Barner lenses have a specialized coating for indoor use, protecting against blue-violet and LED light from digital devices. They reduce eye fatigue, glare, and CVS while improving focus, posture, sleep cycles, and overall well-being.

CR-39 lenses block 100% of blue light at 380-405nm and 45% at 410-450nm. Reading glasses block 100% at 380-405nm. Premium Index 1.67 lenses provide 45% protection at 380-405nm.

Anti-Blue Light lenses use CR-39 material with four coatings (hardened, anti-reflective, antistatic, super hydrophobic). Neutral sunglasses have lightweight TAC polarized lenses (filter category 3). Prescription sunglasses use CR-39 lenses with four coatings.

Options include TR-90 (flexible polycarbonate), Italian acetate, stainless steel with nickel arms, sustainable Rilsan (45% bio-based from castor seeds), and bio-acetate (cotton fibers and wood pulp).

Yes, in these ranges: Sphere +8.00 to -16.00, Cylinder +4.00 to -4.00, Axis 0 to 180. Only single-vision (monofocal) lenses are produced; progressive lenses are currently unavailable.

Yes, with powers of +1.00, +1.50, +2.00, +2.50, and +3.00. No additional charge for reading lenses.

Use the original cleaning cloth for fingerprints and dust. For additional cleaning, use pH-neutral soap with lukewarm water. Avoid alcohol, solvents, and abrasive products. Store in the original case at temperatures between -20°C and 40°C.

A two-year warranty covers manufacturing defects. Damage from misuse, neglect, normal wear, scratches, accidental breakage, or changes in vision are not covered.