Through-Focus Evaluation Of Premium Intraocular Lenses Using A Realistic Eye Model And A Novel Image Quality Metric
Published 2024
- 42nd Congress of the ESCRS
Reference: PO546
| Type: Free paper
| DOI:
10.82333/zt7b-2936
Authors:
Harilaos Ginis* 1
, Dimitrios Christaras 1
, Spyridon Tsoukalas 1
, José María Marín 2
, Pablo Artal 3
1diestia,Athens,Greece, 2Oftalvist,Murcia,Spain, 3Laboratorio de Optica,Universidad de Murcia,Murcia,Spain
Purpose
To develop a realistic eye model of the pseudophakic eye and to objectively measure and compare the through-focus performance in a variety of premium IOLs.
Setting
Laboratory testing, Diestia Systems, Athens Greece
Methods
The eye model had a PMMA cornea with a radius of 7.73mm (Q= -0.24, spherical aberration of +0.18microns @ 6mm pupil). The iris was situated at 3.55mm from the anterior surface of the cornea. The IOL was positioned at a distance of 0.5 from the pupil. Images of standardized optotypes were recorded at the retinal plane using a camera in a water-tight casing. The vergence of the stimulus was controlled with a tunable lens (Optotune, Switzerland). Through-focus images of the optotype were recorded for two different pupil diameters (3 and 4.5mm) for a variety of premium IOLs. For each image the Objective Letter Sharpness (OLS) as a quality metrics was calculated. Depth of focus was defined as the range for which OLS was higher than 0.05 (or 5%)
Results
The OLS ranged 0.36 to 0.42 for refractive EDOF / enhanced monofocal (J&J Eyehance, Voptica Art 70, Zeiss Lara) and 0.16 to 0.26 for trifocals (Zeiss Lisa, Alcon Panoptix, Physiol PodF). Depth of focus ranged from 0.9 to 2D for EDOF and 2.5 and 2.7 D for trifocals.
Conclusions
As expected, the peak value of the OLS was obtained for far focus. The broader the depth of focus the lower the peak value, indicating a different design approach. Refractive designs had better far image quality when compared to diffractive. The methodology presented can provide visual reference for the optical behaviour of the various lens types along with objective scores for image sharpness and depth of focus. Planning some myopia (e.g. 0.5D) in EDOF lenses may prove useful in achieving results comparable to multifocals. This information may prove useful for surgeons planning the use of premium IOLs along with patients.