Blepharitis is one of the most common eye conditions worldwide. Depending on the population studied, it shows up in roughly 37% to 47% of patients visiting eye care clinics, and the related condition of meibomian gland dysfunction affects about 36% of the general population. If you’ve been diagnosed or suspect you have it, you’re far from alone.
Prevalence in Eye Care Settings
The clearest picture of how common blepharitis is comes from clinical surveys. In the United States, nearly one-third of patients seen by ophthalmologists and about half of those seen by optometrists show signs of blepharitis. Globally, studies consistently find that 50% to 75% of patients visiting eye care providers for any reason have some degree of blepharitis or meibomian gland dysfunction, often without realizing it. Many people live with low-grade eyelid inflammation for years before it’s formally identified.
General population estimates are harder to pin down because many cases go undiagnosed. The best available global data put the pooled prevalence of meibomian gland dysfunction (the most common form of blepharitis) at about 35.8%. That means roughly one in three adults may have some degree of the condition at any given time.
How Rates Vary by Ethnicity and Region
Blepharitis does not affect all populations equally. The variation across ethnic and geographic groups is striking: prevalence is around 21% in African populations, 30% in Caucasian populations, 68% in Hispanic populations, and 71% in Arab populations. These differences likely reflect a combination of genetics, climate, skin type, and environmental exposures rather than any single factor.
Regional studies reinforce this pattern. In a Saudi Arabian hospital study, 89% of referred patients had blepharitis. In an Italian study of patients with general eye complaints, 12% had anterior blepharitis specifically. A study of adult patients in Bogotá, Colombia found blepharitis in 68% of those examined. Where you live and your background genuinely influence your risk.
Age Is the Strongest Risk Factor
The older you are, the more likely you are to have blepharitis. This relationship is consistent across studies and holds true regardless of sex. One large study tracking infection with Demodex mites, which are responsible for more than two-thirds of blepharitis cases in the U.S., found the following rates by age group:
- Ages 1 to 25: 8%
- Ages 26 to 40: 36%
- Ages 41 to 55: 50%
- Ages 56 to 70: 67%
- Over 70: 77%
Sex, on the other hand, does not appear to be a meaningful factor. Multiple analyses have found no statistically significant difference in blepharitis rates between men and women.
Blepharitis in Children
While blepharitis is overwhelmingly an adult condition, it does occur in children. Pediatric blepharitis often shows up as recurring styes, eyelid inflammation, and eventually corneal involvement. This combined pattern accounts for 15% to 25% of pediatric corneal referrals and has been observed in children as young as 5 months old. It tends to be more aggressive in children than the typical adult presentation, sometimes causing corneal scarring if left untreated.
Posterior vs. Anterior Blepharitis
Blepharitis comes in two main forms. Anterior blepharitis affects the outer edge of the eyelid where the lashes attach, often caused by bacteria or skin conditions. Posterior blepharitis involves the oil-producing glands on the inner eyelid margin and is essentially what clinicians call meibomian gland dysfunction.
Posterior blepharitis is significantly more common overall, accounting for about 56% of diagnosed cases in one large clinical study compared to just 13% for the purely anterior type (with the remainder being mixed). Interestingly, the balance shifts with age: posterior blepharitis is more common in younger people, while anterior blepharitis increases in frequency as people get older.
The Demodex Connection
Tiny mites called Demodex live naturally on human skin and eyelashes. In small numbers they’re harmless, but overpopulation of these mites is now recognized as the cause of more than two-thirds of all blepharitis cases in the United States. These mites become more prevalent with age, which helps explain why blepharitis rates climb so steeply in older adults. For years, Demodex-driven blepharitis was underdiagnosed because clinicians treated it as generic eyelid inflammation without identifying the underlying cause.
Links to Rosacea and Dry Eye
Blepharitis rarely exists in isolation. It overlaps heavily with two other common conditions. Rosacea, the skin condition that causes facial redness and flushing, has an ocular component in 10% to 50% of cases. Ocular rosacea directly inflames the eyelid margins, and in about 20% of rosacea patients, the eye symptoms appear before any skin changes do. If you have rosacea and notice irritated, gritty eyes, blepharitis is a likely contributor.
Dry eye disease is the other major overlap. Posterior blepharitis disrupts the oil layer of the tear film, which causes tears to evaporate too quickly. This makes blepharitis the most common cause of evaporative dry eye. The two conditions feed each other: inflamed eyelids worsen dryness, and an unstable tear film irritates the eyelid margins further.
Daily Life With Blepharitis
Because blepharitis is chronic, its effects accumulate over time. More than half of patients in one survey had been dealing with symptoms for four years or longer. The condition takes a real toll on daily functioning: 47% of patients reported being conscious of their eyes all day long, and 23% said they constantly worried about their eyes.
Practical disruptions are common. Nearly half of patients reported difficulty driving at night. Thirty percent said their daily hygiene routine took noticeably longer because of lid care. Among women, 34% had trouble wearing eye makeup, and some had to reduce or stop using contact lenses due to discomfort. The appearance of red, flaky, or crusty eyelids bothered nearly a quarter of patients enough that they felt self-conscious around others.
The psychological burden is substantial. Overall, 80% of patients with Demodex blepharitis reported negative effects on psychosocial well-being. People with blepharitis have a 67% higher risk of anxiety and a 52% higher risk of depression compared to those without the condition. The combination of chronic discomfort, cosmetic concerns, and repeated visits to eye care providers with treatments that often feel inadequate contributes to this pattern.