1. More uniform after color change than spin coating.

2. Material photo chromic and blue block, more stable, can be stored for a long time, the cost is lower.

3. More functions of one lens. Indoor can block harmful blue light from mobile phone, computer and TV. Outdoor can change color to prevent the reflection and dazzle caused by sun light.

4. Able to produce progressive, flat top, round top, invisible bifocal.

5. Two coating color choices: blue and green.

6. Super hydrophobic, stronger, anti-scratch, dustproof and easy to clean.