After that point, they start to taper off.
They will taper off gradually, so that neither you nor anyone else should notice much change before you go in for your next appointment.
Your doctor may have you taper off of valerian before surgery or may simply adjust the anesthesia accordingly.
If you have been taking valerian for more than a month, it is wise to taper off gradually to avoid any unpleasant symptoms.
Essentially, what that means is that the lenses are round, but they taper off into a slight point at the corner of the eyes.