EDOF – HOW DOES IT WORK?

EDOF is the name of a new category of intraocular lenses that are a kind of compromise between traditional monofocal and trifocal IOLs. Monofocal IOLs allow you to have good vision at one distance with high quality. Multifocal, on the contrary, give sufficient visual acuity at various distances, but are characterized by the presence of a large number of dysphotopsias. Intraocular lenses with extended focus provide greater independence from glasses than monofocals while maintaining high quality vision. Objective: to discuss the available information on the principles of EDOF imaging by lenses and the dependence of the state of the wavefront of the artiphakic eye on the combination of spherical corneal aberrations and IOLs. The wavefront of the eye is formed by several structural elements, the main of which are the cornea and the lens (artificial lens). The study of aberrations of the human eye is in the field of refractive surgery. Attempts to use aberrations in cataract surgery began with the creation of aspherical IOLs. The latter were intended to correct spherical corneal aberrations and were aimed at improving the characteristics of the wavefront. The development and use of aspherical IOLs were based on data on the state of the cornea of the average eye and gave a conditional effect. The new generation of IOLs based on the creation of a certain number and type of spherical aberrations is designed to modify (deform) the wavefront of the artifakic eye and expand its optical capabilities while maintaining a low number of dysphotopsias. This, in a way, revolutionary change in trends brings cataract surgery even closer to refractive surgery. According to the authors, for the fullest use of the capabilities of IOLs from the EDOF category, it is necessary to apply the principles and experience of refractive surgery in terms of studying the characteristics of the operated eye and correlating them with the parameters planned for IOL implantation.