1. Vouchers towards the cost of glasses or contact lenses 2. If you need certain very strong lenses . 3. If you need certain very strong lenses . 4. Especially when viewed through the monochromatic lens 5. Vouchers towards the cost of glasses or contact lenses 6. Vouchers towards the cost of glasses or contact lenses 7. To get back money which you have spent on glasses or lenses 8. To get back money which you have spent on glasses or lenses 9. As a lens through which most people view moral questions, 10. Or in how much they pay for the lenses or consumables,
