Monthly contact lenses designed to combat dry eye symptoms and increase comfort levels. Extreme H2O’s unique material helps them maintain constant lens humidity and high oxygenation throughout the day. Base Curve (BC) is referred to as ‘MED’ on packaging. Conversion as follows: Diameter 13.6 = BC 8.3 Diameter 14.2 = BC 8.6 The production of lenses with certain parameters has been terminated. It is therefore not possible to order the parameters which are not shown.