Optima 38 Bausch & Lomb 1 Lens Per Box Yearly Usage Contact lenses by Contact Lens-Spherical is a soft spherical contact lens product listed for yearly replacement soft spherical contact lens. The supplied inventory specifies a base curve of 8.7 mm and a diameter of 14.0 mm, helping customers identify the listed lens parameters. Check the exact lens power and replacement schedule on the packaging, and confirm that the lenses match your current prescription before purchase.