How large are PFAS particles? Because the Bowman's layer found just under the epithelium should stop most particles from reaching the stroma. The Bowman's layer

How large are PFAS particles? Because the Bowman's layer found just under the epithelium should stop most particles from reaching the stroma. The Bowman's layer is particularly frustrating for medicinal delivery - it stops most particles from reaching stroma/endothelium. This makes corneal burn recovery quite difficult. So if PFAS has some mechanism to pass through the Bowman's layer, it could be useful for medicine delivery and healing corneal wounds.