Yes, you must have a valid prescription under the applicable provincial territorial laws. Please ensure that your order is exactly the same as the prescription that was given by your eye care provider and that thre lenses fit your eye comfortably. We do not take responsibility for any medical problems which might occur.
If you are currently using contact lenses, look for one of your contact lens boxes. They contain the information you need such as power, diameter and base curve. If you are not sure about how to read the information from your contact lens boxes, we hope the graphic below can be of some assistance.
How to find the lens data on your contact lens boxes