Rotational stability of a single-piece toric acrylic intraocular lens

Koshy, John; Nishi, Yutaro; Hirnschall, Nino; Črnej, Alja; Gangwani, Vinod; Maurino, Vincenzo; Findl, Oliver

doi:10.1016/j.jcrs.2010.05.018

Cited by 79 publications

(59 citation statements)

References 14 publications

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“…Several studies have shown that both LRI and toric IOL implantation provide good safety, predictability, and efficacy associated with a postoperative improvement in visual acuity (3,22,(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36) . Such studies, however, made comparisons with control groups.…”

Section: Discussionmentioning

confidence: 99%

Treatment of astigmatism during phacoemulsification

Freitas¹,

Boteon²,

Carvalho³

et al. 2014

Arquivos Brasileiros De Oftalmologia

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Purpose: To compare the effectiveness of limbal relaxing incisions (LRI) with that of toric intraocular lens (IOL) implantation for the treatment of astigmatism during phacoemulsification using nonvectorial (predictability, safety, and efficacy) and vectorial analyses. Methods: This longitudinal observational case series assessed 62 eyes of 31 consecutive cataract patients with preoperative corneal astigmatism of 0.75-2.50 diopters (D) in both eyes. Patients were randomly assigned to 2 groups: a toric IOL group, which received toric IOLs in both eyes, and an LRI group, which received spherical IOLs associated with LRI placement in both eyes. All patients were evaluated at 1, 3, and 6 months after surgery, when refractive astigmatism analysis was performed using both nonvectorial and Alpins vectorial methods. Outcomes were assessed within each group and compared between groups. Results: The proportion of eyes within ±0.50 D of the intended correction at 3 and 6 months after surgery was 75% and 71.88%, respectively, in the LRI group and 40% and 66.67%, respectively, in the toric IOL group. In the remaining period, the proportion was greater in the toric IOL group. The safety index showed no difference at any time point. The efficacy index at 1 and 3 months after surgery was significantly higher in the toric IOL group (0.43 and 0.44, respectively) than in the LRI group (0.31 and 0.36, respectively). At 6 months after surgery, the status of eyes in the LRI group was as follows: 53.13% were undercorrected, 43.74% achieved the intended correction, and 3.13% were overcorrected. In the toric IOL group, 16.76% eyes were undercorrected, 76.67% achieved the intended correction, and 6.67% were overcorrected. The success rates for astigmatic surgery, astigmatism reduction at the intended axis, and astigmatism corrected were 43%, 62%, and 64%, respectively, in the LRI group and 57%, 81%, and 94%, respectively, in the toric IOL group. Conclusions: Our results suggest that the use of toric IOLs may be advantageous over the use of LRIs for the treatment of astigmatism during phacoemulsification. Although such advantages seem subtle in nonvectorial analyses, they are highlighted in vectorial analyses.

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Section: Discussionmentioning

confidence: 99%

Treatment of astigmatism during phacoemulsification

Freitas¹,

Boteon²,

Carvalho³

et al. 2014

Arquivos Brasileiros De Oftalmologia

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“…(Ahmed, Rocha et al 2010;Gayton and Seabolt 2010;Koshy, Nishi et al 2010;Visser, Ruiz-Mesa et al 2011) In the majority of these studies, PCO did not compromise the visual outcome and a neodymium:YAG posterior capsulotomy was not required. Too few studies have been performed with Rayner toric or Acri.Comfort toric IOLs to evaluate the incidence of PCO.…”

Section: Posterior Capsule Opacificationmentioning

confidence: 96%

“…This may be done with the patient seated at the slitlamp and with a coaxial thin slit turned to 0-180 degrees. (Mendicute, Irigoyen et al 2008;Alio, Agdeppa et al 2010;Koshy, Nishi et al 2010) The www.intechopen.com limbus is than marked at the horizontal position with either a sterile ink pen or a needle. Another technique to mark the horizontal axis is by using a bubble-marker, such as a Nuijts/Lane Toric Reference Marker (ASICO) (Figure 2) or a Bakewell BubbleLevel (Mastel Precision, Rapid City, US), or by using a gravity marker with a calibrated horizontal position, such as the LRI Gravity Marker (Rumex, Sint Petersburg, Florida, US).…”

Section: Marking Techniquesmentioning

confidence: 99%

“…(Koshy, Nishi et al 2010) Finally, Kwartz et al compared the rotational stability of Acrysof IOLs and Akreos IOLs and showed that both IOLs rotate 2 to 3 degrees within a 2-year period. (Kwartz and Edwards 2010) However, both latter studies did not compensate for cyclotorsion of the eye between measurements both with the patient in an upright position, which has been shown to be approximately 2 degrees.…”

Section: Rotational Stabilitymentioning

confidence: 99%

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Toric Intraocular Lenses in Cataract Surgery

Visser¹

2012

Astigmatism - Optics, Physiology and Management

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“…Rotational stability of toric IOL is an issue of major concern, once proper alignment is critical for compensating corneal cylinder, resulting in good uncorrected vision. Each degree of rotation causes an average loss of cylinder power of approximately 3%; thus, when an IOL rotates 30 degrees there is no astigmatic correction, although there is a change of axis (44,(46)(47)(48)(49)(50)(51)(52)(53)(54)(55) . Articles comparing the use of toric IOL to other astigmatism reducing techniques, such as opposed clear corneal incisions (56) or LRI (57) , are still scanty in number on literature.…”

Section: B) Non-incisional Approachmentioning

confidence: 99%