4 Best standard-index eyeglass lenses

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Traditional lenses suitable for mild to moderate prescriptions, offering affordability and reliability. Standard-index lenses are the conventional choice for eyeglasses, typically made from materials like CR-39 plastic with an index of refraction around 1.5. These lenses offer good optical quality and are cost-effective for mild to moderate prescriptions. While thicker than higher index options, they remain suitable for many wearers and are often more impact-resistant. Standard-index lenses are a practical choice for those with lower prescription strengths or as backup pairs, providing a balance of functionality and affordability.
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