The history of printing is usually told from the printer’s side, but it has a second façade—from the reader’s eye. Here, glass and text spend a century and a half getting used to one another, and it begins with a diplomatic note on the quality of type.
March 12, 1455: Aeneas Silvius Piccolomini writes from Wiener Neustadt to Cardinal Juan de Carvajal. The subject is neither war nor conciliar intrigue, but a piece of trade news: a Bible is being sold in Frankfurt, and selling briskly. Piccolomini had seen its quires back in the autumn of 1454, at the Diet convened in response to the Turkish threat, and now he reports the crucial part: the book is printed so cleanly and correctly that it can be read “without spectacles.” He calls its letters “most clean and correct, not erring in any respect,” while buyers snap up the quires before the printer has finished the whole book. A diplomat who had served Emperor Frederick III for many years and spoken on his behalf at that very coronation in Rome in 1452 finds time to tell a colleague about the quality of the type—and hits the mark: this is one of the earliest written accounts by a contemporary of Johannes Gutenberg’s work.
I love the very phrase “without spectacles.” Praise for the printer’s art is framed through the reader’s optics: the standard of legibility is the eye—and an eye burdened by age. The letter’s author knew reading professionally—Piccolomini was one of the most indefatigable correspondents of his century, and his chancery-minded curiosity works here like a reporter’s. Three years later, he would take the papal throne as Pius II.
Spectacles are 170 years older than the printing press, and their birthplace is northern Italy at the end of the 13th century: around 1285. The traces emerge quickly. 1289: a Tuscan manuscript connected with the Popozo family records the complaint of a man whom age no longer allows to write or read without “glasses called spectacles.” 1301: the statutes of the Venetian crystal-workers’ guild permit the making and sale of “glass for the eyes, for reading”—the craft has already been legalized. 1303: the physician Bernard de Gordon, in Lilium medicinae, prescribes an eye-drop so potent that, he promises, an old man will read the tiniest letters even without a “beryl eye.” And on February 23, 1306, the Florentine congregation at Santa Maria Novella hears the Dominican Giordano da Pisa speak like a technology columnist: the art of making spectacles was discovered recently, less than “twenty years” ago, and was, in the preacher’s words, “one of the best and most necessary arts in the world.”
I admit, what delights me most about this sermon is the genre itself: a monk in the pulpit explaining a fashionable optical novelty to parishioners—exactly as we now explain gadgets. Behind the words “less than twenty years” lies the object’s physics too: early spectacles were convex lenses for reading. With age, the crystalline lens loses its elasticity, the eye stops focusing at close range, and a plus lens restores an old reader’s working distance. Giordano’s sermons survive in listeners’ notes—anonymous 14th-century stenographers left us the birth date of the spectacle trade accurate to the day.
In 1352, Tommaso da Modena paints the Dominican monastery of San Nicolò in Treviso with portraits of famous brothers of the order. In one fresco, Cardinal Hugh of Provence reads a book with spectacles on his nose: the first depiction of spectacles in European art. From there the motif becomes familiar: Jan van Eyck, in The Madonna of Canon van der Paele (around 1434–1436), paints the canon holding spectacles in his hand; the Nuremberg artist Michael Wolgemut (1434–1519), Dürer’s master, puts spectacles into his engravings; and in 1514, Quentin Massys unfolds the same theme in The Moneylender and His Wife: there are no spectacles on the canvas at all, only a convex mirror on the table at the center, and the wife bent over a book of hours. With Massys, optics change function: the lens gives way to the mirror, which looks out at the world from the shop.
With Tommaso da Modena, lenses are the mark of a scholar; with Massys, there are no lenses left at all. The object has come down from the fresco into the shop.
What exactly did the press change? It standardized legibility. A manuscript book is the hand of a particular copyist, with all its flourishes and fatigue; a printed book means identical letters, identical lines, an identical print run. Gutenberg’s 42-line Bible appeared in an edition of around 180 copies, while fairs—Frankfurt above all—became hubs where printed quires met money. Beyond that, one must be careful with conclusions: printing did not create mass myopia, nor did it single-handedly turn spectacles into a mass commodity. It is more accurate to put it this way: rising literacy, strengthening urban crafts, and the book trade expanded the circle of people for whom spectacles were both needed and affordable—the press flowed into that current as a powerful tributary. Archaeology bears this out: of the hundreds of surviving spectacle lenses from the 14th and 15th centuries, around forty are concave; the rest were for elderly readers. Contemporaries did not notice this new demand. The authors of a survey of printed illustrations of spectacles before 1501 write bluntly: “It is commonly assumed that the invention of printing greatly increased the demand for spectacles, but interestingly there are few contemporary sources to support this hypothesis.”
Meanwhile, Italian glassworking centers were working flat out for optics. In 1291, Venice moved its glass furnaces to Murano—for fear of fires, and in the process created one of Europe’s great industrial landscapes. Italian workshops produced ready-made spectacles as a serial commodity; lenses were fitted long before ophthalmology existed—by the tray method: glasses of varying strengths were laid out before the customer, who tried them on until the text “settled” into the eye. Roughly speaking, the 15th century’s refractometer was a patient shopkeeper.
Trade documents preserve the delicate details too. On August 25, 1451, Florentine sources record the first known order for concave spectacles—lenses for a myopic eye, meaning a young customer rather than someone with age-related farsightedness. I like that chronological detail in its own right: it comes four years before the letter about the Bible. And on October 21, 1462, the Duke of Milan, Francesco Sforza, orders a batch of spectacles—wholesale, for the court. When spectacles are bought by the boxful, they cease to be a curiosity: before us is an everyday object with courtly demand and a retail tray.
While Frankfurt traded in quires, an idea of another order was ripening among the Church’s upper ranks. Nicholas of Cusa—cardinal, philosopher, the man of “learned ignorance”—writes between 1450 and 1458 the treatise De beryllo, “On Beryl.” Beryl is a transparent stone from which spectacle lenses were cut; Cusa takes a concave and a convex one and looks through them three times: at things, at writing, at himself. The concave diminishes, the convex magnifies—and on that simple contrast the cardinal builds a model of knowledge: the mind always looks through its own lenses, and whoever does not know their curvature mistakes his own distortion for truth.
This is a philosophical text, not a guide to correcting vision: it contains neither polishing recipes nor optical calculations. Cusa needs lenses as an intellectual metaphor—technology turned into a way of thinking about the limits of thought. It is telling, too, that the two protagonists of this story—Piccolomini and Cusa—belong to the same mid-15th-century Church circle: one took the papal throne in 1458, while the other, in those same years, was examining metaphysics through a spectacle stone. And the Gutenberg copy from Cusa’s collection never made it to Kues: in the Latin translation of The Support there is a note from 1455 in which the cardinal asks for “the quires of that Bible which, they say, is being sold in Frankfurt” to be sent to him.
1608, Middelburg in Zeeland: spectacle-maker Hans Lipperhey is among those who file the first patent applications for the spyglass. Yet the construction remains entirely spectacle-based: a convex objective plus a concave eyepiece—both lenses from the stock of the shop, where convex ones had long served aging eyes and concave ones, as in that Florentine order from a century earlier, the myopic. The craft that had served readers for a century and a half turned its lens toward the horizon itself: in 1609, Galileo assembles his own tube from reports of the Dutch curiosity, demonstrates it to the Venetian Senate from the bell tower of San Marco in August, and in March 1610 publishes The Starry Messenger—with the mountains of the Moon and the moons of Jupiter. In 1611, Johannes Kepler publishes Dioptrice—the first theory of the telescope, in which optics gains a mathematical skeleton.
The outcomes of this line are dry, but revealing. Lipperhey received no monopoly—the States General did not reward him with a patent, and the telescope began multiplying without a single rights-holder. Galileo’s instrument brought him fame and a place at the Medici court: he named the moons of Jupiter he had discovered the “Medicean stars.” Everyday optics, meanwhile, kept squeezing out the small improvements: in 1725–1730, the London optician Edward Scarlett would add temple arms to spectacles—before that, for more than 300 years, glasses had clung to the bridge of the nose through the stubbornness of anatomy—and in the 1780s, Benjamin Franklin would assemble the first bifocal lenses for those who read and look into the distance with the same eyes.
Printing and spectacles did not stand in a “cause-and-effect” relationship: they belonged to a single material revolution of the early modern age, in which text, glass, vision, and knowledge began to be produced and sold on scales never seen before. Piccolomini praised the book through the eye; Cusa examined the mind through lenses; Lipperhey turned the spectacle shop toward the horizon. That revolution, though, had a legal underside too: in November of that same year, Gutenberg lost to his financial partner Johann Fust—the case was heard at the court of the Archbishop of Mainz, in a Dominican monastery—repaid the loan with interest, and parted with his printing equipment—the Bible Piccolomini admired was brought to buyers by Fust and his son-in-law Peter Schöffer. Pius II himself died in 1464 in Ancona, still assembling a crusade against the Turks.