Bifocal and Multifocal Contact Lenses for Presbyopia and Myopia Control

Figure 3

Illustration of the phase pattern and through-focus theoretical simulations of the Snellen E-letter of 30 arc-min for 4 mm pupil diameter (from −1.5 to +1.5). Top: diffraction-limited eye; bottom: aspheric-based design (spherical aberration: +0.25 μm).