Dioptrical lenses - Materials

Mineral
Plastic
CR39
Trivex
NXT - more about NXT

 

MINERAL LENSES

MINERAL (MIN)
Good optical features
Hard coated, antiscratch
Use to maximus +2,0 D a nad -3,0 D because over these values it becomes to heavy.

Index 1,523
Abb number 59
Mf-sf in dB 5
Spec.gravity 2,61 g/cm3
UV filter UVA70%, UVB 99,9%
pri 330 nm

 

PLASTIC LENSES

CR39
Good optical features
Double side hard coating, antiscratch, antireflex

Index 1,56
Abbe number 37
Mf-sf v dB 1,23 g/cm3
Specific gravity UVA 99%, UVB100%
pri 370 nm

 

POLYKARBONATE LENSES

POLYCARBONATE (PC)
25%-35% thinner than normal PC
20% lighter that normal PC
very good resistance against scratch
Antireflex coating light transmission up to 99,5 %.
extremly durable against break

Index 1,53
Abbe number 45
Mf-sf v dB 1,11 g/cm3
Specific gravity 1,11 g/cm3
UV filter UVA 100%, UVB100%
pri 394 nm