A feature called 'Stepper Text' is available which provides the ability to enter power values in 1/8 diopters. This feature must be enabled by Customer Support.
Before Stepper Text is enabled, all power fields automatically default to quarter diopters and will round to the nearest quarter diopter if an invalid power is entered. Once Stepper Text is enabled, any value can be entered for power. However, it will no longer round to the nearest quarter diopter.
This feature cannot be disabled once it has been enabled because it would cause historical data to revert to a rounded value. Stepper Text is available by default for RGP contact lenses.