Study: Ray visualization of diffractive optics with enhanced
A Study was conducted to assess the optical behavior of a new diffractive intraocular lens (IOL) and compare its performance to that of an established extended-depth-of-focus (EDOF) IOL.

The Proming EDOF Multifocal AM2UX and the AT LARA 829MP were tested in this analysis. The ray propagation of the IOLs was visualized using an experimental set-up that included 0.01 % fluorescein solution and monochromatic light (532 nm). On the optical bench OptiSpheric® IOL PRO II, the optical efficiency of the IOLs was also measured by calculating the modulation transfer function (MTF) values at 50lp/mm and 3.0 and 4.5 mm apertures.

Results:
--The ray propagation of the two IOLs showed two distinct foci. Light intensity assessment revealed that both IOLs allocate more energy to primary than secondary focus.

--At 3.0 mm pupil, the MTF values at 50lp/mm for the primary focus were 0.39 and 0.37, and for the secondary focus, 0.29 and 0.26 for the AT LARA and Proming IOLs, respectively.

--At 4.5 mm pupil, the single-frequency MTF for the primary focus was 0.51 and 0.24 and for the secondary focus 0.21 and 0.15 for the AT LARA and Proming IOLs, respectively.

Finally, the Proming acted like a low-add bifocal lens when measured under monochromatic conditions with an aberration-free model cornea; however, its properties were similar to those of the well-known AT LARA EDOF IOL. At low defocus (up to 2D), the AT LARA outperformed the Proming, but the latter had better image quality in the 2-3D range.

Source: https://bmcophthalmol.biomedcentral.com/articles/10.1186/s12886-021-01958-8
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