Tom Ford Blue Block Navigator Optical features an ultra-slim glossy acetate frame with blue-block lenses, providing screen protection and easy prescription fitting. Key attributes: Black | Nero lucido | Acetate | Blue-block lens protection | Prescription-ready lenses | Navigator silhouette | Ultra-slim glossy acetate frame | Shiny metal T logo on front | Dimensions & fit: 57-13-140 | 57 mm | Composition & care: Acetate | Metal components | Blue-block treated lenses | Wipe lenses with a microfiber cloth; store in provided case; avoid abrasive cleaners and high heat.