Spectacle frames

• Finding eyeglasses with the qualities that are most important to you could be as simple as choosing the right frame material, because each type has its own unique strengths.
• If you want the colors of the rainbow, then zyl (zylonite, or cellulose acetate) is your material.
• Eyeglasses made of nylon first were introduced in the late 1940s. Because of brittleness and other problems, eyeglass manufacturers switched to blended nylon (polyamides, co-polyamides and gliamides).