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There are five options to improve our knowledge about lenses.
1. Hard Coating
| For Power upto | Recommended | The lens thickness is reduced with increase in refractive index |
| ± 2.00 D | 1.50 | |
| ± 4.00 D | 1.56 | |
| ± 6.00 D | 1.61 | |
| ± 8.00 D | 1.67 | |
| > ±10.00 D | 1.74 |
Aspheric design in Hi index lens
Prime Glass 1.8 index is 15% more thinner than Plastic 1.74 index & 1.9 is 20% thinner than 1.74 index