Convert a Multifocal Rx to Single Vision
Use this calculator to convert a multifocal Rx to a single vision reading or intermediate Rx.
Converting a multifocal perscription to single vision is done by combining some or all of the reading add power with the distance power.
- To convert to a single vision reading Rx you simply increase the sphere power of the distance Rx by the full amount of the 'add' power.
- To convert to a single vision intermediate Rx you increase the sphere power of the distance Rx by a percentage of the 'add' power. This percentage is typically around 50%, but other percentages are possible depending on needs of the wearer.
Enter the multifocal Rx*
Percent of add power
Converted Single Vision Rx*