Cylinder Parameter On Your Prescription

For toric (for astigmatism) contacts, cylinder is a number from 0.00 to +,-10.00 following the words "Cylinder" or "Cyl" on your prescription form. If your prescription is written as a string of numbers (e.g., "-3.00, -1.75 @ 180"), the second number in the string usually represents the Cylinder. Some doctors enter cylinder with the "-" sign, and some without, but in both cases they designate the same exact lens (e.g., Cylinder -2.25 and Cylinder 2.25 are the same).