scholarly journals Influence of lens position as detected by an anterior segment analysis system on postoperative refraction in cataract surgery

2021 ◽  
Vol 14 (7) ◽  
pp. 1006-1012
Author(s):  
Jia-Ju Zhang ◽  
◽  
Chen Li ◽  
Yi-Hong Cao ◽  
Pei-Rong Lu ◽  
...  
Keyword(s):  
Linear Regression ◽  
Prediction Error ◽  
Linear Regression Analysis ◽  
Anterior Segment ◽  
Final Analysis ◽  
Prediction Formula ◽  
Weak Correlation ◽  
Lens Position ◽  
Iol Power ◽  
Analysis System

AIM: To predict postoperative intraocular lens (IOL) position using the Sirius anterior segment analysis system and investigate the effect of lens position and IOL type on postoperative refraction. METHODS: A total of 97 patients (102 eyes) were enrolled in the final analysis. An anterior segment biometry measurement was performed preoperatively with Sirius and Lenstar. The results of predicted lens position (PLP) and IOL power were automatically calculated by the software used by the instruments. Effective lens position (ELP) was measured manually using Sirius 3mo postoperatively. Pearson’s correlation analysis and linear regression analysis were used to determine the correlation of lens position to other parameters. RESULTS: PLP and ELP were positively correlated to axial length (AL; r=0.42, P<0.0001 and r=0.49, P<0.0001, respectively). There was a weak correlation between the peLP (ELP-PLP) and the prediction error of spherical refraction (peSR; r=0.34, P<0.0001). The peLP of Softec HD IOL differed statistically from those of both the TECNIS ZCB00 and Sensor AR40E IOLs. Multiple linear regression was used to obtain the prediction formula: ELP=0.66+0.63× [aqueous depth (AQD)+0.6LT] (r=0.61, P<0.0001), and a new variable (AQD+0.6 LT) was found to have the strongest correlation with ELP. CONCLUSION: The Sirius anterior segment analysis system is helpful to predict ELP, which reduces postoperative refraction error.

scholarly journals Ball Possession Strategies in Elite Soccer According to the Evolution of the Match-Score: the Influence of Situational Variables

2010 ◽  
Vol 25 (1) ◽  
pp. 93-100 ◽  
Author(s):  
Carlos Lago-Peñas ◽  
Alexandre Dellal
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Coefficient Of Variation ◽  
Linear Regression Analysis ◽  
Match Analysis ◽  
Multiple Camera ◽  
Situational Variables ◽  
The Status ◽  
Analysis System ◽  
Match Score

Ball Possession Strategies in Elite Soccer According to the Evolution of the Match-Score: the Influence of Situational VariablesIn soccer, the ability to retain possession of the ball for prolonged periods of time has been suggested to be linked to success. The accuracy of this assertion was investigated by examining 380 matches involving Spanish League First Division teams during the 2008-2009 season. Possession of the ball, according to the status of the match (winning, drawing and losing), was recorded during the different matches using a multiple-camera match analysis system (Gecasport®). The results suggest that the best classified teams maintained a higher percentage of ball possession and that their pattern of play was more stable. The coefficient of variation, with respect to ball possession per match, was smaller for the best placed teams. Indeed, first placed F.C. Barcelona had the smallest coefficient of variation for possession time (8.4%), while bottom placed Recreativo showed the highest values with 17.1%. Linear regression analysis showed that possession strategies were influenced by situation variables. Team possession was greater when losing than when winning (p<0.01) or drawing (p<0.01), home teams enjoyed greater possession than visiting teams (p<0.01), and playing against strong opposition was associated with a reduction in time spent in possession (p<0.01). The findings indicate that strategies in soccer are influenced by situational variables and that teams alter their playing style accordingly during the match.

scholarly journals Preoperative Anatomy Parameters in Implantable Collamer Lenses

2021 ◽  
Author(s):  
Yanzhen Xue ◽  
Yonghong Guo ◽  
Ruibo Zhao
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Anterior Chamber ◽  
Linear Regression Analysis ◽  
Corneal Thickness ◽  
Intraclass Correlation ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Case Series ◽  
Significant Difference

Abstract Purpose: To determine patient preoperative anatomical features and the parameters of implantable collamer lenses (ICLs) relevant in explaining vault variability.Setting: Ophthalmology Xi’an Aier Gucheng Eye hospital , Xi’an China.Design: Retrospective case series.Methods:This study comprised 88 eyes of 45 patients implanted with myopic or toric ICLs between May 2021 and August 2021.Pentacam imaging was used for assessing white-to-white (WTW) diameter, central keratometry, anterior chamber depth(ACD), central corneal thickness and vault. Anterior-segment optical coherence tomography（AS-OCT） was used to measure the horizontal anterior chamber angle distance (ATA). Ultrasound biomicroscopy (UBM) was used to measure horizontal and vertical sulcus to sulcus(vSTS). According to different ACD,we divide ACD into shallow group(2.8 to 3.2 mm),medium group(3.2 to 3.5 mm),and deep group(＞3.5mm).Results: Linear regression analysis found significant correlation between WTW diameters and ATA diameters( y= 0.9605x+0.1491,R² = 0.9148),with a coefficient of determinant of 0.9148 (P＜0.01). Linear regression analysis found significant correlation between hSTS and vSTS（y=0.9855x-0.0178,R²=0.1979）,with a coefficient of determinant of 0.1979 (P＜0.01). WTW diameters showed statistically significant difference in shallow and medium ACD (t=-3.28,P＜0.01 ), significant difference in shallow and deep ACD (t=-4.69,P＜0.01 ),there was no correlation in medium and deep ACD(t=-1.41,P＞0.05 ). There was a statistically significant correlation between WTW diameters and hSTS diameters when the ACD was less than 3.5 mm (t=-0.451, P=0.000) (t=1.406, P=0.026),but weak correlation when the ACD was bigger than 3.5 mm(t=1.594, P=0.051). ATA and WTW with a mean difference close to zero(-0.66 mm). Despite the relatively high correlation (intraclass correlation co-efficient =0.689), the range of agreement is quite broad (1.33 mm).Conclusions:ATA measured with AS-OCT can not be used interchangeably with WTW obtained with Pentacam. WTW diameters and hSTS diameters have a statistically significant correlation when the ACD was less than 3.5 mm. WTW, ATA, hSTS and vSTS all should be considered during design the size of lens and regulating the vault after surgery.

scholarly journals Relationship between Crystalline Lens Thickness and Shape and the Identification of Anterior Ocular Segment Parameters for Predicting the Intraocular Lens Position after Cataract Surgery

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Tsukasa Satou ◽  
Kimiya Shimizu ◽  
Shuntaro Tsunehiro ◽  
Akihito Igarashi ◽  
Sayaka Kato ◽  
...  
Keyword(s):  
Cataract Surgery ◽  
Intraocular Lens ◽  
Prediction Error ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Crystalline Lens ◽  
Lens Thickness ◽  
Lens Position ◽  
The Difference ◽  
Segment Data

Purpose. This study was performed to investigate the relationships among crystalline lens shape, actual intraocular lens (IOL) position, and crystalline lens thickness (LT), as measured by anterior segment optical coherence tomography (AS-OCT), and to determine anterior ocular segment parameters that predict postoperative IOL position. Methods. Seventy-nine eyes of 79 patients who underwent uneventful cataract surgery were enrolled. For crystalline lens preoperative anterior segment data, the LT, and anterior, equatorial, and posterior surface depths (ASD, ESD, and PSD, respectively) of crystalline lenses were quantitatively determined. For postoperative anterior segment data, the actual IOL position was quantified. Moreover, the following correlations were analyzed: LT with the ASD, ESD, PSD, and IOL position; IOL position with the ASD, ESD, and PSD; and refractive prediction error with the difference between the predicted postoperative anterior chamber depth (ACD) of the SRK/T formula and the IOL position, ASD, ESD, and PSD (each depth minus the predicted postoperative ACD of the SRK/T formula). Results. The LT was significantly correlated with the ASD (r = -0.65) and PSD (r = 0.41), whereas it was not correlated with the ESD or IOL position. The IOL position was significantly correlated with the ASD (r = 0.67), ESD (r = 0.72), and PSD (r = 0.74). The refractive prediction error was significantly correlated with the difference between the predicted postoperative ACD of the SRK/T formula and the IOL position (r = 0.65), ASD (r = 0.46), ESD (r = 0.54), and PSD (r = 0.58). Conclusions. The ESD and PSD obtained using AS-OCT were highly correlated with the IOL position and significantly correlated with the refractive prediction error. These findings suggest that the ESD and PSD may enhance the accuracy of actual IOL position prediction.

scholarly journals Estimation of Motor Impairment and Usage of Upper Extremities during Daily Living Activities in Poststroke Hemiparesis Patients by Observation of Time Required to Accomplish Hand Dexterity Tasks

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Tomoko Tanaka ◽  
Toyohiro Hamaguchi ◽  
Makoto Suzuki ◽  
Daigo Sakamoto ◽  
Junpei Shikano ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Upper Extremity ◽  
Daily Living ◽  
Linear Regression Analysis ◽  
Motor Impairment ◽  
Prediction Formula ◽  
Item Score ◽  
Hand Dexterity ◽  
Time Required

Aim. This study evaluated whether specific actual performance could accurately predict body function levels and upper limb use in the real-life functioning of poststroke hemiparesis patients to aid in choosing the most appropriate rehabilitation exercises. Methods. We measured the time taken for poststroke patients to move small objects with the paralyzed hand and investigated how the measurement could estimate upper extremity motor impairment and hand usage during activities of daily living (ADL). We examined 86 stroke patients (age 66 ± 16 years) whose upper extremity motor paralysis was measured using the Fugl-Meyer assessment (FMA) and Southampton Hand Assessment Procedure (SHAP), and patient-reported ADL was investigated using the Jikei Assessment Scale for Motor Impairment in Daily Living (JASMID). To identify the time required to perform each SHAP item, we employed a linear regression analysis. The prediction formula was used in the linear regression analysis, and the coefficient of determination (R2) was applied to compare each component item score that was obtained with the predicted values derived from the linear regression analysis. Results. The most easily accomplished task was Heavy Power in the SHAP. The R2 between the SHAP Heavy Power item score and the FMA scores was moderate (R2 = 0.344, P<0.0001), whereas the R2 with the JASMID score was low (R2 = 0.126, P<0.001). Conclusions. By measuring the time it takes for poststroke hemiparesis patients to hold and move an object, we developed a prediction formula for upper extremity motor function and hand dexterity.

Computed tomography measurements of intraocular structures of the feline eye

2019 ◽  
Vol 184 (21) ◽  
pp. 651-651 ◽  
Author(s):  
Shawn Sreenivasan Chandrakumar ◽  
Alex zur Linden ◽  
Mark Owen ◽  
Sarah Pemberton ◽  
Chantale L Pinard ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Body Weight ◽  
Regression Analysis ◽  
Retrospective Study ◽  
Optic Nerve ◽  
Linear Regression ◽  
Linear Regression Analysis ◽  
Weak Correlation ◽  
Short Hair ◽  
Male Patients

Diagnostic imaging of the eye can be performed using ultrasonography, MRI or CT. This study describes the CT dimensions, volumes and radiodensities of presumed normal feline intraocular structures. Nineteen adult patients were included in this retrospective study. Fourteen males and five females were included, with domestic short hair (DSH) being the predominant breed. Length, volume and radiodensity values for the lens, anterior chamber, vitreous chamber and optic nerve were calculated as well as measurements of the optic nerve width. There was no significant correlation found on linear regression analysis comparing patient’s body weight with the various ocular measurements. Measurements of the lens, globe and optic nerve had significant differences (P<0.05) noted between the sexes, with males having increased values. These results may be skewed due to the large majority of male patients in the study. There was a weak correlation found between age and right eye (OD) optic nerve width, with an increase in the optic nerve width noted with increasing age. The findings of this study are a first step in establishing CT reference values for feline intraocular structure measurements.

scholarly journals The Correlation between Serum Selenium and Blood Selenium in Cattle

1992 ◽  
Vol 4 (1) ◽  
pp. 48-52 ◽  
Author(s):  
John Maas ◽  
Francis D. Galey ◽  
John R. Peauroi ◽  
James T. Case ◽  
E. Sue Littlefield ◽  
...  
Keyword(s):  
Linear Regression ◽  
Prediction Interval ◽  
Linear Regression Analysis ◽  
Hydride Generation ◽  
Argon Plasma ◽  
Prediction Intervals ◽  
Serum Selenium ◽  
Prediction Formula ◽  
Serum Samples ◽  
Inverse Prediction

The selenium (Se) concentration of paired blood and serum samples from cattle was determined by 2 methods: 1) atomic absorption spectroscopy using hydride generation (HG-AAS), and 2) inductively coupled argon plasma emission spectroscopy using hydride generation (ICP). Samples from 327 cattle were analyzed by HG-AAS, and samples from 344 cattle were analyzed by ICP. The data were examined by linear regression analysis, and the technique of inverse prediction was utilized to determine prediction intervals for estimating blood Se concentration from known serum Se concentration. The correlation coefficients, by simple linear regression of serum Se on blood Se, were 0.79 ( r2 = 0.62) and 0.88 ( r2 = 0.77) for the HG-AAS data and the ICP data, respectively. For the HG-AAS data, the inverse prediction formula for estimating blood Se when serum Se is known, at the 95% prediction interval, was For the ICP data, the inverse prediction formula for estimating blood Se when serum Se is known, at the 95% prediction interval, was The prediction intervals were quite wide, and the accuracy of estimating blood Se from a known serum Se was not useful for diagnostic purposes. The use of serum Se concentration to assess nutritional status of cattle with respect to Se does not appear to be appropriate.

Predictability of formulae for intraocular lens power calculation according to the age of implantation in paediatric cataract

2018 ◽  
Vol 103 (1) ◽  
pp. 106-111 ◽  
Author(s):  
Byung Joo Lee ◽  
Sang-Mok Lee ◽  
Jeong Hun Kim ◽  
Young Suk Yu
Keyword(s):  
Linear Regression ◽  
Intraocular Lens ◽  
Congenital Cataract ◽  
Linear Regression Analysis ◽  
Final Analysis ◽  
Absolute Error ◽  
Posterior Chamber ◽  
Power Calculation ◽  
Age Group ◽  
Iol Implantation

AimsTo analyse the predictability of diverse intraocular lens (IOL) power calculation formulae in paediatric patients with congenital cataract.MethodsThe medical records of patients who underwent cataract surgery and posterior chamber IOL implantation (in-the-bag) for congenital cataract before 17 years of age were reviewed retrospectively. Target refractions calculated by Sanders-Retzlaff-Kraff (SRK)/II, SRK/T and Hoffer-Q formulae were compared with the actual refraction. Patients were subgroup according to the age at IOL implantation (age group 0–24 months, 25–60 months, 61–120 months, 121–203 months), and we compared mean prediction error (PE) and mean absolute error (AE) for each formula. Corrected AE was obtained by linear regression analysis.ResultsTotally 481 eyes were included in the final analysis. Both SRK/II and SRK/T yielded the lowest mean AE in the age group 0–24 months and SRK/II yielded the lowest mean AE in the age group 25–60 months. For every formula, the mean PE was positive during the first five years of age, which converged to zero according to age as IOL implantation increases. The tendency for immediate postoperative overcorrection in younger patients (<6 years) could be improved by corrected formulae based on the linear regression equation.ConclusionsPatients with congenital cataract who underwent IOL implantation within 5 years of age showed higher AE than the older ones did. Among the three formulae evaluated, SRK/II consistently provided the best predictive result in these patients. For patients aged >10 years, all three formulae showed favourable predictive abilities.

scholarly journals Intraocular Pressure and Anterior Segment Morphometry Changes after Uneventful Phacoemulsification in Type 2 Diabetic and Nondiabetic Patients

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
João N. Beato ◽  
David Reis ◽  
João Esteves-Leandro ◽  
Manuel Falcão ◽  
Vítor Rosas ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Intraocular Pressure ◽  
Linear Regression ◽  
Linear Regression Analysis ◽  
Anterior Segment ◽  
Multivariate Linear Regression Analysis ◽  
Lowering Effect ◽  
Type 2 Diabetic

Purpose. To compare intraocular pressure (IOP) and anterior segment (AS) morphometry changes after uneventful phacoemulsification between nonglaucomatous eyes with open-angles from patients with and without type 2 diabetes mellitus (DM) and determine which factors may predict greater IOP-lowering effect. Methods. Forty-five diabetic (45 eyes) and 44 (44 eyes) age- and sex-matched non-DM patients with age-related cataract were enrolled in this prospective observational study. Goldmann applanation tonometry and AS Scheimpflug tomography (Pentacam® HR) were performed preoperatively and at 1- and 6-month follow-up. Linear regression analysis was performed to evaluate the clinical variables related to postoperative IOP changes at 6 months. Results. There was a significant postoperative IOP reduction 6 months after surgery (p<0.001) by an average of 2.9 ± 2.9 mmHg (15.5%) and 2.4 ± 2.8 mmHg (13.0%) in the DM group and non-DM groups (p=0.410), respectively. All AS parameters (anterior chamber depth, volume, and angle) increased significantly postoperatively (p<0.001). Multivariate linear regression analysis showed that higher preoperative IOP was significantly associated with IOP reduction at 6-month follow-up (p<0.05). Conclusion. Nonglaucomatous eyes with open-angles from both type 2 diabetic and nondiabetic patients experienced similar AS changes and IOP reductions following uneventful phacoemulsification, and this IOP-lowering effect was strongly correlated with preoperative IOP.

scholarly journals ANALYSIS OF ORGANIC MATERIAL CONTENT AND ABUNDANCE OF MACROZOOBENTHOS IN THE SOUTH BENGKALIS ISLAND, RIAU PROVINCE

2021 ◽  
Vol 4 (2) ◽  
pp. 127-133
Author(s):  
Muhamad Razid ◽  
Bintal Amin ◽  
Efriyeldi Efriyeldi
Keyword(s):  
Organic Matter ◽  
Regression Analysis ◽  
Linear Regression ◽  
Linear Regression Analysis ◽  
Organic Matter Content ◽  
Matter Content ◽  
Survey Method ◽  
Simple Linear Regression ◽  
Weak Correlation ◽  
Sediment Samples

This study was conducted in July-August 2020 by using sediment samples and macrozoobenthos in the southern part of Bengkalis Island, Riau Province. The aim of this study is to find out how much the organic matter content, the abundance of macrozoobenthos, and the correlation between the organic matter content of the sediments to the abundance of macrozoobenthos. This study used a survey method consisting of 3 stations with 3 transects in each station. The organic matter content of sediments revolved from 4.85 to 8.52% in the waters of the southern part of Bengkalis Island. The highest organic matter content was at station III, namely 8.52%, while the lowest organic matter content was at station II namely 4.85%. The abundance of organisms found at the three research stations was 4.04 to 5.96 ind/m2. The abundance average at all macrozoobenthic research stations was 4.93 ind/m2. The results of simple linear regression analysis of organic matter content and abundance of macrozoobenthos showed a very weak correlation

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