**5.4 Eyes after refractive surgery**

Bowman's layer significantly decreases in eyes after photorefractive keratectomy, and was on average 14.0 μm compared with normal eyes at 18.7 μm. There is significant variability after photorefractive keratectomy with some regions thicker than in normal eyes but most much thinner. The procedure also causes uneven epithelial thickness [24].
