Similarly, TNF-α levels exhibited a non-significant trend toward lower concentrations in more severe disease (8.9026 ± 5.2466 ng/mL in mild, 6.9365 ± 0.8192 ng/mL in moderate, and 7.3175 ± 0.6868 ng/mL in severe KC; p = 0.546). Here, TNF is linked to keratoconus.