Figure 4.

Two options for locating the entry point are shown. Option 1 (left): The a lines delimit the upper and lower boundaries of the zygomatic bone. Line b marks the perpendicular projection of the outer canthus of the eye. The entry point is located as the midpoint of line b between the two a lines. Option 2 (right): Line A represents the projection of the nasojugal fold. Line B marks the perpendicular projection of the outer canthus of the eye. The entry point is the intersection between these lines