1. www.viscotland.org.uk/textimages/viscotland/medinfo/Diagnosis/Glases.doc.
2. ISO 14889, Section 4.5 Ophthalmic optics—Fundamental Requirements for Uncut spectacle Lenses.
3. ISO 8980—3 Uncut Finished Spectacle Lenses—Transmittance specifications and Test Methods.
4. ANSI Z 80.3 Ophthalmic—Non Prescription Sunglasses and Fashion Eyewear Requirements.
5. ANSI Z 80.1 Impact Resistance for Lenses.