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WebUSA shipping for entire order: $4.95 (International from $9.95) Most USA orders delivered in 7 to 14 business days. Progressives from $27.95 Bifocals from $17. Premium Anti-Glare Coating: $4.95 Sunglass Tint: $4.95. Super Hydrophobic water-repelling A/R coating $8.95. Oleophobic fingerprint-resistant A/R coating: $14.95. Web"Photo- gray" lenses for eyeglasses darken in bright sunshine because lenses contain tiny, transparent AgCl crystals. Exposures to light removes electrons from Cl^- ions, forming a chlorine atom in an excited state (indicated below by the asterisk): Cl^- -->hn Cl* + e^- The electrons are transferred to Ag^+ + e^- ---> Ag functional group in ethanol
The 11 Best Blue Light Glasses for 2024 Tested by Health
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