Femtosecond Laser-Assisted Big-Bubble Deep Anterior Lamellar Keratoplasty

Figures & data

Table 1 Femtosecond Laser Parameters for Tunnel Incision

Parameter	Value	Description
Position	130°	Axial position of the incision
Angle of plane 1	35°	Angle at the entry of the incision
Length of plane 2	0.4 mm	Length of the posterior parallel part of the incision
Outer width	0.5 mm	Width at the entry of the incision
Inner width	0.4 mm	Final width at the endpoint of the incision

Table 2 Femtosecond Laser Parameters for Mushroom Lamellar Incision

Parameter	Value	Description
Anterior diameter	9.0 mm	Diameter of the MLKP at the anterior surface of the cornea
Posterior diameter	6.0 mm	Diameter of the corneal bed resulting from pachymetry, diameter and side cut angle
Depth ratio	70%	Ratio of cutting depth to pachymetry

Figure 1 Surgical microscopy and integrated optical coherence tomography images of tunnel and mushroom FSL incisions. Frontal view of the tunnel incision in the paracentral position at 130° (A, arrowhead); plane 1 is angulated while plane 2 lies parallel to the corneal surface (B, arrow); the cut of the internal layers is clear from the frontal view (C); anterior, middle, and posterior view of the lamellar cut following mushroom configuration (D).

Figure 2 Appearance of type 1 and type 2 BB after eversion of the cornea. Type 1 BB, frontal (A) and lateral view (B); type 2 BB, frontal (C) and lateral view (D) showing a smaller diameter type 1 compared to type 2 bubble.