Multifocal Intraocular Lenses: AT LISA 809 Diffractive Bifocal Intraocular Lens

2019 ◽  
pp. 207-212
Author(s):  
Ana B. Plaza-Puche ◽  
Jorge L. Alió
Keyword(s):  
Intraocular Lens ◽  
Intraocular Lenses ◽  
Multifocal Intraocular Lenses ◽  
Bifocal Intraocular Lens

scholarly journals Method to quantify the decentration of the multifocal intraocular lenses in relation to the visual axis

2018 ◽  
Vol 17 (4) ◽  
pp. 117-119
Author(s):  
Fernando Eduardo Polit
Keyword(s):  
Intraocular Lens ◽  
Qualitative Method ◽  
Visual Quality ◽  
Intraocular Lenses ◽  
Slit Lamp ◽  
Visual Axis ◽  
Light Reflex ◽  
Multifocal Intraocular Lenses ◽  
Real Value ◽  
Slit Lamp Biomicroscopy

Since position and centration have shown to affect the effectiveness of multifocal intraocular lenses (MFIOLs), some authors have proposed using the "coaxially sighted IOL light reflex" as a landmark to allow consistent centration of MFIOLs. Postoperatively, assessing the location of the intraocular lens with respect to the visual axis is also important. Centration of the MFIOLs can be identified postoperatively by slit lamp biomicroscopy, but it is still a qualitative method. The Nidek OPD Scan III is used. The instrument obtains retro illumination images, which allows the observation of the diffractive rings of the multifocal intraocular lenses implanted following phacoemulsification. The retro illumination image describes the location of the visual axis (white cross with blue borders +), the center of the photopic (pink cross) and mesopic (turquoise cross) pupil, quantifies the distance between the center of the pupil and the visual axis, and places the visual axis in degrees. It is attempted to match the rings of the lens with that of the acetate grid. Once the best possible equidistance between the lens and grid rings has been achieved. This method can be useful to be able to have reference of a real value of decentration of the lenses and thus have a surgical plan and try to center the lenses. We are also creating a technique to properly center the lenses, in addition to performing an analysis of the results in terms of postoperative visual quality in relation to the lens's decentration and thus see how this really affects.

scholarly journals Analyzing the reasons for patients’ dissatisfaction with the results of multifocal intraocular lens implantation

2014 ◽  
Vol 95 (4) ◽  
pp. 515-519
Author(s):  
K S Ivonin
Keyword(s):  
Visual Acuity ◽  
Contrast Sensitivity ◽  
Intraocular Lens ◽  
Intraocular Lenses ◽  
Intraocular Lens Implantation ◽  
Multifocal Intraocular Lens ◽  
Multifocal Intraocular Lenses ◽  
Spatial Contrast Sensitivity ◽  
Lens Implantation ◽  
Light Side

Aim. To analyze the causes for patients’ dissatisfaction with the results of multifocal intraocular lens implantation. Methods. The research is based on the results of cataract surgeries in 220 patients (50 patients were implanted multifocal refractive intraocular «M-flex» lens, 40 - multifocal intraocular «Gradiol» lens, 64 - multifocal intraocular «Accord» lens, 66 - monofocal intraocular lens). Pre-and post-operative examination included visual acuity test (with and without correction to near, far and moderate distances), determination of the nearest point of clear vision, contrast sensitivity study using the «Zebra» software, stereo vision test, pupil diameter measuring, refractometry, keratometry, binocular vision color tests, patient questioning. Pre-operative evaluation was performed 1 day prior to surgery. Post-operative observation was carried out 1 week, 1, 3, 6 and 12 months after the surgery. Results. No statistically significant difference (p 0.05) in uncorrected visual acuity at different light intensity - 102 lux and 416 lux - was found between the groups with different types of multifocal intraocular lenses. In groups with multifocal intraocular lenses light side effects were observed in 46-52.5% of patients. However, there was no link between the light side effects and patients’ satisfaction with results of the surgery. Reduction of spatial contrast sensitivity parameters was registered in all groups of multifocal intraocular lenses patients compared to patients with monofocal intraocular lenses (p 0.05). According to the survey results, 92.5 to 94% of patients with multifocal intraocular lenses did not report decreased visual acuity on moderate distance. Conclusion. The most important reason for patients’ dissatisfaction with the results of the multifocal intraocular lenses implanting was the reduction of spatial-contrast sensitivity parameters. Bilateral multifocal intraocular lenses implanting improved the contrast ratio.

scholarly journals Comparison of visual and optical quality of monofocal versus multifocal intraocular lenses

2019 ◽  
Vol 30 (2) ◽  
pp. 299-306 ◽  
Author(s):  
Irene Altemir-Gomez ◽  
Maria S Millan ◽  
Fidel Vega ◽  
Francisco Bartol-Puyal ◽  
Galadriel Gimenez-Calvo ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Transfer Function ◽  
Contrast Sensitivity ◽  
Intraocular Lens ◽  
Modulation Transfer Function ◽  
Area Under The Curve ◽  
Optical Quality ◽  
Intraocular Lenses ◽  
Modulation Transfer ◽  
Multifocal Intraocular Lenses

Objective: To compare visual quality in patients implanted with Tecnis® monofocal (ZCB00) and multifocal (ZMB00) intraocular lenses taking into account their optical quality measured in vitro with an eye model. Methods: In total, 122 patients participated in this study: 44 implanted with monofocal and 78 with multifocal intraocular lenses. Measurements of visual acuity and contrast sensitivity were performed. The optical quality of the intraocular lenses was evaluated in three image planes (distance, intermediate and near) using an eye model on a test bench. The metric considered was the area under the curve of the modulation transfer function. Results: Optical quality at the far focus of the monofocal intraocular lens (area under the curve of the modulation transfer function = 66.97) was considerably better than that with the multifocal lens (area under the curve of the modulation transfer function = 32.54). However, no significant differences were observed between groups at the distance-corrected visual acuity. Distance-corrected near vision was better in the multifocal (0.15 ± 0.20 logMAR) than that in the monofocal group (0.43 ± 0.21 logMAR, p < 0.001), which correlated with the better optical quality at near reached by the multifocal intraocular lens (area under the curve of the modulation transfer function = 29.11) in comparison with the monofocal intraocular lens (area under the curve of the modulation transfer function = 5.0). In intermediate vision, visual acuity was 0.28 ± 0.16 logMAR (multifocal) and 0.36 ± 0.14 logMAR (monofocal) with p = 0.014, also in good agreement with the values measured in the optical quality (area under the curve of the modulation transfer function = 10.69 (multifocal) and 8.86 (monofocal)). The contrast sensitivity was similar in almost all frequencies. Pelli–Robson was slightly better in the monofocal (1.73) than in the multifocal group (1.64; p = 0.023). Conclusion: Patients implanted with multifocal ZMB00 achieved a distance visual acuity similar to those implanted with monofocal ZCB00, but showed significantly better intermediate and near visual acuity. A correlation was found between intraocular lenses’ optical quality and patients’ visual acuity. Contrast sensitivity was very similar between the multifocal and monofocal groups.

scholarly journals Visual Performance after Bilateral Implantation of a Four-Haptic Diffractive Toric Multifocal Intraocular Lens in High Myopes

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
John S. M. Chang ◽  
Vincent K. C. Chan ◽  
Jack C. M. Ng ◽  
Antony K. P. Law
Keyword(s):  
Contrast Sensitivity ◽  
Intraocular Lens ◽  
Case Series ◽  
Intraocular Lenses ◽  
Visual Performance ◽  
Multifocal Intraocular Lens ◽  
Multifocal Intraocular Lenses ◽  
Spatial Frequencies ◽  
High Satisfaction ◽  
Line Loss

Background. The vision with diffractive toric multifocal intraocular lenses after cataract surgery in long eyes has not been studied previously.Objectives. To report visual performance after bilateral implantation of a diffractive toric multifocal intraocular lens in high myopes.Methods. Prospective, observational case series to include patients with axial length of ≥26 mm and corneal astigmatism of >1 dioptre who underwent bilateral AT LISA 909M implantation. Postoperative examinations included photopic and mesopic distance, intermediate, and near visual acuity; photopic contrast sensitivity; visual symptoms (0–5); satisfaction (1–5); and spectacle independence rate.Results. Twenty-eight eyes (14 patients) were included. Postoperatively, mean photopic monocular uncorrected distance, intermediate, and near visual acuities (logMAR) were0.12±0.20(standard deviation),0.24±0.16, and0.29±0.21, respectively. Corresponding binocular values were-0.01±0.14,0.13±0.12, and0.20±0.19, respectively. One eye (4%) had one-line loss in vision. Under mesopic condition, intermediate vision and near vision decreased significantly (allP≤0.001). Contrast sensitivity at all spatial frequencies did not improve significantly under binocular condition (allP>0.05). Median scores for halos, night glare, starbursts, and satisfaction were 0.50, 0.00, 0.00, and 4.25, respectively. Ten patients (71%) reported complete spectacle independence.Conclusions. Bilateral implantation of the intraocular lens in high myopes appeared to be safe and achieved good visual performance and high satisfaction.

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