Vector analysis of astigmatism correction after toric intraocular lens implantation

Krall, Eva Maria; Arlt, Eva Maria; Hohensinn, Melchior; Moussa, Sarah; Jell, Gerlinde; Alió, Jorge L.; Plaza-Puche, Ana B.; Bascarán, Lucía; Mendicute, Javier; Grabner, Günther; Dexl, Alois K.

doi:10.1016/j.jcrs.2014.07.038

Cited by 30 publications

(19 citation statements)

References 20 publications

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“…These visual and refractive outcomes are consistent with recent studies of other toric IOLs. [5][6][7]14 Rotational stability is paramount in a toric IOL. Even minor degrees of misalignment can cause significant loss of cylinder correction efficacy with subsequent residual refractive errors and visual acuity deterioration.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Clinical Outcomes After Cataract Surgery With a New Transitional Toric Intraocular Lens

Ferreira¹,

Berendschot²,

Ribeiro³

2016

J Refract Surg

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Section: Discussionmentioning

confidence: 99%

“…These rotational stability results are similar to those reported in other recent toric IOL studies. [5][6][7]14 IOL rotation is mainly caused by haptic compression resulting from capsular contraction. The Precizon Toric IOL was designed with offset-shaped haptics to prevent postoperative rotation and posterior capsule opacification.…”

Section: Discussionmentioning

confidence: 99%

Clinical Outcomes After Cataract Surgery With a New Transitional Toric Intraocular Lens

Ferreira¹,

Berendschot²,

Ribeiro³

2016

J Refract Surg

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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).…”

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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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We read with interest the paper by Krall et al 1 We found that the methods they followed to evaluate astigmatism correction by toric intraocular lenses (IOLs) might be optimized to obtain a more complete analysis of their results.First, the authors state that vectorial analysis was performed to determine the refractive astigmatic changes. The target induced astigmatism, surgically induced astigmatism, and difference vector were investigated using the Alpins method.

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mentioning

confidence: 99%

“…We read with interest the paper by Krall et al 1 We found that the methods they followed to evaluate astigmatism correction by toric intraocular lenses (IOLs) might be optimized to obtain a more complete analysis of their results.…”

mentioning

confidence: 99%

Vector analysis after toric intraocular lens implantation to correct astigmatism

Savini¹,

Ducoli²,

Schiano-Lomoriello³

2015

Journal of Cataract and Refractive Surgery

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We read with interest the paper by Krall et al. 1 We found that the methods they followed to evaluate astigmatism correction by toric intraocular lenses (IOLs) might be optimized to obtain a more complete analysis of their results.First, the authors state that vectorial analysis was performed to determine the refractive astigmatic changes. The target induced astigmatism, surgically induced astigmatism, and difference vector were investigated using the Alpins method. It seems, therefore, that neither corneal astigmatism nor IOL toricity was taken into consideration. We believe that in such a study, this kind of information should be provided and analyzed. Considerable discrepancy might exist, in fact, between refractive astigmatism and corneal astigmatism. Moreover, when toric IOLs are implanted, calculations are based on corneal astigmatism and not on refractive astigmatism.Second, in the results section, the authors report that they did not find a statistically significant change in the corneal topographic or keratometric flat or steep meridian between the preoperative and postoperative measurements. However, it would have been useful to report the mean surgically induced corneal astigmatism. In this regard, we were surprised to read, "The incisions were placed at the 12 o'clock position to ensure that no surgically induced corneal astigmatism would influence the preexisting corneal astigmatism." To our knowledge, there is no scientific demonstration that a superior incision does not induce any corneal astigmatism.Third, given that keratometric astigmatism has been shown to lead to cylinder overcorrection in eyes with with-the-rule (WTR) astigmatism and undercorrection in eyes with against-the-rule (ATR) astigmatism, 2 it would have been interesting to separately analyze eyes with WTR and ATR astigmatism.Because many factors play a role in the refractive outcome of toric IOL implantation (eg, induced corneal astigmatism, corneal astigmatism, IOL toricity at the IOL plane and at the corneal plane), we believe that a more comprehensive analysis, like the one recently described, 2 would be able to provide a more complete understanding of the surgical results. Vector analysis of astigmatism correction after toric intraocular lens implantation. J Cataract Refract Surg 2015; 41:790-799 2. Savini G, Naeser K. An analysis of the factors influencing the residual refractive astigmatism after cataract surgery with toric intraocular lenses. Invest Ophthalmol Vis Sci 2015; 56:827-835 Q 2015 ASCRS and ESCRS Published by Elsevier Inc. http://dx.

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Vector analysis of astigmatism correction after toric intraocular lens implantation

Abstract: No author has a financial or proprietary interest in any material or method mentioned.

Cited by 30 publications

References 20 publications

Clinical Outcomes After Cataract Surgery With a New Transitional Toric Intraocular Lens

Clinical Outcomes After Cataract Surgery With a New Transitional Toric Intraocular Lens

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

Vector analysis after toric intraocular lens implantation to correct astigmatism

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