# Design Factor of IOLs for Barrett formula

Here are the suggested ** Design Factors** of some common Intra Ocular Lenses for the Barrett Universal formula. If you are looking for Lens Factor (LF) for Barrett Universal II formula, then click on

__https://www.quickguide.org/post/a-constant-to-lens-factor-lf-conversion-for-barrett__

The design factor or DF of the Barrett Universal formula indicates when the IOL optic transforms from a biconvex design to a meniscus shape in case of low power IOLs. For example, in case of Alcon AcrySof lens, the IOL powers of 6 to 34 diopters are biconvex in design. All lens power below 6 diopter are available in meniscus design on the Acrysof platform (MA60MA). **Therefore the DF or design factor of Alcon AcrySof lenses are 5. That is from this all lenses above this model are biconvex in design**.

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IOL power range

IOL design (Biconvex, meniscus) for the power range.