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  Lens Coating System
  Quality Control of Lens
  How to Pack the Lens
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Coating
 
Coating Structure
If necessary, additional hard-coating, AR (anti-reflection) multi-coating, HMC+EMI coating and Hydrophobic (water proof) coating will be provided. Coating structure is as follows.
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 upto 7H; pencil hardness of color tintable hard-coating is upto 6H.
Hard Coating
   
AR+EMI Coating  
Now, most ophthalmic lenses are given AR (anti-reflection) multi layer coating which is applied in a vacuum deposition system, some lenses also come with 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 Characteristics of White Lens  
  Un-coated Single Layer AR Coated Multi Layer (MAR) Coated
Transmission Rate 92%      96%     99.2%
Light Loss   8%      4%     0.8%
   
Hydrophobic Coating  
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 easily to be cleaned.
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