Dissection plane in deep anterior lamellar keratoplasty using the big-bubble technique.
OBJECTIVE
To find the level of dissection in keratoconic corneas undergoing deep anterior lamellar keratoplasty (DALK) using the big-bubble technique.


METHODS
In 3 keratoconic eyes that underwent DALK, the operation was converted into penetrating keratoplasty after complete big-bubble formation because of extensive tear in Descemet's membrane (DM) during stromal excision. The corneal stroma and DM taken from these eyes were submitted for light and transmission electron microscopy.


RESULTS
Both light and transmission electron microscope revealed a thin layer of corneal stroma adhered to DM in all cases. In 2 eyes, the residual stromal thickness was almost constant (6.4 μm and 12.3 μm), whereas it varied from 9.5 μm to 25.8 μm in the other one.


CONCLUSIONS
Dissection plane in DALK using the big-bubble technique can be within corneal stroma rather than exactly between stroma and DM. Various corneal pathologies as well as different techniques of dissection may have influence on this level.
Jafarinasab
Mohammad Reza
MR
Ophthalmic Research Center and Department of Ophthalmology, Labbafinejad Medical Center, Shahid Beheshti University, Boostan 9 St., Pasdaran Ave., Tehran, Iran.
Rahmati-Kamel
Mohsen
M
Kanavi
Mozhgan Rezaei
MR
Feizi
Sepehr
S
D000328:Adult; D003319:Corneal Stroma / Q000473:pathology* / Q000601:surgery; D016039:Corneal Transplantation / Q000379:methods*; D003886:Descemet Membrane / Q000473:pathology* / Q000601:surgery; D004210:Dissection / Q000379:methods; D006801:Humans; D007640:Keratoconus / Q000601:surgery*; D015948:Keratoplasty, Penetrating; D055815:Young Adult