1. Penetrating Keratoplasty :
The entire diseased cornea of the host is replaced by a new donor graft & secured with the help of sutures.
It can be optical (In cases of cornea scars) or Therapeutic (for non –healing perforated corneal ulcers)

2. Descemets Stripping Endothelial Keratoplasty (DSEK) :
The non-functioning endothelial pump of the host cornea is replaced by the healthy donor tissue. The whole cornea is not changed & only the endothelial part is replaced. It can be done in cases of endothelial dystrophies or bullous keratopathy.

3. Deep Anterior Lamellar Keratoplasty (DALK) :
The whole cornea, except the descemets membrane & the endothelium are replaced. Chances of rejection in this procedure is minimal as the endothelium is not replaced. It can be done in cases of keratoconus or anterior corneal dystrophies & degenerations.