The isn't anything special with any "reflection free " glass. It is just an anti-reflective (AR) coating added to the glass.
Very similiar to what is used on prescription eyeglass lenses, such as Crizal Avance, Crizal Sapphire, Kodak Clean and CleAR, or Zeiss AR.
Each AR coating has its own "formula" with various attributes - light transmission, scratch resistance, etc.
In eyeglasses, other attributes are important as well - cleanability, adherence to lens material, etc.