Contrast sensitivity and depth of focus with aspheric multifocal versus conventional monofocal intraocular lens

Visual and refractive status at different focal distances after implantation of the ReSTOR multifocal intraocular lens

“…However, as with other studies, 2,4,6 postoperative glare symptoms were the most common problem, occurring primarily in patients with refractive lens exchange. Although improved depth of focus with the multifocal IOL compared with monofocal IOLs is consistently reported, 10,12,13,19,20 a drop in visual acuity at the intermediate range is shown by depth of focus curves of multifocal IOLs 9-13 and by visual acuity measurement at all distances. 14 There was a significant variation in vision between 33 cm and 50 cm, with the poorest vision in the 50 to 70 cm range.…”

Visual acuity from far to near and contrast sensitivity in eyes with a diffractive multifocal intraocular lens with a low addition power

“…We used the CAT-2000 for contrast sensitivity testing because with and without glare, it is more sensitive than other contrast sensitivity testing devices. 11,12 Many studies [13][14][15][16][17][18][19][20][21] report that contrast sensitivity is impaired with most multifocal IOLs, especially diffractive IOLs. However, because the multifocal IOL we used has an aspheric optic and a low add power, contrast sensitivity with and without glare under photopic and mesopic conditions was markedly better than with the C4.0 D IOLs we tested in the clinical trial.…”

“…Second, contrast sensitivity tends to be impaired and glare disability greater, in particular with diffractive multifocal IOLs. [13][14][15][16][17][18][19][20][21] Third, halo and glare symptoms are more severe with multifocal IOLs, specifically refractive models. [30][31][32][33] The current study showed that the aspheric diffractive multifocal IOL with low add power improved intermediate visual acuity significantly and provided contrast visual acuity with and without glare similar to that with monofocal IOLs.…”

Visual performance and biocompatibility of 2 multifocal diffractive IOLs

“…1 Multifocal IOLs have proved to be effective in ensuring distance and near visual performance because they produce a variable number of foci, either finite or infinite, depending on the lens design. [2][3][4] However, the light dispersion due to refractive or diffractive optics leads to undesirable symptoms such as glare, halos, and reduction of contrast sensitivity. [5][6][7] Moreover, the spherical design of the commercially available MIOLs leads to an increase in the overall spherical aberration of the eye due to a disruption of the cornea-lens balance.…”