Which of the following lenses typically provides better optical clarity?

Glass lenses are known for their superior optical clarity due to their lower light distortion and higher refractive index compared to many other lens materials. This means that light passes through glass with minimal scattering, which helps in providing a clearer and sharper vision. Additionally, glass tends to resist scratches better than plastic lenses, which can also contribute to maintaining optical clarity over time.

While other materials like CR-39, polycarbonate, and high-index plastic have their advantages—such as being lighter or more impact-resistant—none typically match the optical quality offered by glass. Glass lenses are generally thicker and heavier than their plastic counterparts, but their clarity makes them a preferred choice for those who prioritize visual acuity over other factors.