In its marketing capacity, the term SBK is generally associated with a femtosecond laser (usually the IntraLase [AMO/IntraLase Corp, Irvine, Calif]) with its claim to make accurately thin flaps with parallel surfaces. In fact, some have defined “SBK” as only being performed with a femtosecond laser. However, because 100-μm fl aps with good precision and parallel surfaces can be made by a mechanical microkeratome (such as the SCHWIND Carriazo-Pendular [SCHWIND eyetech-solutions, Kleinostheim, Germany]) and meniscusshaped 100-μm flaps can be made with others (such as the Moria M2 [Moria, Antony, France]), predictable thin “sub-Bowman’s” flaps are not the province of femtosecond technology, as demonstrated by Alio and Piñero in this issue of the Journal.