Prescription contacts are shipped from an external warehouse and the delivery time is longer.
The pupil hole size is smaller than normal color lenses, so it can obstruct vision when wearing it.
This model is also available in a non-prescription version here
Storing and Cleaning Contact Lenses:
Contact lenses must be stored in a suitable contact lens case, which keeps them clean, soft and safe to use. Fill the lens case with a disinfecting solution before placing the lenses inside. Make sure that they do not dry out. Never borrow another person’s contact lenses nor lend them yours. They should be handled with care, as they are very soft and delicate.