Two products carry the Infuse name here: Infuse in a 90 pack and Infuse Multifocal in a 90 pack. Both are soft contact lenses, and both sit in our Contact Lenses category. It is a small, straightforward range, and the only real question is which of the two your prescription names.
The difference between them is the correction. The standard Infuse lens carries a single power. Infuse Multifocal carries more than one power within the lens, which is what a prescription with an add value calls for. This is not a preference you switch between at checkout; it is set at your fitting and written on your prescription.
A contact lens prescription is more specific than a glasses prescription. It names the lens by brand, and it gives a power, a base curve and a diameter, with an add for a multifocal. Those numbers are tied to the exact lens on the page. Check that the brand, the version and the pack size on your prescription all match the box before you order.
Both products come in 90 packs. Lens boxes are sold per eye, so an order for both eyes is two boxes, and the two eyes often need different powers. It is worth keeping both sets of parameters written down somewhere you can find them, because reordering takes a minute when the numbers are at hand and much longer when they are not.
An expired or missing prescription is a reason to see your eye care professional rather than to work backward from an old box. Fit can change over time, and the practice that fitted you holds the record.