Objective and subjective visual quality after implantation of all optic zone diffractive multifocal intraocular lenses: a prospective, case-control observational study

Abstract

NCT02234635, post-results.

Comparison of Visual Performance between Refractive and Diffractive Multifocal Intraocular Lenses

“…Therefore, we believe this subjective measurement can been used to evaluate the MIOLs in our study and the results is reliable. Besides, the OQAS results of the diffractive MIOL in this study is very close to the results we gained in a previous report [5] , which also indicates that the data is reliable.…”

“…And there results are also consistent with previous reports. [2,4,5,8,17] . However, better results were found in UIVA and DCIVA for the refractive group.…”

“…All MIOLs developed until now with reported clinical outcomes are based on the principles of diffraction and refraction. With these technologies, incoming light rays are distributed onto near and distance focal points or onto several focal points, to provide patients good vision at all distance after cataract surgeries [1][2][3][4][5][6][7] . {Alio, 2012 #93}Meanwhile, these designs produce several consequences such as loss of light which may cause the reduction of contrast sensitivity, permanent overlapping images generating halos and glare and loss of image quality [8][9][10][11] .…”

Refractive errors

“…Refractive compensation for near and distant vision can be achieved with two separate pairs of glasses for far and near; with bifocal glasses (with two different refractive powers: far and near); occasionally with trifocal glasses (with three refractive powers/ zones: far, intermediate, and near); or with varifocal glasses (featuring progressive alteration of refractive power from far to near). Recently contact lenses and intraocular lenses with various refractive power zones have been introduced; however, it seems these lenses may show reduced image quality at relatively large pupillary diameters at dawn, twilight, or during the night (33)(34)(35). Correction by means of so-called monovision (one eye corrected for distance, the other for near vision) is also possible, but at the cost of restricted stereopsis (36).…”

Cognitive functions in patieCognitive functions in patients after cataract phacoemulsification and implantation of multifocal and monofocal intraocular lnts after cataract phacoemulsification and implantation of multifocal and monofocal intraocular lenses

“…At the same time, however, a sharp image overlaps another, blurred image, resulting in decreased sensitivity to contrast and in retinal sensitivity to light in the perimetry [7]. Light diffusion associated with the construction of multifocal lenses is responsible for the appearance of halo and glare, and patients may experience blurry vision or alterations in vision acuity [8][9][10][11][12]. These complaints decrease for most patients with time from lens implantation, which is associated with the gradual adaptation of the visual cortex to new visual conditions called 'neuroadaptation' [7,[13][14].…”