True rotational stability of a single-piece hydrophobic intraocular lens

2018 ◽  
Vol 103 (2) ◽  
pp. 186-190 ◽  
Author(s):  
Daniel Schartmüller ◽  
Sabine Schriefl ◽  
Luca Schwarzenbacher ◽  
Christina Leydolt ◽  
Rupert Menapace
Keyword(s):  
Influencing Factors ◽  
Intraocular Lens ◽  
Axial Length ◽  
Rotational Stability ◽  
Confounding Factors ◽  
Time Points ◽  
Single Piece ◽  
Aspheric Iol ◽  
Significant Difference ◽  
Hydrophobic Acrylic

BackgroundTo evaluate rotation and its influencing factors of an aspheric one-piece hydrophobic acrylic intraocular lens (IOL) Vivinex XY1 during 6 months after operation.MethodsIn this institutional trial, 122 eyes of 66 patients were implanted with a non-toric aspheric IOL Vivinex XY1 (Hoya Corporation, Tokyo, Japan). IOL alignment was assessed at the end of surgery, 1 hour, 1 week, 1 month and 6 months after implantation. Confounding factors such as axial length, presence of anterior fibrosis and randomised implantation in four different intended axes (0°, 45°, 90°, 135°) were evaluated. Decentration and tilt were measured using a Purkinje metre.ResultsAssessment of rotational stability was possible for 103 of 122 implanted IOLs 6 months after eye surgery. The median absolute rotation was 1.1° (range: 0°–5°). Rotation was significantly increased within the first hour after operation compared with later time-points (p<0.001). No correlation was found with axial length and rotation (Spearman’s r=0.048, p=0.63). No significant difference was observed regarding different implantation axes (p=0.75). Rotation was not influenced by the presence of anterior fibrosis (p=0.98).ConclusionAssessing the true IOL position at the end of surgery is crucial for the evaluation of rotational stability of IOLs. No IOL rotation exceeding 5° could be detected 6 months after surgery.

Rotational stability of a single-piece hydrophobic acrylic intraocular lens: New method for high-precision rotation control

2007 ◽  
Vol 33 (5) ◽  
pp. 800-803 ◽  
Author(s):  
Frank Weinand ◽  
Annette Jung ◽  
Alexandra Stein ◽  
Andreas Pfützner ◽  
Ralph Becker ◽  
...  
Keyword(s):  
High Precision ◽  
Intraocular Lens ◽  
New Method ◽  
Rotational Stability ◽  
Single Piece ◽  
Hydrophobic Acrylic

Comparison of Five Intraocular Lens Power Formulas to Predict Postoperative Refraction Accuracy

2021 ◽  
Vol 11 (1) ◽  
pp. 129-134
Author(s):  
Tiecheng Wang ◽  
Shaochong Bu ◽  
Fang Tian ◽  
Hong Zhang
Keyword(s):  
Intraocular Lens ◽  
Axial Length ◽  
Prediction Accuracy ◽  
Short Axis ◽  
Post Surgery ◽  
Age Related ◽  
Large Patient ◽  
Significant Difference ◽  
Hyperopic Shift ◽  
Intraocular Lens Calculation

The present study sought to investigate and compare the accuracy of two third-generation intraocular lens calculation formulas contrasted against three new-generation intraocular lens calculation formulas regarding their ability to predict postoperative refraction following cataract surgery. A retrospective case study following 172 patients (172 eyes) exhibiting age-related cataracts in their eyes who were subject to phacoemulsification between September 2017 and September 2018 at the Department of Cataracts, Tianjin Medical University Eye Hospital, was carried out. Based upon ocular axial length, the sampled patients were grouped into a short axis group (ocular axial length ≤ 22 mm; 17 cases; 17 eyes), a normal axis group (22 mm < ocular axial length ≥ 24.5 mm; 132 cases; 132 patients), and a long axis group (ocular axial length > 24.5 mm; 23 cases; 23 eyes); mean absolute prediction error (MAE) postoperative refraction in each group was determined using five formulas, and the percentage of eyes displaying postoperative myopic shift symptoms, postoperative hyperopic shift symptoms, alongside the percentage of eyes displaying postoperative refractive shift symptoms in the range of (−0.25 to 0.25 D, −0.50 to 0.50 D, −1.00 to 1.00 D), were all calculated following the procedures of the five selected formulas. The MAE of the 172 patient cases was compared within the five selected formulas, and SRK/T possessed the highest prediction accuracy, exhibiting a significant difference from the other four formulas (P < 0.05), with accuracy levels subsequently followed by the Holladay 1 and Barrett Universal II formulas-however, the two formulas lacked a significant difference between them (P > 0.05). In addition, the MAE of the normal axial group was compared and analyzed within the five formulas, with analysis revealing that the SRK/T, Holladay 1, and Barrett Universal II formulas exhibited strong prediction accuracy, with no significant difference present among these three formulas (P > 0.05), and also revealing a significantly difference between the aforementioned formulas and remaining two formulas (P < 0.05). For further analysis, the MAE of the short axis group was compared, and the SRK/T and Haigis (Holladay 1, and Barrett Universal II) demonstrated stronger prediction accuracy when compared to the Olsen formula (P < 0.05). Finally, the MAE of the long axis group was compared, and it was found that the SRK/T and Barrett Universal II formulas exhibits the best prediction accuracy, followed by the Haigis and Holladay 1 formulas, with no significant difference (P > 0.05) between the former two formulas or the latter two. The majority of patients exhibited hyperopic shift post-surgery. Of the five formulas studied, the SRK/T and Barrett Universal II formulas possessed strong accuracy capable of predicting postoperative refraction. However, more long-term observation, including large patient samples, is necessary in order to corroborate our result.

scholarly journals Predictive Refractive Error Post Congenital and Developmental Cataract Surgery

2021 ◽  
Vol 17 (2) ◽  
pp. 179
Author(s):  
Eva Imelda ◽  
Feti Karfiati ◽  
Maya Sari Wahyu ◽  
Irawati Irfani ◽  
Primawita Oktarima ◽  
...  
Keyword(s):  
Cataract Surgery ◽  
Intraocular Lens ◽  
Refractive Error ◽  
Axial Length ◽  
Prediction Error ◽  
Visual Rehabilitation ◽  
Predictive Error ◽  
Age At Surgery ◽  
Significant Difference ◽  
Developmental Cataract

Abstract: Cataract is one of the leading treatable causes of visual impairment in children. Visual rehabilitation is crucial for the development of good visual function after cataract surgery in children. The research aimd to describe post-operative Predictive Refractive Error (PRE) in congenital and developmental cataracts in Cicendo National Eye Hospital from January 2017 to December 2018. This is a retrospective analytic observational study from medical records. We found 107 eyes of 62 children with congenital and developmental cataracts had had cataract surgery and primary implantation of Intraocular Lens (IOL) in Pediatric Ophthalmology and Strabismus Unit, Cicendo National Eye Hospital. The patients were divided into two groups, with axial length (AXL) of ≤ 24 mm and > 24 mm. The paired t-test was used to compare Predictive Error (PE) in SRK/T, SRK II, and Showa SRK formula. Mean age at surgery was 6.7 ± 4.0 years.  Ninety-five eyes had AXL ≤ 24 mm, and 12 eyes had AXL > 24 mm. Prediction Error from patients with AXL ≤ 24 mm was 0.29 D, and from patients with AXL > 24 mm was 2.40 D in SRK/T formula (P < 0.05). There was no significant difference between PE and Absolute Predictive Error (APE) in SRK/T, SRK II, and Showa SRK in patients with AXL > 24 mm (P > 0.05). SRK/T is the most predictable formula in patients with AXL ≤ 24 mm. There is no significant difference in patients with AXL > 24 mm in all formulas. Keywords: congenital and developmental cataract, axial length, Prediction Error, intraocular lens

Rotational stability of a single-piece toric acrylic intraocular lens

2010 ◽  
Vol 36 (10) ◽  
pp. 1665-1670 ◽  
Author(s):  
John J. Koshy ◽  
Yutaro Nishi ◽  
Nino Hirnschall ◽  
Alja Crnej ◽  
Vinod Gangwani ◽  
...  
Keyword(s):  
Intraocular Lens ◽  
Rotational Stability ◽  
Single Piece

Evaluation of uveal and capsule biocompatibility of a single-piece hydrophobic acrylic intraocular lens with ultraviolet–ozone treatment on the posterior surface

2015 ◽  
Vol 41 (5) ◽  
pp. 1081-1087 ◽  
Author(s):  
Aabid M. Farukhi ◽  
Liliana Werner ◽  
Justin C. Kohl ◽  
Gareth L. Gardiner ◽  
Joshua R. Ford ◽  
...  
Keyword(s):  
Intraocular Lens ◽  
Ozone Treatment ◽  
Posterior Surface ◽  
Single Piece ◽  
Hydrophobic Acrylic

scholarly journals Myopic Shift After Intraocular Lens Implantation in Children Less Than Two Years of Age

2018 ◽  
Vol 10 (1) ◽  
pp. 11-15
Author(s):  
Suma Ganesh ◽  
Reena Gupta ◽  
Sumita Sethi ◽  
Chandra Gurung ◽  
Raman Mehta
Keyword(s):  
Cataract Surgery ◽  
Intraocular Lens ◽  
Axial Length ◽  
Early Years ◽  
P Value ◽  
Group I ◽  
Significant Difference ◽  
Myopic Shift ◽  
Second Year ◽  
Group Ii

Purpose: The purpose of this study was to evaluate the myopic shift over a period of 2 years following implantation of intraocular lens (IOL) in children less than 2 years of age with axial length less than 22 mm.Method: A retrospective analysis of records of children below 2 years of age with axial length less than 22 mm who had undergone cataract surgery with primary IOL implantation over a period of 7 years was undertaken. Mean myopic shift was analyzed at 6 months, in first year, second year and end of 2 years following surgery.Results: Total 40 eyes of 23 children were included (mean age 13.55±7.38 months); with mean myopic shift at end of 2 years -2.35±2.15. Myopic shift in eyes with undercorrection in range of 3-4 D (group-I) and 5-7 D (group-II) was compared using Mann-Whitney test. Mean myopic shift at end of 2 years was -2.93±2.55 in group-I and -1.88±1.77 in group-II (p value not significant). There was no significant difference in myopic shift between two groups at 6 months and 1 year; a borderline significant difference was found in second year (p= 0.04).Conclusion: In our study amount of myopic shift in first two years in children with axial length less than 22 mm is below the expected normal. There was not much significant difference in the myopic shift over a period of 2 years in eyes, which were undercorrected by 3-4 D against those with 5-7 D. Thus aiming for less residual hyperopia by less undercorrection did not increase myopic shift. Thus high-level hyperopic glasses in the early years could be avoided and help in prevention of amblyopia after paediatric cataract surgery.

scholarly journals Comparison of the Retinal Straylight in Pseudophakic Eyes with PMMA, Hydrophobic Acrylic, and Hydrophilic Acrylic Spherical Intraocular Lens

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Ya-wen Guo ◽  
Jun Li ◽  
Hui Song ◽  
Xin Tang
Keyword(s):  
Cataract Surgery ◽  
Intraocular Lens ◽  
Pupil Size ◽  
Significant Difference ◽  
Intraocular Straylight ◽  
Hydrophobic Acrylic ◽  
Retinal Straylight

Purpose. To investigate the intraocular straylight value after cataract surgery.Methods. In this study, 76 eyes from 62 patients were subdivided into three groups. A hydrophobic acrylic, a hydrophilic acrylic, and a PMMA IOL were respectively, implanted in 24 eyes, 28 eyes, and 24 eyes. Straylight was measured using C-Quant at 1 week and 1 month postoperatively in natural and dilated pupils.Results. The hydrophilic acrylic IOLs showed significantly lower straylight values than those of the hydrophobic acrylic IOLs in dilated pupils at 1 week and 1 month after surgery (P<0.05). However, the straylight values of the hydrophilic acrylic IOLs were the lowest among the three IOL groups. No significant difference was observed in straylight between 1 week and 1 month postoperatively in each group with natural and dilated pupils (P>0.05). Moreover, no significant difference was found in straylight between natural and dilated pupils in each group at 1 week and 1 month postoperatively (P>0.05).Conclusions. Although the hydrophobic acrylic IOL induced more intraocular straylight, straylight differences among the 3 IOLs were minimal. Pupil size showed no effect on intraocular straylight; the intraocular straylight was stable 1 week after surgery.

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