Vector Analysis, Rotational Stability, and Visual Outcome After Implantation of a New Aspheric Toric IOL

Bachernegg, Alexander; Rückl, Theresa; Strohmaier, Clemens; Jell, Gerlinde; Grabner, Günther; Dexl, Alois K.

doi:10.3928/1081597x-20150727-01

Cited by 16 publications

(20 citation statements)

References 23 publications

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“…On the basis of the keratometric data, the predictability of the new combined procedure was evaluated. Alpin's method was used in the present study, as the method is able to comprehensively analyze the changes of astigmatism (17). In the present study, the SIA was closely correlated with the TIA.…”

Section: Post-mentioning

confidence: 59%

“…Vector analysis. Keratometric astigmatism vectors were evaluated using the Alpins method, which assesses the effective change in keratometric astigmatism (17). Vector parameters analyzed included: The target induced astigmatism (TIA), defined as the astigmatic correction in magnitude and axis the operator intended to induce, which is equivalent to the pre-operative astigmatism; surgically induced astigmatism (SIA), defined as the amount and axis of astigmatic change actually induced by surgery; difference vector (DV), defined as the vector difference of TIA and SIA and reflecting the post-operative astigmatism; angle of error (AE), which is the angle offset between SIA and TIA-it is positive if SIA is on an axis counterclockwise to TIA and negative if SIA is on an axis clockwise to TIA; magnitude of the error (ME), which is the magnitude difference between SIA and TIA-it is positive for overcorrection and negative for undercorrection; correction index, calculated by dividing the SIA by the TIA-it is ideally 1.0, and >1.0 for overcorrection and <1.0 for undercorrection; index of success (IOS), calculated by dividing the DV by the TIA-it is ideally 0.…”

Section: Methodsmentioning

confidence: 99%

“…The present study was approved by the Ethics Committee of the First Affiliated Hospital of Anhui Medical University (reference no. Quick-PJ 2013- [11][12][13][14][15][16][17]. Informed consent was obtained from all participants.…”

Section: Fundingmentioning

confidence: 99%

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Effects of astigmatic keratotomy combined with scleral tunnel incisions for the treatment of high astigmatism after penetrating keratoplasty

et al. 2018

Exp Ther Med

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The present study aimed to evaluate the efficacy, predictability and safety of astigmatic keratotomy (AK) combined with scleral tunnel incisions in the treatment of high astigmatism after penetrating keratoplasty (PKP). Paired AK combined with scleral tunnel incisions was performed at the steep astigmatic meridian in 8 eyes of 8 patients with high keratometric astigmatism [>5.0 diopters (D)] after PKP. Pre-and post-operative parameters, including uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), refraction and keratometric astigmatism were evaluated. The Alpins method for vector analysis was used to evaluate the changes in keratometric astigmatism. The results indicated a statistically significant reduction in the mean keratometric astigmatism from 8.16±3.02 D pre-operatively to 2.28±1.07 D at 3 months postoperatively. The mean UCVA improved from 0.95±0.24 logarithm of the minimum angle of resolution (logMAR) pre-operatively to 0.61±0.17 logMAR at 3 months postoperatively (P<0.05). The mean BCVA improved from 0.41±0.18 logMAR pre-operatively to 0.26±0.12 logMAR at 3 months postoperatively (P>0.05). Between 3 and 6 months after the surgery, the keratometric astigmatism remained stable. Alpins vector analysis demonstrated the relative predictability of this combined surgical treatment. The surgically induced astigmatism was significantly correlated with the target induced astigmatism (r= 0.76, P<0.05). None of the patients had any severe complications. The present study indicated that AK combined with scleral tunnel incisions is an effective, relatively predictable and safe treatment for high astigmatism after PKP.

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Section: Post-mentioning

confidence: 59%

Section: Methodsmentioning

confidence: 99%

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Effects of astigmatic keratotomy combined with scleral tunnel incisions for the treatment of high astigmatism after penetrating keratoplasty

et al. 2018

Exp Ther Med

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“…It is estimated that 25% to 40% of cataract patients have astigmatism more than 1.0 diopters (D) [1,2]. With the increasing demands for good refractive outcomes after cataract surgery, toric intraocular lenses (IOLs) have been widely used to correct preoperative corneal astigmatism during surgery.…”

Section: Introductionmentioning

confidence: 99%

Comparison of two techniques for toric intraocular lens implantation: hydroimplantation versus ophthalmic viscosurgical devices

Chen¹

2018

http://isrctn.com/

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Background: To compare the results between hydroimplantation of a single-piece, acrylic foldable toric intraocular lens (IOLs) and conventional implantation using an ophthalmic viscosurgical device (OVD). Methods: In this study, 60 eyes with cataract and preexisting regular corneal astigmatism of 1.0 to 3.0 diopters (D) underwent the implantation of the AcrySof toric IOLs (Alcon Laboratories, Inc.). The patients were randomly assigned to a conventional implantation technique with an OVD or a hydroimplantation technique. Comparison of preoperative and postoperative parameters was performed using paired Student t tests, and independent Student t test was used to compare between the two groups. Results: Three months postoperatively, the mean subjective astigmatism was 0.45 D ± 0.24 (SD) in the OVD group and 0.49 ± 0.29 D in the hydroimplantation group (P = 0.492). The mean endothelial cell density (ECD) loss was 7.54% ± 0. 82% and 7.32% ± 0.59%, respectively (P = 0.117). The mean absolute IOL rotation was 4.77 ± 2.32 degrees and 4.70 ± 1. 95 degrees, respectively (P = 0.334). The mean time for IOL implantation was 71.50 ± 8.10 s and 37.60 ± 3.90 s, respectively (P < 0.001). Two hours, 1 day, 1 week, 1 month, and 3 months postoperatively, there was no significant difference in IOP between the two groups (P > 0.05), although IOP two hours postoperatively seemed to be a little higher in the OVD group. Conclusions: Compared with the use of OVDs for toric IOLs implantation, the hydroimplantation technique provided advantages of increased efficiency, reduced surgical time and cost, and no concerns of OVD-induced elevated IOP.

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“…6 Several studies have reported successful visual and refractive outcomes after implantation of different model soft toric IOL. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] The purpose of the current study is to report our clinical and visual outcomes at 1 month after uncomplicated cataract surgery with toric IOL implantation (SupraPhob).…”

mentioning

confidence: 99%

Study on Visual Outcome Following Toric Iol Implantation in Cataract Patients With Astigmatism

M¹,

P²,

Vanitha³

et al. 2017

jebmh

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BACKGROUND The aim of this study was to determine the efficacy of toric IOL placement in astigmatic patients with immature cataract. MATERIALS AND METHODS This prospective study included 20 eyes of 20 patients with a visually significant cataract and corneal astigmatism ≥1.00 D. All patients underwent phacoemulsification and implantation of SP TORIC IOL. The unaided visual acuity and best corrected visual acuity were evaluated. Toric IOL axis and alignment was measured with slit lamp examination. The IOL manufacturer's webbased toric calculator was used to determine the required cylinder power and axis for the IOL that was going to be implanted. RESULTS Post-operative examination was conducted at day 1, day 3, after 1st week, and 1 month later. The average cylinder in IOL plane is 3.04D±0.66SD. and average cylinder in corneal plane is 2.14D±0.38. The average pre op LOG MAR was 0.8±0.2SD. One month postoperatively, the average Log MAR is 0.2±0.21SD. And the difference LOG MAR is 0.61±0.31SD. Inference: A significant improvement was noted after surgery in Log MAR values. Among 20 patients, 18 (90%) patients had improved visual acuity, 2 (10%) patients didn't show any visual improvement due to misalignment of IOL axis. There were no significant intraoperative complications among the study population. CONCLUSION Implantation of SPTORIC IOL is an effective and safe method to correct corneal astigmatism during cataract surgery.

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Vector Analysis, Rotational Stability, and Visual Outcome After Implantation of a New Aspheric Toric IOL

Abstract: Implantation of the new Bi-Flex T IOL was a safe, stable, and effective method to correct preexisting regular corneal astigmatism during cataract surgery.

Cited by 16 publications

References 23 publications

Effects of astigmatic keratotomy combined with scleral tunnel incisions for the treatment of high astigmatism after penetrating keratoplasty

Effects of astigmatic keratotomy combined with scleral tunnel incisions for the treatment of high astigmatism after penetrating keratoplasty

Comparison of two techniques for toric intraocular lens implantation: hydroimplantation versus ophthalmic viscosurgical devices

Study on Visual Outcome Following Toric Iol Implantation in Cataract Patients With Astigmatism

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