Four SofLens options appear on our site, and they are not interchangeable. Each answers a different kind of prescription, so the right one is already decided by the piece of paper from your eye exam.
Start with your prescription rather than the product list. It names the exact lens, the power for each eye, and the base curve and diameter, and those numbers have to match. Right and left eyes are often different, so check both lines before you set quantities.
After that it is arithmetic. A 6 pack of reusable lenses covers a set number of wear cycles depending on the schedule you were given, and needs solution and a case alongside it. A 90 pack of dailies covers about three months of daily wear per eye and needs nothing else.
Contact lenses are prescription products in the United States, so an order needs a current prescription from your eye doctor. If yours has expired, or your comfort or vision has changed since your last fitting, book an exam before reordering rather than repeating the previous order.