There are two types of ZEISS Optical Inserts: Prescription and Readers. And each type is sold as a pair designed to work with Apple Vision Pro. Answer a few questions and we’ll tell you which type you need. If you already bought Apple Vision Pro and now want to purchase optical inserts, then you may need to purchase a new Light Seal. ZEISS Optical Inserts – Prescription Custom made according to your prescription¹ Unique to each eye Magnetic attachment mechanism Optional engraving ZEISS Optical Inserts – Readers Three available readers strengths ZEISS Optical Inserts (Prescription or Readers)