CR39 lenses are a type of plastic lens made from a material called allyl diglycol carbonate, commonly known as CR39. Here are the detailed information about CR39 lenses:
* Material: CR39 (allyl diglycol carbonate)
* Index of Refraction: Usually around 1.498 or 1.499, indicating how much the light is bent as it passes through the lens.
* Abbe Value: Approximately 58-60, which measures the dispersion of light within the lens. Higher values indicate less chromatic aberration.
* Density: Around 1.32 g/cm³, indicating the mass of the material per unit volume.
* UV Protection: CR39 lenses can be coated to provide UV protection, shielding the eyes from harmful ultraviolet radiation.
* Impact Resistance: While CR39 lenses are not as impact-resistant as polycarbonate or Trivex lenses, they still offer reasonable durability.
* Thickness: CR39 lenses are generally thicker than high-index lenses, especially for stronger prescriptions, which can affect the aesthetics of the glasses.
* Coatings: They can be coated with anti-reflective, scratch-resistant, and hydrophobic coatings to enhance visual clarity, durability, and ease of cleaning.
* Color Options: CR39 lenses come in a variety of tint options, including clear, photochromic, polarized, and tinted lenses for sunglasses.
* Availability: CR39 lenses are widely available and are commonly used in prescription eyewear due to their optical clarity and affordability.
When describing CR39 lenses, it's important to mention their optical properties, impact resistance, UV protection, coatings, and available options to provide a comprehensive understanding of their specifications.
