National NA0331 Progressive Prescription Eyeglasses

National NA0331 Eyeglass Frames Description:

• Frame Type: Plastic
• Flex Temple: No

Package Contents:

• Genuine National NA 0331 Prescription Rx Eyeglasses with No Line Progressive Lenses

National Eyeglasses Prescription Information:

We, at OpticsPlanet, try to make it easy to order Progressive Eyeglasses on line by providing as much information as we can. See our detailed Rx information page that explains How to Read Your Eyeglasses Prescription.

Available National NA0331 Prescription Lens Styles:

• National Eyeglasses NA0331 with Single Vision Lenses
• National Prescription Eye Glasses NA0331 with Rx Lined Bi Focal Lenses
• National Prescription Eye Glasses NA0331 with Rx No Line Progressive Lenses (presented above)

These National Eyeglasses are also available as National Frames without prescription lenses:

National NA0331 Eyeglasses without lenses

National Progressive Eyeglasses Rx Lenses are available in the following lens materials:

• CR-39 Plastic (also known as hard resin) is overall cost-effective & most commonly used lens material. CR-39 is thinner and lighter than glass. Recommended sphere range is 0.00 - +/-8.00 and cylinder range is 0.00 - +/-2.00
• Polycarbonate is the most impact resistant lens available. Polycarbonate lenses are highly recommended for kids, sportsmen and military. This lens material is thinner & lighter than CR-39 or glass. It blocks UV rays. Anti-scratch coating is included. Recommended sphere range is +/- 2.00-8.00
• Aspheric Polycarbonate lenses feature the same properties as polycarbonate lenses, but they are recommended for plus (+) sphere prescriptions only
• High Index 1.60 (also known as HX 1.60) lenses are thinner & lighter than CR-39 or glass. Recommended sphere range is 0.00 - +/-15.00
• High Index 1.67 (also known as HX 1.67) lenses are thinner than High Index 1.60, CR-39 or glass. Recommended sphere range is 0.00 - +/-16.00
• Glass lenses feature superior optical quality and scratch resistance. Although glass is heavier and thicker than other lens materials. Recommended sphere range is 0.00 - +/- 3.00