scholarly journals Two-stage procedure in the management of selected cases of keratoconus: clear lens extraction with aspherical IOL implantation followed by WFG-PRK

2018 ◽  
Keyword(s):  
Two Stage ◽  
Iol Implantation ◽  
Lens Extraction ◽  
Aspherical Iol

scholarly journals Comparison of the Techniques of Secondary Intraocular Lens Implantation after Penetrating Keratoplasty

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Katarzyna Krysik ◽  
Dariusz Dobrowolski ◽  
Ewa Wroblewska-Czajka ◽  
Anita Lyssek-Boron ◽  
Edward Wylegala
Keyword(s):  
Surgical Techniques ◽  
Vitreous Body ◽  
Iol Implantation ◽  
Scleral Fixation ◽  
Lens Extraction ◽  
Secondary Iol Implantation ◽  
Secondary Implantation ◽  
Significant Difference ◽  
Corrected Distance Visual Acuity ◽  
Secondary Intraocular Lens Implantation

Aim. To conduct a retrospective analysis of secondary IOL implantation in patients who underwent PK with no simultaneous IOL implantation. Materials and Methods. The retrospective study of the secondary implantation of IOLs was conducted in 46 eyes that underwent a primary operation with PK and cataract/lens extraction with no IOL implantation due to capsule rupture or combining corneal or intraocular complications. The minimum period from PK was 12 months. All secondary IOL implantations were performed from January 2011 to August 2017. Aphakic postkeratoplasty patients were treated using one of the surgical techniques for secondary IOL implantation. In-the-bag IOL implantation was possible if the posterior capsule was complete. If the lens capsule remnants were sufficient to provide secure IOL support, an in-the-sulcus IOL implantation was performed. Scleral fixation was offered in eyes with extensive capsular deficiency or the presence of the vitreous body in anterior chamber. BCVA and expected and achieved refraction were evaluated; we included using two biometry devices, and results were compared. Results. The corrected distance visual acuity (CDVA) before surgery ranged from 0.1 to 0.8 (mean 0.54 ± 0.17). After secondary IOL implantation, CDVA ranged from 0.2 to 0.8 (mean 0.43 ± 0.14) at postoperative 1 month and from 0.3 to 0.9 (mean 0.55 ± 0.15) at postoperative 6 months (p<0.05). Comparison of the final refraction using two methods of biometry showed no statistically significant difference in the group that underwent scleral fixation of the IOL, similar to the findings for the in-the-bag and in-the-sulcus IOL implantation groups. In the scleral-fixation group, p=0.55 for the USG biometry technique and p=0.22 for the OB technique. p values for the IOL-implantation group were p=0.49 and p=0.44, respectively. Conclusion. Both implantation methods are safe for the patients. Final refraction is depending on the technique and indication to keratoplasty. Both biometry techniques deliver precise data for IOL choice.

scholarly journals Tactics of Two-Stage IOL Implantation in Difficult Refractive Cases

2021 ◽  
Vol 18 (3) ◽  
pp. 415-421
Author(s):  
A. A. Kasyanov
Keyword(s):  
High Efficiency ◽  
Rotational Instability ◽  
Observation Group ◽  
Two Stage ◽  
Guaranteed Accuracy ◽  
Iol Implantation ◽  
Multifocal Iol ◽  
Correction Of Astigmatism ◽  
High Degree ◽  
Target Refraction

In a number of complex refractive cases, the achievement of an accurate refractive result cannot be guaranteed. Simultaneous implantation of a toric or multifocal IOL for the correction of complex ametropias may be accompanied by a significant deviation from the target refraction. The tactics of two-stage implantation with the usage of an additional Sulcoflex IOL for the final correction of astigmatism and possible residual spherical ametropia allows achieving emmetropia. In our study, this method was used in 15 patients with difficult refractive cases. Toric, multifocal, and multifocal toric Sulcoflex IOL were used. Implantation of all Sulcoflex modifications was performed through a 2.4 mm temporal incision using wound assisted technology. In cases of high degree hypermetropia, preventive iridectomy was performed using a 23G vitrectome. The target refraction was achieved in the entire observation group. In the postoperative period, no significant level of ophthalmic hypertension was registered. No cases of introlens opacification, iridocyclitis, or rotational instability were registered either.The method of two-stage IOL implantation allows achieving the target refraction in difficult refractive situations with almost guaranteed accuracy. The calculation method provides good predictability of the refractive result. This technology significantly expands the indications for intraocular correction using toric and multifocal IOL, as well as the limits of correction of high degree astigmatism. Our Sulcoflex IOL implantation experience has shown their high efficiency and safety.

Comparative evaluation of the results of simultaneous and two-stage surgical treatment of patients with advanced proliferative diabetic retinopathy and complicated incipient cataract.

2021 ◽  
pp. 38-42
Author(s):  
K.I. Konovalova ◽  
◽  
M.M. Shishkin ◽  
Keyword(s):  
Diabetic Retinopathy ◽  
Comparative Analysis ◽  
Surgical Treatment ◽  
Postoperative Complications ◽  
Comparative Evaluation ◽  
Vitreoretinal Surgery ◽  
Treatment Procedure ◽  
Two Stage ◽  
Iol Implantation ◽  
Gas Tamponade

Aim. Undertake a comparative analysis of the results two-stage or simultaneously vitreoretinal surgery with phacoemulsification of PDR patients. Material and methods. 52 cases of surgery treatment of patients with PDR and complicated primary cataract were analyzed. These patients were divided into three groups. In the 1st group patients were subjected to a two–step surgical procedure: vitreoretinal surgery with gas tamponade performed as the 1st step in their treatment; followed by the 2d step, phacoemulsification surgery and the IOL implantation. In the 2d group phacoemulsification performed simultaneously with vitreoretinal surgery: phacoemulsification, IOL implantation, vitreoretinal surgery with gas tamponade. Results. Outcomes of the preliminary studies suggest that it is more viable to perform phacoemulsification surgery sometime later along on PDR patients with complicated primary cataract. Conclusions. This sequence of treatment procedure ensures a more gentle approach to the anatomic structures of the eye during the first stage (vitreoretinal surgery) and contributes to the reduction in the number of intraoperative and postoperative complications. Key words: diabetic retinopathy, cataract, vitreoretinal surgery.

Phakic IOL implantation versus clear lens extraction in highly myopic eyes

2005 ◽  
Vol 31 (11) ◽  
pp. 2041 ◽  
Author(s):  
Mayank A. Nanavaty ◽  
Abhay R. Vasavada ◽  
Charlotta Zetterström
Keyword(s):  
Iol Implantation ◽  
Phakic Iol ◽  
Lens Extraction

Two-stage self-seeding method for preparation of single crystals of poly(phenylene sulfide)

1989 ◽  
Vol 47 ◽  
pp. 368-369
Author(s):  
Sengshiu Chung ◽  
Peggy Cebe
Keyword(s):  
Single Crystals ◽  
High Performance ◽  
Dilute Solution ◽  
Two Stage ◽  
Annealing Behavior ◽  
High Performance Polymers ◽  
Seeding Method ◽  
Phenylene Sulfide

We are studying the crystallization and annealing behavior of high performance polymers, like poly(p-pheny1ene sulfide) PPS, and poly-(etheretherketone), PEEK. Our purpose is to determine whether PPS, which is similar in many ways to PEEK, undergoes reorganization during annealing. In an effort to address the issue of reorganization, we are studying solution grown single crystals of PPS as model materials.Observation of solution grown PPS crystals has been reported. Even from dilute solution, embrionic spherulites and aggregates were formed. We observe that these morphologies result when solutions containing uncrystallized polymer are cooled. To obtain samples of uniform single crystals, we have used two-stage self seeding and solution replacement techniques.

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