If you have presbyopia and are a candidate for multifocal contact lenses, your eye care professional will give you a prescription and also suggest the best lenses for you.
You can buy multifocal contact lenses online by adding your lens parameters into the appropriate fields just as you normally would for other lenses.
Your new multifocal prescription will contain a field for ADD (addition), or the correction needed to see clearly close up. This number ranges from 0.50 to 3.00 (values up to 1.25 are regarded as low, up to 2.00 as medium and up to 3.00 as high).