How do I determine the amount (degrees) of rotation on a soft toric lens?
Look at the lens on the eye, and visualize the face of a clock over the lens. Frequency Xcel Toric lenses have one laser mark at the base of the prism. In most cases this laser mark will position at what would be 6 o’clock. In this situation the lens has no rotation or “is sitting at 90” indicating no need to change the axis. See clinical case studies for examples of exceptions. If the lens is positioned at either 7 o’clock or 5 o’clock, then the lens is rotating 30 degrees. Each hour on the clock is equal to 30 degrees. A lens rotating half way between the hours on a clock is considered to be rotating half of 30 degrees for a total of 15 degrees.
