Adjustable Distance Reading Glasses- Focus Lens. FEATURES Perfect for when You Don't Have Time to Wait for Your Glasses to Be Made. Continuously Adjustable Near, Intermediate and Distance Tasks. Easily Changes the Glasses to Match Your Needs Whether You Are Reading or Watching TV or More. Corrects over 90% of Spherical Errors (-6D to +3D Spherical). However, These Eyeglasses Will Not Correct Astigmatism. The Lenses in These Eyeglasses Do Not Eliminate the Need for Prescription Lenses. DO NOT Use for Driving And/or Operating Heavy Machinery. TECHNOLOGY Two- Wave Shaped Poly-carbonate Plates Slide Across One Another to the Change the Power of the Lens. Package Included As Shown . We are an international based seller that will ship your order from abroad, please at least a minimum 14 working days for delivery right now due to the ongoing delays in shipments globally.