The Defocus Curve provides a wealth of information that can sometimes be difficult to interpret by looking at the results for each defocus in isolation.

Defocus curve offers comprehensive information about what is the mean behavior of a multifocal procedure. However, a non-optimal analysis of the obtained data can lead to misinterpretation of the results. In this article, we are going to cover two problems in the statistical analysis of defocus curves.

This article discusses the fitting of the constant in intraocular lens (IOL) calculation. It highlights the technological evolution and the concept of Effective Lens Position (ELPo). It presents vergence and thick lens equations, and mentions the Haigis formula with multiple regression.

Optimal tests for measuring Contrast Sensitivity with Simultaneous Vision optical systems, such as Intraocular Lenses or Multifocal Contact Lenses.