Which lens material has the lowest Abbe value?

Polycarbonate is indeed associated with the lowest Abbe value among the listed lens materials. The Abbe value, also known as the Abbe number, measures the dispersion of light in a material, which is an indicator of how much prism will be created when light passes through that material. Lower Abbe values correspond to greater chromatic aberration, meaning that colors will not converge at the same point, leading to potential visual distortions.

Polycarbonate, with its lower Abbe value, experiences more color fringing than other materials like CR-39 plastic or glass. This characteristic makes it less desirable for patients who are sensitive to visual distortions, even though polycarbonate is known for its high impact resistance and lightweight properties, making it popular for safety glasses and children's eyewear.

On the other hand, high-index plastic and CR-39 typically have higher Abbe values, resulting in less chromatic aberration and better overall image quality when compared to polycarbonate. Glass generally has an even higher Abbe value, making it an excellent choice when optical clarity is paramount. However, its weight and susceptibility to breakage limit its practical applications in many scenarios.

In summary, polycarbonate has the lowest Abbe value, contributing to increased chromatic aberration