Research
Research and statistics
What published studies say, gathered in one place and linked to the original sources: outcomes, complications, and the numbers behind the conditions scleral lenses treat.
Scleral lens outcomes: what the research shows Studies consistently find that scleral lenses improve vision for people with irregular corneas, often by a large margin, and improve how people rate their daily visual functioning. But a meaningful share stop wearing them: between about a fifth and a third in the studies below, which followed people for six months to about three years, most often because inserting and removing the lenses is hard. Most of the evidence comes from single clinics and retrospective chart reviews, so the figures are a guide, not a promise. Updated October 2, 2026 Scleral lens complications: what the research shows Serious complications from scleral lenses appear to be uncommon in published studies, but they do happen. Infections have been reported, often in eyes that were already fragile or where lens care slipped. The lens slightly reduces oxygen to the cornea, which matters most for eyes with a weakened inner corneal layer, such as some after a transplant. Studies on eye pressure are mixed and mostly short-term. Day-to-day problems such as broken lenses, deposits, and fogging are far more common than medical ones. Updated October 2, 2026 Keratoconus statistics Keratoconus is far more common than older studies suggested. Estimates range from 54.5 per 100,000 people in a 1980s Minnesota study to 1 in 375 in a Dutch insurance database and 1 in 84 young adults in an Australian imaging study, depending on how cases were found. It's usually diagnosed in young adults. Most people don't need a transplant: in the long-running CLEK study, 12% had one in at least one eye over eight years, and transplants for keratoconus have fallen since cross-linking and modern lenses arrived. Updated October 2, 2026 Dry eye statistics Dry eye disease is common, but how common depends on how it's defined. An international expert review found prevalence ranging from 5% to 50% across studies. In the US, a national survey estimated that 6.8% of adults, about 16.4 million people, have been diagnosed with it. It becomes more common with age and is more common in women. Only a small share of people with dry eye need scleral lenses, which are generally used after other treatments have been tried. Updated October 2, 2026 Scleral lenses and corneal transplants: the numbers and the research US surgeons performed 49,427 corneal transplants with US eye bank tissue in 2024, most for failure of the cornea's inner layer. After a transplant, scleral lenses give most people useful vision, often 20/40 or better, but a meaningful share stop wearing them, most often because of handling. Grafted corneas swell more under a scleral lens than healthy ones, and rejection and infection are reported in wearers, though no study has compared wearers with non-wearers. Close follow-up with both your fitter and your cornea surgeon is the consistent advice. Updated October 2, 2026 Scleral lens wearer statistics No registry counts how many people wear scleral lenses, so the best data come from surveys of fitters and from large practices. They agree on the main point: most scleral lenses are prescribed for irregular corneas such as keratoconus, a smaller share for ocular surface disease, and very few for ordinary prescriptions. Scleral lenses are a growing part of rigid lens fitting worldwide, and more practitioners are fitting them than a decade ago. Updated October 2, 2026 Scleral lenses for keratoconus: what the research shows Studies of people with keratoconus consistently find a large gain in vision with scleral lenses compared with glasses, and better scores on vision-related quality-of-life questionnaires. In the studies below, roughly one in five people stopped wearing them within months, most often because of handling. Serious eye problems were uncommon, while everyday lens problems such as breakage and fogging were common. Almost all of this evidence comes from single clinics, and only one small randomized trial compared scleral lenses with corneal rigid lenses. Updated October 2, 2026 Scleral lenses for severe dry eye: what the research shows In people with severe dry eye or ocular surface disease that other treatments haven't controlled, studies find that scleral lenses reduce symptoms, improve vision, and improve quality-of-life scores. But the evidence comes almost entirely from single-clinic case series without comparison groups, often mixing several diseases. People with surface disease seem less likely to keep wearing the lenses long term than people with irregular corneas, and fogging of the fluid layer is a common complaint. For dry eye without other corneal problems, a 2024 review called the evidence sparse. Updated October 2, 2026 Scleral lenses for ocular GVHD: what the research shows In every study we found of people with ocular GVHD whose dry eye didn't respond to standard treatment, symptom scores dropped substantially and vision improved with scleral lenses. Between 8% and 22.6% stopped wearing them in the studies that reported it, over follow-up of up to about two years. No study reported serious problems clearly caused by the lenses. All of the evidence comes from case series and surveys without comparison groups, so it shows what happened to people who were fitted, not how lenses compare with other treatments. Updated October 2, 2026 Scleral lenses for Stevens-Johnson syndrome: what the research shows In people living with eye damage from Stevens-Johnson syndrome (SJS) or toxic epidermal necrolysis (TEN), studies consistently report better vision, fewer symptoms, and large gains on quality-of-life questionnaires with scleral lenses. Not every eye can be fitted, because scarring can change the eye's shape too much, and in a long-term study of children, 30.6% failed treatment. Serious lens-related problems were rarely reported. The evidence is from retrospective case series at specialist centers, with no comparison groups. Updated October 2, 2026 Scleral lenses and quality of life: what the research shows Across keratoconus, transplants, and severe surface disease, studies using validated questionnaires consistently find that people report better daily visual functioning and fewer symptoms after being fitted with scleral lenses. Gains on the NEI VFQ-25 of about 20 to 40 points out of 100 are common, and symptom scores on the OSDI often fall by well over the amount researchers consider meaningful. But nearly all of these studies had no comparison group and measured only people who kept wearing their lenses. In the one randomized trial, people who already did well in corneal rigid lenses scored no better with scleral lenses. Updated October 2, 2026