Figure 1.

(1) Creation of a 6-mm-diameter circular intrastromal pocket, by means of the femtosecond laser, leaving a clear optical zone of 3 mm. (2) Creation of two 0.5-mm-width entry channels 180° apart. Following the pocket creation, a tapered Intacs spatula mall Jameson muscle hook was used to enter and bluntly dissect the pocket. (3) Infusion of 0.3 ml of 0.1% riboflavin solution into the pocket using an Intacs stromal channel irrigation cannula. Infusion continued until the entire pocket was colored bright yellow due to the presence of the riboflavin solution. (4) A UVA irradiation source of ∼370 nm wavelength (365–375 nm) was used for corneal surface irradiation.