SF 1.56,1.591PC Photo Grey, Brown Blue Cut UV420 Round Top, Flat Top, Invisible Bifocal

The SF Photo Grey/Brown Blue Cut UV420 Bifocal Semi-Finished Lens combines multiple protective functions into a single versatile optical solution.

The lens darkens to grey or brown under sunlight to reduce glare and eye strain, while maintaining clear vision indoors. Blue light cut performance helps reduce digital eye fatigue caused by prolonged screen exposure. The bifocal structure provides distinct distance and near zones, ensuring reliable vision correction for reading and daily activities.

Available in Round Top, Flat Top, and Invisible bifocal designs, the lens meets different functional and aesthetic requirements. With a refractive index of 1.56 or 1.591, it offers stable optical performance and efficient processing. As a semi-finished lens, it enables precise customization by optical laboratories, making it suitable for premium multifunctional bifocal eyewear programs.