1.56 Mid Index Lenses
Mid Index Plastic Resin Lenses: Not presently supplied by Budgetspex Information Only
1.56 Index Not supplied by Budgetspex due to it's poor tensile strength
- This lens is slightly thinner than the preferred and much stronger 1.50 index standard Cr 39.
- It's value becomes evident when mid range prescriptions are fitted into ful rimmed frames.
- 1.56 index lenses usually have a slightly flatter curve, giving a cosmetically more flattering appearance
Lens Thickness Comparison |
-6.00 |
+4.00 |
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1.50 Index Our standard lens is single vision 1.5 index Cr 39 plastic resin and is adequate for most people |
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Mid Index Lenses |
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1.56 Index The tensile strength of this index is lower than any other in general, although some brands have overcome this problem. It is slightly thinner than 1.50 but its lack of strength renders it unusable for Rimless. |
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High Index Lenses |
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1.59 Polycarbonate is often described as and rounded to 1.60 |
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1.60 Index Our lowest priced thinner lens. |
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1.67 Index Our mid priced thinner lens is ideal for rimless designs. |
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1.74 Index The thinnest plastic lens currently available, very thin very light has both UV400 protection and antireflection coating as standard, very flat, this item is not held in stock by budgetspex but is available usually within two days. |
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As you can see demonstrated in the above chart, the saving in lens thickness is most dramatic when used in high minus prescriptions
