A recent international research review offers new insight into how often keratoconus has been reported across different parts of the world and over time. The study brings together findings from many years of research to better understand global patterns related to this condition. 

The research, conducted by investigators in Canada and published in the peer-reviewed journal Cornea, reviewed results from 55 previously published studies spanning more than six decades.  

Rather than following individual patients, the researchers examined studies that reported how often keratoconus was diagnosed in different populations. By comparing data from many regions, age groups, and time periods, the authors were able to look at long-term trends on a global scale. 

What did the study show? 

Overall, the review found that keratoconus has been reported more frequently in recent years, with the highest numbers appearing in studies published after 2020. At the same time, reported numbers varied across different time periods, with some years showing higher or lower estimates than others. 

The authors noted that these differences may reflect variations in how studies were conducted or how populations were sampled, rather than clear changes in the condition itself. 

Who was most often affected? 

Across the studies reviewed: 

• Young adults ages 20 to 29 were the most frequently affected group 

• Males were diagnosed more often than females 

These patterns were seen consistently across many regions. 

 How did findings differ by region? 

The researchers also found wide geographic variation: 

• Higher reported rates were seen in parts of Africa and South Asia 

• Lower reported rates were seen in Europe and East Asia 
• Some regions did not have enough data to fully assess patterns 

Why does this matter? 

The authors emphasized that understanding these global patterns helps highlight the overall burden of keratoconus and underscores the importance of: 

• Awareness of the condition 

• Access to appropriate screening and care 

• Ongoing research to better understand regional and time-based differences 

They concluded that continued study of these trends may help inform future public health strategies and patient care efforts related to keratoconus. 

Frequently Asked Questions About This Study 

Does this study mean keratoconus is becoming more common?
The study found that keratoconus has been reported more frequently in recent years, but it did not determine why this is happening. The authors caution that differences over time may be related to how studies were conducted rather than definite changes in the condition itself. 

Does this research change how keratoconus is treated?
No. This study focused on reviewing how often keratoconus has been reported around the world. It did not evaluate treatments or make recommendations about individual care. 

Why do rates look different in different parts of the world?
The researchers observed wide variation by region but did not identify specific causes. They noted that future research is needed to better understand why these differences exist. 

Who should pay attention to these findings?
The findings are relevant to patients, families, clinicians, researchers, and public health leaders. They help build a broader understanding of how keratoconus affects populations worldwide.