Lenses Explaination : Prescription customization does not include high prescription, photochromic, multifocal, prescription sunglasses CYLINDER: "+/-"2.00~"+/-"4.00 or CYL:"+/-"2.00~"+/-"4.00 Costs Extra 10 USD.(ADD 10$). CYLINDER: "+/-"4.00+ or CYL:"+/-"4.00+ Costs Extra 20 USD.(ADD 20$).