The maximum power for disposable contact lenses are usually manufactured up to -12.00. Some standard contact lenses can go up to 14.oo. However, different brands may have different prescription strengths for contact lenses.
According to the American Optometric Association, most contact lens wearers are nearsighted. Stock brands average from 8 diopters (written as +8.00 for farsighted prescriptions) to 12 diopters (written as -12.00 for nearsighted prescriptions). Different contact lens companies make lenses in various strengths. Your doctor can determine which lens is best for your eyes and whether custom lenses can be prescribed in a higher strength.