The constant is a theoretical value that relates the lens power to AL and keratometry, it is not expressed in units and is specific to the design of the IOL and its intended location and orientation within the eye.
The constant is a theoretical value. This theoretical value relates the lens power to AL. It is not expressed in units. This was keratometry. It is specific to the design of the IOL. This is keratometry. It is specific to its intended location and orientation within the eye. This is keratometry.