National NA0347 Bifocal Prescription Eyeglasses

National NA0347 Eyeglass Frames Description:

• Frame Type: Plastic
• Shape: Round
• Flex Temple: No

Package Contents:

• Genuine National NA 0347 Prescription Rx Eyeglasses with Lined Bi-Focal Lenses

National Eyeglasses Prescription Information:

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

Available National NA0347 Rx Lens Styles:

• National Rx Prescription NA0347 Eyeglasses with Single Vision Rx Lenses
• National Prescription NA0347 Eye Glasses with Rx Lined Bi Focal Lenses (presented above)
• National Prescription NA0347 Eye Glasses with Rx No Line Progressive Rx Lenses

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

National NA 0347 Eyeglasses frames without prescription lenses

National Bifocal 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