Imagine waiting weeks to get contact lenses that actually fit your eyes — or getting them in just 20 minutes instead. That's the future researchers at the University of Waterloo are building, and it could change life for millions of people who struggle with ill-fitting lenses today.
Most contact lenses sold today come in only a handful of standard sizes, like shoes that only come in small, medium, and large. But people's eyes are as unique as their fingerprints. For folks with unusually shaped eyes — a condition called an irregular cornea — finding the right fit often means months of repeated appointments, special training on how to insert rigid lenses, and still dealing with discomfort. Some people give up entirely.
A team of chemists at Waterloo's Department of Chemistry has just published research that could end that frustrating process. Led by Dr. Shirley Tang, a professor in the department, the researchers developed a new 3D printing system that creates custom lenses specifically shaped for each patient's eyes in just 20 minutes — about the time you'd spend waiting for a coffee order.
The breakthrough comes from solving two big problems. First, the team invented a special silicone material that's safe for eyes and lets plenty of oxygen through (important for eye health), but can also work with 3D printers. Traditional silicone doesn't work well with 3D printing technology. Second, the researchers created software that designs a lens with an inner surface that perfectly matches the patient's cornea and an outer surface that corrects their vision.
"Our technology produces lenses with patient-specific surfaces for a precise fit while delivering the optical clarity and mechanical performance expected of commercial contact lenses," Dr. Tang said.
Because 3D printers build objects layer by layer, tiny steps can form on curved surfaces, which would make lenses blurry or uncomfortable. The Waterloo team solved this too — they developed an ultrathin coating process that smooths the surface without changing the custom shape underneath.
The innovation recently won a gold medal at the Shanghai International Exhibition of Inventions in June 2026. The team has filed a provisional patent and is working with the Center for Vision and Eye Research to bring the technology to market. Human testing is expected to begin soon.
The real impact? Instead of weeks of appointments and hoping for the best, patients could walk into an optometrist's office, get their eyes scanned, and walk out 20 minutes later with lenses made just for them.