1.56 Photochromic Bifocal Lens For Indoor & Outdoor Use Glasses

1.56 Photochromic bifocal lenses are dual-purpose eyeglass lenses that combine two key features:

1. Automatic Light Adjustment: They contain light-sensitive molecules that darken automatically when exposed to UV sunlight (becoming tinted sunglasses) and clear up indoors or at night.

2. Two Vision Corrections: They feature a distinct bifocal segment (usually a visible line or a seamless progressive zone) to provide clear vision for both distance (top portion) and near tasks like reading (bottom portion).

In short: They are "all-in-one" lenses that act as both regular glasses and sunglasses while correcting both distance and near vision.