It means that there are 2 identical contact lenses in one box. They are packed like this by the manufacturer and we never unpack a sealed box. If you need different prescriptions for each eye, you need to buy two boxes, each pair with a different prescription. That way you will receive 2 pairs of contact lenses. If you wear the same prescription in both eyes, all you need is one box, which you can select from a drop down menu for either eye (left or right).
This is a medical device.
Use it according to the instructions for use or the label.