The interchangeable Rx system is designed for both the Outside the Wire (OTW) goggle, Pivlock Echo, and Aegis eyeshield. A single, integrated Rx carrier can be used in either product. The Smith Optics Elite Rx carrier is engineered to accommodate corrections up to +/- 11 diopters. The kit comes with everything you will need to bring Rx into your OTW goggle or Aegis eyeshield. Rx system when installed will not affect ballistic quality of the eye protection.