Related Experiment Video
Updated: Jul 19, 2026

Scanning Light Scattering Profiler (SLPS) Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses
Published on: June 6, 2017
Depth of focus in eyes with diffractive bifocal and refractive multifocal intraocular lenses
Gerald Schmidinger1, Wolfgang Geitzenauer, Bernhard Hahsle
1Department of Ophthalmology, Medical University of Vienna, Vienna, Austria. gerald.schmidinger@meduniwien.ac.at
Purpose:
To evaluate monocular and binocular depth of focus in eyes with different multifocal intraocular lens (IOLs) systems.
Setting:
Department of Ophthalmology, Medical University of Vienna, Vienna, Austria.
Methods:
In this comparative interventional study, binocular implantation of multifocal IOLs was performed in 3 groups. In the first group, 26 eyes of 13 patients received asymmetric Acri. Twin (Acri.Tec) IOLs, a near-weighted 733D in 1 eye and a distance-weighted 737D in the fellow eye. In the second group, 26 eyes of 13 patients received a diffractive 811E IOL (Pharmacia). In the third group, 26 eyes of 13 patients received a refractive Array IOL (AMO). The visual acuity was tested monocularly and binocularly starting at 6 m in 0.50 diopter (D) defocusing steps.
Results:
Distance visual acuity was best in eyes with the distance-dominated 737D IOL; eyes with the other IOLs had comparable results. Binocular distance visual acuity was comparable between the Acri. Twin group and the 811E group. The Acri. Twin group had better distance visual acuity than the Array group (P< or =.048). Near visual acuity was best in eyes with the near-weighted 733D, followed by the 737D and the 811E. Patients with Array IOLs had worse visual acuities at reading distance (between 33 cm and 40 cm) (P< or =.001). Patients with diffractive bifocal IOLs had better results than patients with refractive multifocal IOLs at reading distance (P< or =.018).
Conclusion:
The diffractive IOLs performed better than refractive IOLs. Asymmetric-weighted IOLs provided better binocular depth of field.
Related Concept Videos
Focusing of Light in the Eye
Depth Perception and Spatial Vision
Phase Contrast and Differential Interference Contrast Microscopy
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Imaging Biological Samples with Optical Microscopy
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
Confocal Fluorescence Microscopy
