Theoretical Effect of Lens Position and Corneal Curvature on the Near Focal Point of Multifocal Intraocular Lenses

To determine the effect of lens position and corneal curvature on the near focal point of different multifocal intraocular lenses.

Near focal points for various multifocal intraocular lenses were calculated using a refractive vergence formula. Median, high, and low values for lens position and corneal curvature were used.

Lens position and corneal curvature both affected the theoretical near point of multifocal intraocular lenses. The effect was more pronounced for lower power adds. There was overlap of near focal points for the different near adds of the Tecnis multifocal lenses (AMO, Abbott Park, IL) across the range of lens positions and corneal curvatures seen in a normal population.

Clinicians need to be aware of the effect of lens position and corneal curvature on the near focal point of intraocular lenses.