Figure 7.

Trends of the leading indications for keratoplasty in Iran over the last 24 years. The trend of change for the rates of bullous keratopathy (P $<$ 0.001), graft failure (P $<$ 0.001), and keratoconus (P = 0.046) shows a significant increase. A significant decreasing trend is observed for the rates of corneal scar and opacities (P $<$ 0.001) and corneal dystrophies (P = 0.002). No significant change of trend is noted for active keratitis (P = 0.968). The regression R ${}^2$ measures the goodness of fit of the regression line. AK, active keratitis; BK, bullous keratopathy; CD, corneal dystrophies; CSO, corneal scar and opacities; GF, graft failure; KCN, keratoconus.