when ordering multifocal what is the add
The first sign that you may need multifocal contact lenses is if your prescription for glasses has numbers in the ADD column. Numbers in this column indicate that you are presbyopic to some extent. Although there is no set limit to what the ADD number can be, it usually ranges between +0.75 to +2.50. The higher your ADD number is, the more you stand to benefit from multifocal contact lenses. But more importantly than the ADD number, is how bothered you are by your vision up close.