![]() To enhance contrast sensitivity, the IOL optic technology relies on an anterior wavefront-designed aspheric surface to compensate the average positive spherical aberration of the cornea. The Tecnis Symfony ® IOL (Johnson & Johnson Vision, Santa Ana, CA, USA) was the first ERV IOL approved by the US Food and Drug Administration in July 2016. 4, 5 To minimize these drawbacks and to enhance the intermediate focal plane, modern enhanced depth of focus (EDOF) and extended range of vison (ERV) lenses were developed, incorporating new technical features in their optical designs. 1 – 3 Additionally, traditional multifocal IOLs showed weaknesses in providing satisfactory intermediate vision. The split of light has been shown to reduce contrast sensitivity and increase the risk of disturbing photic phenomena. All of them use the principle of simultaneous vision, in which light is split into two or more focal points, requiring the patient to concentrate on multiple coexisting retinal images to undertake a visual task at a specific distance. 1 Nowadays, there are various optical designs available for multifocal IOLs, like refractive, diffractive, and hybrid refractive-diffractive lenses. ![]() Multifocal intraocular lenses (IOLs) represent a safe and effective solution to achieve spectacle independence after cataract surgery or refractive lens exchange, providing a surgical option for presbyopia correction with high patient satisfaction.
0 Comments
Leave a Reply. |