Characteristics of included studies
| First author (year) | Design of study | Country | Sample size | Mean age (years) | Standard BMI | Assessment tool |
| Coster27 (2023) | Cohort study | Israel | 7720 | Normal: 46.47±10.67 Overweight: 46.57±10.08 Obese: 46.57±10.08 Morbidly obese: 46.57±10.08 | European WHO criteria | Non-contact tonometry |
| Jung37 (2023) | Cross-sectional study | South Korea | 14 503 | Normal: 46.47±10.67 Obese: 46.57±10.08 | Revised Asia-Pacific WHO criteria | Non-contact tonometry |
| Hazar38 (2021) | Cross-sectional study | Turkey | 37 | Normal: 11.87±2.78 Obese: 11.75±3.31 | CDC BMI-for-age percentile growth charts | Non-contact tonometry |
| Baran16 (2019) | Cross-sectional study | Turkey | 93 | Obese: 14.7±1.95 Normal: 15.46±1.82 | SD score | Goldmann applanation tonometry |
| Teberik17 (2019) | Cross-sectional study | Turkey | 196 | Obese: 35.9±11.5 Normal: 36.6±11.8 | European WHO criteria | Goldmann applanation tonometry |
| Panon18 (2019) | Cross-sectional study | Thailand | 120 | Obese: 47.00±15.00 Normal: 45.60±11.51 | Asian WHO criteria | Non-contact tonometry |
| Oner19 (2018) | Case–control study | Turkey | 77 | Obese: 41.90±11.88 | European WHO criteria | Dynamic contour tonometry |
| Cekic20 (2017) | Cohort study | Turkey | 59 | Obese: 37.80±10.00 Normal: 33.46±7.80 | European WHO criteria | Goldmann applanation tonometry |
| Ngo21 (2013) | Cohort study | USA | 115 | Obese: 65.1±9.32 Overweight: 62.2±11.14 Normal: 68.1±11.71 | European WHO criteria | Goldmann applanation tonometry |
BMI, body mass index; CDC, Centers for Disease Control.