for the fragmentary nature of customs records, this was no longer an exotic curiosity restricted to bishops and wealthy scholars. Within roughly a century of their invention, spectacles had become an item of international commerce.
Vendor of eyeglasses of Nicolas de Larmessin II, 1700 circa. Collezione Vascellari STM72, Venezia
Flanders, Peddlers and International Merchants
By the fifteenth century, merchants and peddlers from the Low Countries were prominent participants in the spectacle trade.
Ilardi notes Dutch and Flemish involvement in the English market and the presence of Flemish spectacle peddlers in London. Spectacles could travel alongside the miscellaneous small goods sold as haberdashery, making the itinerant trader an effective agent of technological diffusion.
The spread of spectacles should therefore not be pictured as a single route radiating neatly outwards from Pisa or Venice. Friars, craftsmen, merchants, sailors, foreign apprentices and peddlers overlapped. A pair made in one city could be sold by someone from another and repaired by a local craftsman somewhere else entirely.
What About the East?
The evidence becomes more delicate when following spectacles eastwards. It is sometimes said that missionaries carried spectacles east, but this should not be projected unquestioningly back into the earliest medieval phase.
In Ilardi’s evidence, the better-documented route into the eastern Mediterranean is commercial. By the later fifteenth century, Florentine merchants were exporting large batches of spectacles to the Levant. Ilardi records shipments numbering hundreds of pairs and points to the deep involvement of Venetian, Genoese, Florentine, Jewish, Greek and other merchants in Mediterranean exchange.
Missionaries would indeed become important carriers of European knowledge and objects farther east in later centuries, but the surviving evidence used to reconstruct the first medieval expansion of spectacles is much stronger for trade, travelling craftsmen and religious networks within Europe than for an early missionary route to Asia.
A Small Device with an Enormous Consequence
There is a temptation to write the history of invention around famous names. The history of spectacles resists it.
The man Giordano da Pisa claimed to have met has vanished from the record. Alessandro della Spina was an ingenious reproducer and disseminator, not the original inventor. Salvino degli Armati belonged to a much later and unreliable Florentine tradition. Venice possessed the glassmaking expertise and the earliest surviving commercial regulations, but no surviving document securely identifies a Venetian inventor.
What remains is the object itself. Its components were not revolutionary. Convex lenses existed. Magnification was understood. Reading stones were familiar. The revolutionary step was to take two lenses and turn them into something that could become, quite literally, an extension of the human eye.
That deceptively modest rearrangement had profound consequences. A scholar whose near vision deteriorated with age could continue reading. A scribe could continue working. A merchant could examine his accounts. A craftsman could return to fine detail.
The useful working life of literate men and women no longer had to decline at precisely the same rate as their eyesight. The speed of adoption tells its own story.
An invention that Giordano still considered strikingly new in 1306 was regulated as merchandise in Venice, painted onto the noses of scholars by 1352, found archaeologically in northern Germany and imported into London by the thousand before the fourteenth century ended.
We may never know the name of the person who first connected those two lenses. Perhaps that is appropriate.
The invention of spectacles looks less like the achievement of an isolated genius than the product of the highly connected medieval world that carried it forward: Italian glassworkers, Dominican friars, merchants, artisans and travelling sellers, each passing on an object too useful to remain secret. The inventor disappeared. His invention did not.
Frequently Asked Questions
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Sources
- Bonaini, F. (Ed.). (1845). Chronica antiqua conventus Sanctae Catharinae de Pisis. Archivio Storico Italiano, 6(2), 399–593. The relevant passage concerning Alessandro della Spina appears at pp. 476–477. The source and pagination are confirmed in Panella’s study and Ilardi’s transcription.
- College of Optometrists. (n.d.). The history of spectacles. British Optical Association Museum. https://www.college-optometrists.org/the-british-optical-association-museum/the-history-of-spectacles
- Daxecker, F. (1999). Three reading aids painted by Tomaso da Modena in the chapter house of San Nicolò Monastery in Treviso, Italy. Documenta Ophthalmologica, 99, 219–223. https://pubmed.ncbi.nlm.nih.gov/11108121/
- Del Lungo, I. (1920). Le vicende d’un’impostura erudita (Salvino degli Armati). Archivio Storico Italiano, 78(1), 5–53. https://www.jstor.org/stable/44460245
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- Ilardi, V. (2007). Renaissance vision: From spectacles to telescopes. American Philosophical Society. https://archive.org/details/bub_gb_peIL7hVQUmwC
- Monticolo, G., & Besta, E. (Eds.). (1914). I capitolari delle arti veneziane sottoposte alla giustizia e poi alla giustizia vecchia dalle origini al MCCCXXX (Vol. 3). Forzani e C., Tipografi del Senato.
- Panella, E. (2020). Alessandro della Spina da Pisa, elabora occhiali. Archivio di Santa Maria Novella. https://archivio.smn.it/emiliopanella/nomen3/alexpisa1.htm
- Rosen, E. (1956). The invention of eyeglasses. Journal of the History of Medicine and Allied Sciences, 11(1), 13–46; 11(2), 183–218.
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Luciano is the founder of the MedievalHistory platform and the LinkedIn History Enthusiasts Group, where he is dedicated to curating and sharing high-quality medieval history content. His goal is to engage scholars, teachers, students, and enthusiasts by fostering insightful discussions and promoting scholarly resources on topics from medieval warfare and religion to societal transformations and daily life in the Middle Ages.
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With a Master of Arts in Business Process Management, Luciano combines his expertise in IT strategy and governance with his passion for medieval history. He leverages technology to bridge the academic community and the wider public, making historical scholarship more accessible through engaging online content.
