scholarly journals Study of State of Interface “Intraocular Lens — Posterior Capsule” Depending on Size of Capsulorhexis in Senile Cataract Phacoemulsification

2021 ◽  
Vol 18 (3) ◽  
pp. 427-432
Author(s):  
Lina Bai ◽  
O. V. Kolenko ◽  
A. V. Egorova ◽  
A. V. Vasiliev
Keyword(s):  
Optical Coherence Tomography ◽  
Femtosecond Laser ◽  
Intraocular Lens ◽  
Senile Cataract ◽  
Posterior Capsule ◽  
Average Depth ◽  
Maximum Value ◽  
Full Contact ◽  
Corneal Opacities ◽  
Capsular Bag

Purpose. To study the state of interface “intraocular lens (IOL) — posterior capsule (PC)” depending on diameter of capsulorhexis in phacoemulsification of senile cataract.Patients and methods. 227 patients (227 eyes) were examined after phacoemulsification of senile cataract at LenSx femtosecond laser (Alcon, USA). The study did not include patients with corneal opacities, signs of axial displacement of lens, with irido- and phacodonesis, glaucoma, axial length less than 22 mm and more than 26 mm. Depending on diameter of performed capsulorhexis, we formed 3 groups: 1st group — 76 eyes with diameter capsulorexis 5.5 mm; 2nd group — 73 eyes with 5.0 mm; 3rd group — 78 eyes with 4.5 mm. We studied type of interface “IOL — PC”, the maximum value of PC diastasis and the maximum depth of its folds using an RTVue-100 Optical Coherence Tomography (Optovue, USA) on the first day after the operation.Results. The maximum number of eyes with absence of contact between IOL and PC was noted in the 3rd group (62.8 %), the largest number of eyes with full contact between IOL and PC (63.2 %) was in the 1st group. The minimum average depth of the PC folds (111.1 ± 32.7 μm) was noted in the 1st group, and the maximum (165 ± 75.4 μm) — in the 2nd group.Conclusion. The analysis showed that type of interface “IOL — PC” in the first day after phacoemulsification of senile cataract depends on diameter of capsulorhexis. The largest number of eyes (64.6 %) with full contact between IOL and PC was observed in the group of patients with capsulorhexis 5.5 mm, and the smallest (6.4 %) — in eyes with diameter capsulorexis 4.5 mm. Presumably, the main reason for the absence or incomplete contact between IOL and PC is the presence of viscous dispersive between them. The deformation of PC in the form of folds does not directly depend on diameter of capsulorhexis and, obviously, is due to the uneven tension of the capsular bag by the IOL haptics.

Study of peculiarities of intra- and postoperative state of the interface «intraocular lens - posterior capsule» in phacoemulsification of senile cataract

2021 ◽  
pp. 13-16
Author(s):  
L. Bai ◽  
◽  
A.V. Vasiliev ◽  
A.V. Egorova ◽  
◽  
...  
Keyword(s):  
Intraocular Lens ◽  
Anterior Segment ◽  
Early Period ◽  
Central Zone ◽  
Senile Cataract ◽  
Posterior Capsule ◽  
Dynamic Observation ◽  
Full Contact ◽  
Postoperative State ◽  
Capsular Bag

Presence of full contact of interface «intraocular lens (IOL) – posterior capsule (PC)» ensures the transparency of the latter in the early period after phacoemulsification (PE) of senile cataract (SC). The main reasons for absence of full contact of IOL with PC are: the presence of residuals of viscoelastic (VE) in the capsular bag, uneven tension of the capsule by the haptic elements of the IOL, and the incommensurability of the size of the IOL with the capsule. Purpose. To study the features of the intra- and postoperative state of interface «IOL – PC» during PE SC. Material and methods. Dynamic observation of 42 patients (42 eyes), who operated on immature senile cataracts, was carried out. All operations were performed using OPMI LUMERA 700 surgical microscope (Carl Zeiss Meditec AG, Jena, Germany) with integrated intra-operative OCT, state of interface «IOL – PC» was examined. 2 hours after and on the 1st day after the operation state of interface «IOL – PC» was studied in all eyes by OCT on Optovue RTVue-100 (Optovue, Inc., US) with module for anterior segment examining to protocols «Cornea Line» and «Cornea Cross Line». Results. During the operation, the presence of contact between IOL and PC was observed only in 9 eyes (21.4%). 2 hours after surgery, 40 eyes (95.2%) had absence of contact between lens and capsule. On the 1st day after surgery, the optimal interface between IOL and PC was observed in 32 eyes (76.2%). Conclusion. Studies have shown that state of interface «IOL – PC» on the 1st day does not depend on its characteristics revealed intraoperative and 2 hours after the operation. The main reason for absence of contact between IOL and PC is residues of VE, and the using «impulse-irrigation» technique allows completely removing VE from the central zone of the capsule in all cases. Key words: cataract, phacoemulsification, intraocular lens, lens capsule, viscoelastic, interface «IOL – PC».

scholarly journals Anatomical and Topographical Relations between the Posterior Lens Capsule and the Intraocular Lens in Pseudoexfoliation Syndrome

2018 ◽  
Vol 15 (2S) ◽  
pp. 134-139
Author(s):  
E. V. Egorova
Keyword(s):  
Optical Coherence Tomography ◽  
Quantitative Analysis ◽  
Intraocular Lens ◽  
Postoperative Period ◽  
Anterior Segment ◽  
Posterior Capsule ◽  
Pseudoexfoliation Syndrome ◽  
Full Contact ◽  
High Resolution Oct ◽  
Late Postoperative Period

Purpose— to study the relations between the posterior capsule (PC) and intraocular lens (IOL) after cataract surgery in pseudoexfoliation syndrome (PEX).Patients and methods. We examined 46 eyes of 37 patients with PEX who underwent a standard and uncomplicated phacoemulsification. The age of patients was 60–94 years. Postoperative period ranged from 1 day to 10 years. An optical coherence tomography (OCT) (RTVue XR Avanti, “Optovue”) was used to image the IOL-PC space in early and late postoperative period.Results. In the first days full contact PC-IOL was not observed in any case. The maximum of space PC-IOL was noted on the first day postoperatively. Posterior capsule had a wavy or folded profile on the scans. In the next two weeks we observed a decrease of the distances between posterior capsule and IOL. After 1 month we noted the formation of capsular bend around optic edge, the full adhesion of posterior capsule to IOL was not detected. In the late postoperative period the fibroplastic and proliferative capsular changes with secondary discontact PC-IOL was noted. Primary inadhesion of a posterior capsule to IOL was recorded in half of the cases.и. High resolution OCT was suitable for quantitative analysis of IOL-PC space. Involution changes in structures of anterior segment in the eyes with PEX had a role in closure of the IOL-PC space. Complete adhesion of posterior capsule to IOL was not observed in the majority of eyes with PEX. 

Intraocular lens–capsular bag imaging with ultrahigh-resolution optical coherence tomography

2005 ◽  
Vol 31 (4) ◽  
pp. 818-823 ◽  
Author(s):  
Reijo J. Linnola ◽  
Oliver Findl ◽  
Boris Hermann ◽  
Harald Sattmann ◽  
Angelika Unterhuber ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Intraocular Lens ◽  
Optical Coherence ◽  
Ultrahigh Resolution ◽  
Capsular Bag

scholarly journals The Predictability of Preoperative Pilocarpine-Induced Lens Shift on the Outcomes of Accommodating Intraocular Lenses Implanted in Senile Cataract Patients

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Jin Li ◽  
Qi Chen ◽  
Zhibo Lin ◽  
Lin Leng ◽  
Fang Huang ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Intraocular Lens ◽  
Anterior Segment ◽  
Senile Cataract ◽  
Intraocular Lenses ◽  
Iol Implantation ◽  
Accommodation Stimulus ◽  
The Mean ◽  
Preoperative Parameter ◽  
Cataract Patients

Purpose. To evaluate the predictability of lens shift induced by pilocarpine (LSPilo) on the outcomes of accommodating intraocular lens (Acc-IOL) implantation.Methods. Twenty-four eyes of 24 senile cataract patients who underwent phacoemulsification and Acc-IOL implantation were enrolled.LSPilowas evaluated with anterior segment optical coherence tomography (AS-OCT). At 3 months postoperatively, the best corrected distance visual acuities (BCDVA), distance-corrected near visual acuities (DCNVA), and subjective and objective accommodations were measured. IOL shifts under accommodation stimulus (IOLSAcc) were evaluated with AS-OCT.Results. The meanLSPilowas 112.29 ± 30.72 µm.LSPilowas not associated with any preoperative parameters. The meanIOLSAccwas 130.46 ± 42.71 µm. The mean subjective and objective accommodation were 1.54 ± 0.39 D and 1.27 ± 0.41 D, respectively. The mean postoperative BCDVA and DCNVA (log MAR value) were 0.22 ± 0.11 and 0.24 ± 0.12, respectively.LSPilopositively correlated withIOLSAcc(r=0.541;P=0.006), subjective accommodation (r=0.412;P=0.022), and objective accommodation (r=0.466;P=0.045), respectively.Conclusion.LSPilois an independent preoperative parameter associated with the postoperative Acc-IOL mobility and pseudophakic accommodation. It may offer valuable information for ophthalmologists in determining the suitable candidates for Acc-IOL implantation.

Posterior capsule opacification and capsular bag performance of a microincision intraocular lens

2011 ◽  
Vol 37 (11) ◽  
pp. 1988-1992 ◽  
Author(s):  
Vinod Gangwani ◽  
Nino Hirnschall ◽  
John Koshy ◽  
Alja Crnej ◽  
Yutaro Nishi ◽  
...  
Keyword(s):  
Intraocular Lens ◽  
Posterior Capsule Opacification ◽  
Posterior Capsule ◽  
Microincision Intraocular Lens ◽  
Capsular Bag

scholarly journals Behavior of Generated Gas during Femtosecond Laser Lens Irradiation in Porcine Cadaver Eyes

2021 ◽  
Vol 11 (17) ◽  
pp. 8247
Author(s):  
Yoichiro Masuda ◽  
Kotaro Oki ◽  
Akira Watanabe ◽  
Makiko Ohkido ◽  
Hisaharu Iwaki ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Anterior Chamber Depth ◽  
Lens Capsule ◽  
Posterior Capsule ◽  
Irradiation Site ◽  
Irradiation Energy ◽  
Before And After ◽  
Capsular Block Syndrome

(1) Background: We investigated the behavior of gas inside a lens and its influence on the lens capsule, which may cause complications by lens irradiation with a femtosecond laser cataract surgery device. (2) Methods: The crystalline lenses of 6-month-old porcine cadaver eyes were observed during laser irradiation. An intraocular endoscope in the vitreous cavity was used to measure the posterior capsule position. Optical coherence tomography measurements of the anterior chamber depth before and after the laser irradiation, as well as measurements of the equatorial perimeter of the extracted lens, were compared with those of the controls. (3) Results: Femtosecond laser-generated gas in the porcine lens was dependent on laser irradiation energy. Increases in the amount of laser irradiation energy caused the generated gas to coalesce, move backwards beyond the laser irradiation site, and expand the lens capsule and posterior capsule. (4) Conclusions: The present results suggest that laser irradiation-induced gas moves in the direction of the posterior capsule beyond the lens irradiation site and expands the lens capsule, which may be involved in the development of capsular block syndrome.

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