High Index lenses:
High index lenses are made of a plastic material which bends light more than standard lenses and can therefore be made thinner and lighter allowing for more cosmetically appealing and comfortable to wear glasses.
They are 25-50% thinner, lighter and stronger than standard plastic lenses. Therefore, we would recommend them for high prescriptions or rimless frames.
3 Main High Index lenses:
Thin (1.60 index) = 25% thinner
Ultra Thin (1.67 index) = 40% thinner
Ultra Ultra Thin (1.74 index) = 50% thinner
High Index Lenses Thickness Comparison:
1.60 High Index Lenses are on average 20% thinner than ordinary CR39 plastic.
1.67 High Index Lenses are on average 35% thinner than ordinary CR39 plastic.
1.74 High Index Lenses are on average 50% thinner than ordinary CR39 plastic.
This example shows the difference in thickness for high index lenses.