Cleavage plane after liquid-bubble preparation of Descemet's membrane

To investigate the ultrastructure of the cleavage plane of human cornea after liquid-bubble-prepared tissue for Descemet's membrane endothelial keratoplasty (DMEK).

Experimental study with scanning electron microscopy (SEM) and block-face SEM of 18 corneal specimens. Fresh human research donor corneoscleral discs (n = 12) were prepared with liquid-bubble technique or examined as untreated controls (n = 3). In addition, Descemet's membrane samples, n = 3, were obtained in DMEK surgery.

The cleavage plane after liquid-bubble Descemet's membrane (DM) preparation was consistently located between interfacial matrix and posterior stromal collagen lamellae, providing a largely smooth surface exposing the amorphous interfacial zone without any significant amounts of adherent stromal remnants. No demarcation of a distinct pre-DM layer could be detected.

The DMEK graft preparation performed by liquid-bubble technique showed a smooth cleavage plane and could not reveal any demarcation of a distinct pre-DM layer.