<p>Representative preoperative (left) and postoperative (right) slit-lamp photographs illustrating surgical interventions selected according to the severity-based surgical algorithm for refractory Mooren’s ulcer.</p>

(B, b) Partial LK: C-shaped LK for deep corneal ulcer presenting as descemetoceles, demonstrating graft transparency and restored corneal structural integrity. (C, c) Double-layer LK for a 4 mm corneal perforation with iris prolapse: A large D-shaped outer lamellar graft overlying a small, thin inner patch graft secured at the nasal perforation site, showing postoperative graft transparency and structural integrity.

(D, d) Total LK for extensive peripheral corneal ulceration extending over 9 clock hours with central involvement, showing postoperative interface haze and vascularization while maintaining structural integrity. (E, e) Large C-shaped PK for extensive peripheral corneal ulceration spanning 9 clock hours with a 5 mm paracentral perforation, demonstrating mild postoperative graft edema while preserving corneal structural integrity and the recipient's nasal cornea.