**2.3 Extended depth of focus IOLs**

Extended depth of focus (EDOF) IOLs are a newer category of IOLs that aims to give an elongated focus of vision, that enhances depth of focus rather than introduces several foci. It can reduce photic phenomena, glare, and halos, which have been reported in traditional multifocal IOLs. Tecnis Symfony IOL (Abbott Medical Optics) was the first EDOF IOL approved in 2016 by the U.S. Food and Drug Administration (FDA) (**Figure 3**). Now, there are several EDOF IOLs had been released in the market which had combined with different techniques such as diffractive optical design, spherical aberration, chromatic aberration, pinhole effect [11]. American Academy of Ophthalmology has provided consensus

**Figure 3.** *EDOF IOLs: Symfony IOL.*


#### **Table 1.**

*Properties of popular premium intraocular lenses (IOLs) [10, 11].*

statement for EDOF IOL. These should have an extended far focus area which reaches the intermediate distance, providing excellent intermediate vision. Depth of focus should be at least 0.5 D wider than monofocal IOL for distance visual acuity of 0.03 logMAR [12]. Nevertheless, in practice, EDOF lenses provide excellent intermediate vision, but inadequate quality of vision for near distance [13, 14] (**Table 1**).
