Intraocular lens tilt and decentration, anterior chamber depth, and refractive error after trans-scleral suture fixation surgery11The authors have no proprietary interest in any of the materials described in this article.

Ophthalmology ◽  
1999 ◽  
Vol 106 (5) ◽  
pp. 878-882 ◽  
Author(s):  
Ken Hayashi ◽  
Hideyuki Hayashi ◽  
Fuminori Nakao ◽  
Fumihiko Hayashi
Keyword(s):  
Anterior Chamber ◽  
Intraocular Lens ◽  
Refractive Error ◽  
Anterior Chamber Depth ◽  
Suture Fixation ◽  
Intraocular Lens Tilt ◽  
Scleral Suture Fixation

scholarly journals Refractive Error Induced by Intraocular Lens Tilt After Intrascleral Intraocular Lens Fixation

2021 ◽  
Author(s):  
TERUAKI TOKUHISA ◽  
TOMOYUKI WATANABE ◽  
AKIRA WATANABE ◽  
TADASHI NAKANO
Keyword(s):  
Anterior Chamber ◽  
Intraocular Lens ◽  
Refractive Error ◽  
Axial Length ◽  
Optical Design ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Design Program ◽  
Department Of Ophthalmology ◽  
Postoperative Anterior Chamber Depth

Abstract Purpose To investigate the spherical shift of Intraocular lens (IOL) tilt after intrascleral fixationMethods We retrospectively reviewed the medical records of patients who underwent flanged intrascleral IOL fixation with transconjunctival 25- or 27-gauge pars plana vitrectomy at the Department of Ophthalmology of Jikei University Hospital with a minimum follow-up duration of three months. Second-generation anterior segment optical coherence tomography (CASIA2; TOMEY) was used to obtain the tilt and decentration of intrasclerally fixated IOL and postoperative anterior chamber depth. We investigated the relationship of the refractive error with these parameters, axial length, and keratometry. In addition to the clinical investigation, we performed optical simulations using the Zemax optical design program for studying the spherical shift of the IOL tilt by means of the through-focus response and change of spherical equivalent power.Results The study involved 72 eyes of 67 patients. The degree of IOL tilt was correlated with the amount of refractive error (Spearman's rank correlation coefficient [CC] = −0.32; P = 0.006). In particular, a tilt angle greater than 10° strongly influenced the refractive error. Postoperative anterior chamber depth also correlated with the refractive error (CC = 0.50; P < 0.001). The refractive error did not correlate with decentration (CC = −0.17; P = 0.15), axial length (CC = −0.08; P = 0.49), and keratometry (CC = −0.06; P =0.64). Optical simulations using the Zemax optical design program also showed a myopic shift exponentially as the tilt becomes greater. Conclusion An IOL tilt greater than 10 ° induces refractive error.

scholarly journals Accuracy of intraocular lens calculation formulas in cataract patients with steep corneal curvature

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0241630
Author(s):  
Chenguang Zhang ◽  
Guangzheng Dai ◽  
Emmanuel Eric Pazo ◽  
Ling Xu ◽  
Xianwei Wu ◽  
...  
Keyword(s):  
Anterior Chamber ◽  
Intraocular Lens ◽  
Refractive Error ◽  
Anterior Chamber Depth ◽  
Covariance Analysis ◽  
Corneal Curvature ◽  
Refractive Power ◽  
Iol Power ◽  
Cataract Patients ◽  
Intraocular Lens Calculation

Objective To compare the accuracy of five kinds of intraocular lens calculation formulas (SRK/T, Haigis, Hoffer Q, Holladay and Barrett Universal Ⅱ) in cataract patients with steep curvature cornea ≥ 46.0 diopters. Methods This is a retrospective study of cataract phacoemulsification combined with intraocular lens implantation in patients with steep curvature cornea (corneal curvature ≥ 46D). The refractive prediction errors of IOL power calculation formulas (SRK/T, Haigis, Holladay, Hoffer Q, and Barrett Universal II) using User Group for Laser Interference Biometry (ULIB) constants were evaluated and compared. Objective refraction results were assessed at one month postoperatively. According to axial length (AL), all patients were divided into three groups: short AL group (<22mm), normal AL group (>22 to ≤24.5mm) and long AL group (>24.5mm). Calculate the refractive error and absolute refractive error (AE) between the actual postoperative refractive power and the predicted postoperative refractive power. The covariance analysis was used for the comparison of five formulas in each group. The correlation between the absolute refractive error and AL from every formula were analyzed by Pearson correlation test, respectively. Result Total 112 eyes of 83 cataract patients with steep curvature cornea were collected. The anterior chamber depth (ACD) was a covariate in the short AL group in the covariance analysis of absolute refractive error (P<0.001). The SRK/T and Holladay formula had the lowest mean absolute error (MAE) (0.47D), there were statistically significant differences in MAE between the five formulas for short AL group (P = 0.024). The anterior chamber depth had no significant correlation in the five calculation formulas in the normal AL group and long AL group (P = 0.521, P = 0.609 respectively). In the normal AL group, there was no significant difference in MAE between the five calculation formulas (P = 0.609). In the long AL group, Barrett Universal II formula had the lowest MAE (0.35), and there were statistically significant differences in MAE between the five formulas (P = 0.012). Over the entire AL range, the Barrett Universal II formula had the lowest MAE and the highest percentage of eyes within ± 0.50 D, ± 1.00 D, and ± 1.50 D (69.6%, 93.8%, and 98.2% respectively). Conclusion Compared to SRK/T, Haigis, Hoffer Q, and Holladay, Barrett Universal Ⅱ formula is more accurate in predicting the IOL power in the cataract patients with steep curvature cornea ≥ 46.0 diopters.

scholarly journals A calculator proposal for estimating refractive error after 3 years using the onset biometric values in primary school children: a cohort study

2021 ◽  
Author(s):  
Feride Tuncer Orhan ◽  
Haluk Huseyin Gürsoy
Keyword(s):  
Primary School ◽  
Anterior Chamber ◽  
Refractive Error ◽  
Axial Length ◽  
Anterior Chamber Depth ◽  
Primary School Children ◽  
Optical Parameters ◽  
Spherical Equivalent ◽  
Final Data ◽  
The Mean

Aim To evaluate consecutive measurements of the biometric parameters, age, and refraction error in a Turkish population at primary school age. Materials and Methods A total of 197 children aged between 7-12 years were included. The data of three consecutive measurements of children, who were examined at least once a year for three years using both cycloplegic auto-refractometry and optical biometry, were used in this retrospective study. Spherical equivalent <-0.50D was considered to be myopic; >+0.75D was considered to be hypermetropic. Age, gender, body mass index, spherical equivalent, axial length, anterior chamber depth, central corneal thickness, keratometry, and lens thickness were analyzed. The onset data obtained in 2013 whereas, the final data were from 2015. Logistic and Cox regression analyses were performed (p<0.05). Results The mean of the onset and the final spherical equivalents were 0.19D (0.56), and 0.08D (0.80), respectively. The myopia prevalence was increased among refractive errors in observation periods (univariable analysis p=0.029; multivariable analysis p=0.017). The onset axial length (HR:4.55, 95%CI:2.87-7.24, p<0.001), keratometry (HR:2.04, 95%CI:1.55-2.67, p<0.001) and age (HR:0.73, 95%CI: 0.57-0.92, p=0.009) correlated myopia progression. To calculate the estimated spherical equivalent, the onset data were included in the logistic regression model. The onset data of spherical equivalent (β=0.916, p<0.001), axial length (β=-0.451, p<0.001), anterior chamber depth (β=0.430, p=0.005) and keratometry (β=-0.172, p<0.001) were found to be significantly associated with the mean SE at the final data. Conclusions To calculate the estimated spherical equivalent following three years, an equation was proposed. The estimated refractive error of children can be calculated by using the proposed equation with the associated onset optical parameters.

scholarly journals A Case of Repeating Transient Increase in Intraocular Pressure by Instability of an Intraocular Lens Implanted in the Capsular Bag

2020 ◽  
Vol 11 (1) ◽  
pp. 60-67
Author(s):  
Yukihisa  Takada ◽  
Takayoshi Sumioka ◽  
Nobuyuki Ishikawa ◽  
Shingo Yasuda ◽  
Ryoko Komori ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Anterior Chamber ◽  
Intraocular Lens ◽  
Anterior Chamber Depth ◽  
Acute Angle ◽  
University Hospital ◽  
Angle Closure ◽  
Light Reaction ◽  
Narrow Angle ◽  
Medical University

We observed repeated episodes of rapid increases in intraocular pressure (IOP) considered to be caused by an in-the-bag intraocular lens (IOL) instability in a patient with an implanted IOL. As acute glaucoma attack-like increase in IOP was noted in the left eye on November 8, she was admitted to Wakayama Medical University Hospital. The findings at the first examination included an IOP of 62 mm Hg, instability of a PMMA one-piece IOL, shallow anterior chamber, narrow angle, moderate mydriasis, and loss of pupillary light reaction in the left avitreous eye. On November 15, a 6-mm Hg increase in IOP was observed during 60-min dark room prone provocative testing. After the first examination, the patient perceived pain and reduced visual acuity of the left eye and emergently consulted our hospital twice. Despite miosis, normalization of the anterior chamber depth and IOP with widening of the angle were achieved by resting in the supine position. These episodes were thought to be caused by instability and anterior shift of the IOL. On January 17, 2018, suture fixation of the in-the-bag IOL was performed. The IOL was fixed by transscleral suturing of the bilateral supporting parts to the sclera. Recurrence of sudden ophthalmalgia, instability of the in-the-bag IOL, and an increase in IOP have not been observed for 1 year after surgical treatment. Instability of an in-the-bag IOL caused repeated acute angle-closure glaucoma-like attacks. The situation was well treated by suturing and fixing the haptics of IOL to the sclera.

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