If group vision insurance is available from your employer, you pay for it through payroll deductions or flexible spending accounts.
A flexible spending account, sometimes referred to as a cafeteria plan, allows an employee to use pre-tax dollars to purchase selected health benefits such as vision insurance. This plan saves your money because you receive the full benefit of income that has been set aside for health costs, making it not subject to or reduced by taxation.
If you are self -employed or if your employer does not offer vision insurance then you can expect to be billed monthly or annually.