Attribute: lens_material

Substance(s) an optical lens is made out of. Sample values: Plastic, Glass, Trivex. * To provide multiple values using a single feed lens_material field, the acceptable input format is 'Plastic', 'Glass', 'Trivex'. * To provide multiple values with one value per feed field, use feed field names, such as lens_material[0], lens_material[1]. For example, the acceptable attribute value input format for fields such as this is Plastic.