Glasses were invented in northern Italy in the late 1280s, most likely by a craftsman in or near Florence whose name has been lost to history. The earliest concrete evidence comes from a 1306 sermon by a Dominican friar named Giordano da Pisa, who told his congregation: “It is not yet twenty years since there was found the art of making eyeglasses, which make for good vision. … I saw the one who first discovered and practiced it, and I talked to him.” That puts the invention around 1286, and Giordano’s words suggest it was a single person’s breakthrough rather than a gradual, collective effort.
Magnification Before Glasses
Long before anyone thought to wear lenses on the face, people used reading stones: polished, dome-shaped pieces of rock crystal, beryl, or glass that you placed directly on top of a page. The curved surface magnified the letters underneath, helping older readers whose close-up vision had faded. Monks and scholars across Europe and the Islamic world relied on these stones for centuries.
Even earlier, there are hints that ancient and medieval craftspeople understood optics better than we tend to assume. A set of rock crystal lenses found on the Swedish island of Gotland, known as the Visby lenses, date to no later than the early Middle Ages. When researchers analyzed their surface curvatures, they found imaging quality comparable to modern aspheric lenses used in projectors today. Some of these crystals were mounted in silver and worn as pendants, while others show no signs of use as jewelry, leaving their exact purpose a mystery. They were not eyeglasses, but they show that high-quality lens grinding existed long before spectacles appeared.
The Breakthrough in 13th-Century Italy
The leap from a reading stone sitting on a page to a pair of lenses you could hold in front of your eyes required two things: the right glass and the right shape. Both came together in Italy. The glassworks on the island of Murano, near Venice, were the only factories in Europe capable of producing the soft, clear glass needed to grind into optical lenses. Italian monks were the first to craft semi-shaped ground lenses from this material, and by the 1280s someone had figured out how to mount two of these convex lenses into a frame that balanced on the nose.
Those first glasses corrected farsightedness, the age-related blurring of close-up vision that strikes most people after 40. Convex lenses, which are thicker in the middle, bend light inward and bring nearby objects into focus. This made them enormously useful for monks, scribes, and anyone whose livelihood depended on reading. For the first time, a person whose eyes had started to fail could simply put on a device and keep working.
Early Frames Were Barely Frames
The original design was nothing like the glasses you wear today. The first spectacles were “rivet glasses”: two magnifying lenses set into bone, metal, or leather surrounds, joined by a rivet at the bridge so they could be pinched onto the nose. They had no arms extending to the ears. You either held them up to your face or balanced them carefully while you read. Some styles used a handle, like a lorgnette. Others clamped onto the nose with spring tension, a design called pince-nez that persisted for centuries.
It took roughly 400 years for someone to add sidepieces that hook over the ears, the feature that makes modern glasses stay on your face. London optician Edward Scarlett is generally credited with popularizing this “temple arm” design in the early 1700s. That single change turned spectacles from a reading tool you picked up and put down into something you could wear all day.
Correcting Nearsightedness Came Later
The first glasses only helped people who couldn’t see up close. Correcting nearsightedness, the inability to see distant objects clearly, required concave lenses: glass that is thinner in the middle and spreads light outward before it enters the eye. These appeared by the 15th century, roughly 150 to 200 years after the original convex spectacles. The delay makes sense. Farsightedness was a universal problem of aging, obvious and widespread, while nearsightedness was less common and harder to conceptualize as something a lens could fix.
For over three centuries, people used glasses without truly understanding why they worked. That changed in 1604, when the astronomer Johannes Kepler published a treatise on optics. Kepler was the first to recognize the importance of the retina at the back of the eye and to explain how images are inverted inside it. His work finally provided a scientific explanation for how convex and concave lenses correct different vision problems, turning eyeglass design from trial-and-error craft into applied science.
From Luxury to Everyday Object
For the first few centuries of their existence, glasses were expensive and rare. The Murano glassmakers who produced optical-quality glass guarded their techniques, and finished spectacles were hand-ground by skilled artisans. Owning a pair signaled wealth or scholarly status, which is why so many Renaissance portraits show subjects holding or wearing them.
The printing press, introduced in Europe in the mid-1400s, created an explosion in demand. Suddenly millions of people had a reason to read, and many of them needed help seeing the page. Spectacle-making grew into a recognized trade across Europe, with guilds setting standards for lens quality. By the 1700s, street vendors in London sold cheap glasses from trays, and by the industrial era, machine grinding made lenses affordable for nearly everyone. What began as a single Italian craftsman’s innovation became one of the most widely used medical devices in history, worn today by roughly 4 billion people worldwide.