Types of Coatings on Lenses

CR39 lenses are a popular choice for eyewear due to their lightweight and clear optical properties.

Following are some common types of coatings applied to CR39.

Hard Coating

A clear, durable coating makes CR39 lenses somewhat resistant to scratches, enhancing their durability without compromising clarity. It protects lenses from everyday wear and tear, extending their lifespan.

These are ideal for everyday use, providing reliable vision correction at an affordable price. Despite being termed 'hard-coated,' they are not as scratch-resistant as glass lenses.

Photochromic Coating

A coating that allows lenses to darken in response to sunlight and clear up indoors. They're effective at providing comfort by adjusting to changing light conditions, protecting your eyes from UV rays, and reducing glare. They offer practical benefits for people who move frequently between indoor and outdoor environments. However, they may not darken as effectively inside cars due to UV-blocking windshields. Not everyone needs Photochromatic lenses.

Blue Block Coating

A coating that filters out blue light emitted from digital screens and artificial lighting. It claims to reduce eye strain and improve sleep by filtering out blue light.

Eye Strain: Some people find these lenses helpful for reducing eye discomfort from long hours in front of screens, but studies show mixed results.

Sleep: They may help improve sleep by reducing blue light exposure, which can disrupt sleep patterns, especially at night. But, you can also reduce blue light exposure by increasing the sleep or night mode setting on your device.

Long-term Eye Health: There's no strong evidence yet that blue light blocking lenses prevent serious eye conditions like macular degeneration.

Good screen habits, like taking breaks and avoiding screens before bed, are important.

You may opt for photochromic coating to get protection from UV rays and bright light.

Anti-Reflective (AR) Multi-Coating

A multi-layer coating that reduces reflections and glare on the lens surface. Enhances visual clarity and comfort, especially in low-light conditions, and improves the appearance of the lenses by making them less reflective.