Laboratory scienceTopography and longitudinal chromatic aberration characterizations of refractive–diffractive multifocal intraocular lenses
Section snippets
Multifocal Intraocular Lens Descriptions
Seven IOLs were studied and compared. For comparison with purely refractive components, two monofocal IOL with two characteristic biomaterials and Abbe numbers were also included in the study. The study was limited to a base power labeled to 20.0 diopters (D). This corresponds to the far focus power of a multifocal IOL used to achieve emmetropia in an “average” pseudophakic eye.
- 1.
Pupil-Independent Fully Diffractive Bifocal Multifocal Intraocular Lens The Tecnis ZMB00 is a pupil-independent, fully
Intraocular Lens Surface Topography
Diffractive topographies were obtained once the main IOL curvature had been extracted. Figure 2 shows these topographies. All the multifocal IOLs studied in this paper were found to present diffractive profiles, and a number of these exhibited alternating step height variation.
In diffractive multifocal IOLs, the main curvature provides the main power of the lens. It is often associated with far vision, which is mainly driven by the refractive elements of the IOL. There are, however, a few
Discussion
The chromatic properties of the different IOLs characterized in this study are summarized in Figure 13. For each focus, chromatic effects were computed as a variation of power shift according to the wavelength. Therefore, histogram bars in the positive range of the graph correspond to foci that exhibited less power in blue light than in red light, and vice versa for the bars in the negative range.
As expected, Figure 13 shows that in most cases, the longitudinal chromatic aberration related to
References (15)
- et al.
Comparison of bifocal and trifocal diffractive and refractive intraocular lenses using an optical bench
J Cataract Refract Surg
(2013) - et al.
Design and qualification of a diffractive trifocal optical profile for intraocular lenses
J Cataract Refract Surg
(2011) - et al.
Visual performance of a quadrifocal (trifocal) intraocular lens following removal of the crystalline lens
Am J Ophthalmol
(2017) - et al.
Optical bench performance of 3 trifocal intraocular lenses
J Cataract Refract Surg
(2016) - et al.
Multi-ring lens, systems and methods for extended depth of focus. US patent 9335563B2
- et al.
Optical quality differences between three multifocal intraocular lenses: bifocal low add, bifocal moderate add, and trifocal
J Refract Surg
(2013) - et al.
Optical performance of two new trifocal intraocular lenses: through-focus MTF and influence of pupil size
Clin Experiment Ophthalmol
(2014)
Cited by (36)
Multifocal and Extended Depth-of-Focus Intraocular Lenses in 2020
2021, OphthalmologyCitation Excerpt :Depth of focus extension per se can be achieved in only 2 ways: narrowing the aperture (as photographers do with the camera’s diaphragm, such as with an IC8 lens) or using higher-order aberrations (HOAs) such as spherical aberration (e.g., Isopure or Vivity [Alcon Laboratories, Fort Worth, TX]). Any diffractive system relies on discrete foci generation (Symfony has been shown to be a bifocal distance and intermediate lens with chromatic compensation)17 and a zonal refractive system with discrete zones that also are providing discrete foci, as long as these zones are distinct. If the zones are blended (e.g., Vivity), it falls into the category of lenses using HOAs (there are no zones anymore but rather, a global zone with aspherical design).
Characterizing glare effects associated with diffractive optics in presbyopia-correcting intraocular lenses
2024, Journal of Cataract and Refractive SurgerySpatio-chromatic vision with multifocal diffractive intraocular lens
2023, Eye and VisionCharacterization of diffractive bifocal intraocular lenses
2023, Scientific Reports