General Conditions
  CR-39 Hard Resin Lenses
  1.56 Middle Index Hard
  Resin Lenses
  1.56 Photochromic Hard
  Resin Lenses
  1.59 Polycarbonate
  Lenses
  1.61/1.67 Hi-Index Hard
  Resin Lenses
  Mineral White 1.523
  Optical Lenses
  Mineral 1.7/1.8/1.9
  Hi-index Lenses
  Mineral Photochromic
  Lenses
  Sunlens & Polarized
  Lenses
  Coating
  Quality Control of Lenses
  Package of Lenses
 
 
 Coating
 
Coating Structure
If necessary, additional hard-coating, AR (anti-reflection) multi-coating, HMC+EMI coating and Hydrophobic (waterproof) coating will be provided. Coating structure is as follows.
Structure of Coatings Ultrasonic Cleaning
   
Hard Coating  
After thorough preparation, the plastic lenses are given a hard protective coating by dipping them into a polysiloxane lacquer. The lacquer is optimally matched to the base lens and the coating structure, it is reinforced by nano-particles to increase hardness and abrasion resistance.

Pencil hardness of non-tintable hard-coating is up to 7H; pencil hardness of color tintable hard-coating is up to 6H.
Hard Coating
AR+EMI Coating  
Now, most ophthalmic lenses have AR (anti-reflection) multi-layer coating which is applied in a vacuum deposition system, some lenses also have Anti-EMI coating (Electro Magnetic Interference Blocking). The multi-layer, broad-band anti-reflection coating is applied in a vacuum coating machine. The coating provides optimum transparency with very low residual reflection.
Transmission Comparison with White Clear Un-coated Lens  
  Un-coated Single Layer AR Coated Multi-layer (MAR) Coated
Transmission Rate 92.0% 96.0% 99.2%  
Light Loss 8.0% 4.0% 0.8%  
 
  Anti-reflection Multi-layer Coating
Hydrophobic Coating  
The hydrophobic coating is the last layer in coating package, it provides the lens an extremely smooth surface. This makes the lens extremely repellent to dirt, water and can be easily cleaned.
 
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