Effect of a Suction Device for Femtosecond Laser on Anterior Chamber Depth and Crystalline Lens Position Measured by OCT

2009 ◽  
Vol 25 (11) ◽  
pp. 1005-1011 ◽  
Author(s):  
Kathleen S. Kunert ◽  
Marcus Blum ◽  
Matthias Reich ◽  
Manfred Dick ◽  
Christoph Russmann
Keyword(s):  
Femtosecond Laser ◽  
Anterior Chamber ◽  
Anterior Chamber Depth ◽  
Crystalline Lens ◽  
Suction Device ◽  
Lens Position

scholarly journals Repeatability and reproducibility of axial length, anterior chamber depth and crystalline lens thickness measurements using the Nidek US-500 Echoscan

2015 ◽  
Vol 74 (1) ◽  
Author(s):  
Khathutshelo P. Mashige
Keyword(s):  
Anterior Chamber ◽  
Axial Length ◽  
Repeated Measures ◽  
Anterior Chamber Depth ◽  
Correlation Coefficients ◽  
Crystalline Lens ◽  
Angle Closure ◽  
Lens Thickness ◽  
Primary Angle Closure Glaucoma ◽  
The Right

Aim: The reliability of an instrument used to collect data for clinical and research purposes is greatly important, especially when it is used to determine changes in measured ocular parameters over time. The purpose of this study was to determine the intra-session repeatability and inter-session reproducibility of axial length (AL), anterior chamber depth (ACD) and crystalline lens thickness (LT) measurements using the Nidek US-500 Echoscan.Method: Fifty successive automatic measurements of the above parameters were taken on the right eyes only of 12 healthy subjects aged 23–44 years old, followed by similar repeated measures after 1 week. Sample standard deviations (s.d.), precision (P) and coefficient of repeatability (COR) were calculated to determine intra-session repeatability. Coefficient of reproducibility (CRP), Bland and Altman plots, concordance correlation coefficients (CCC) and paired t-tests that compared measurements obtained in the first and second sessions, were used to determine inter-session reproducibility.Results: Both the intra-session repeatability and inter-session reproducibility were within acceptable limits for the three variables assessed.Conclusion: The study showed that the Nidek US-500 Echoscan provides accurate, repeatable and reproducible measurements of AL, ACD and LT in healthy eyes. This finding will be of interest to optometrists and ophthalmologists who measure these parameters when diagnosing, managing and investigating conditions such as primary angle-closure glaucoma and keratoconus.

scholarly journals Parameters of Capsulorrhexis and Intraocular Lens Decentration After Femtosecond and Manual Capsulotomies in High Myopic Patients With Cataracts

2021 ◽  
Vol 8 ◽  
Author(s):  
Yanan Zhu ◽  
Kexin Shi ◽  
Ke Yao ◽  
Yuyan Wang ◽  
Sifan Zheng ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Anterior Chamber ◽  
Intraocular Lens ◽  
Intraoperative Complications ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Rank Correlation ◽  
Chi Square ◽  
Significant Difference ◽  
Intraocular Lens Decentration

Purpose: To compare the parameters of capsulorrhexis and intraocular lens decentration after femtosecond laser capsulotomy and manual continuous curvilinear capsulorrhexis in high myopic patients with cataracts.Methods: This is a prospective consecutive non-randomized comparative cohort study. Selected patients with axial length > 26.0 mm were divided into femtosecond laser capsulotomy (FS) group and manual continuous curvilinear capsulorrhexis (CCC) group. Five experienced phacoemulsification surgeons conducted all surgeries. Intraoperative complications and post-operative anterior segment photography were recorded. Intraocular lens decentration, area of capsulorrhexis, circularity, and capsule overlap were measured at 1 week, 1 month, and 2 years after surgery. Between group differences of parameters were determined with independent-sample t-test or the Mann–Whitney U-test, analysis of variance test, Pearson chi-square test, and Spearman rank correlation test.Results: The study included 142 eyes (108 patients), 68 eyes in the FS group, and 74 eyes in the CCC group. At 1 week, 1 month, and 2 years after surgery, the area of capsulorrhexis in the CCC group was significantly larger than in the FS group (P < 0.05), while no significant difference was noted in circularity values. The complete overlap ratio in the FS group was significantly higher than that in the CCC group (P < 0.05) at each measured timepoint. Significant correlations were noted between the anterior chamber depth and the area of capsulorrhexis in the CCC group (R = 0.25, P = 0.04), but did not correlate in the FS group (P > 0.05). In patients with an anterior chamber depth >3 mm, the capsule-intraocular lens (IOL) overlap of the CCC group was less than that of the FS group at all measured timepoints after surgery (P < 0.05). Meanwhile, the IOL decentration in the CCC group was significantly greater than that of the FS group in those patients at 2 years after surgery (P < 0.05).Conclusion: In high myopic patients with cataracts, with anterior chamber depth more than 3 mm, femtosecond laser capsulotomy can achieve better capsulorrhexis sizing and centering. Due to more precise capsulotomy and a better capsule-IOL overlap in the FS group, femtosecond laser capsulotomy resulted in better long-term centration of the IOL.

scholarly journals Biometric indicators of Eyes with Occult Lens Subluxation inducing Secondary Acute Angle Closure

2019 ◽  
Author(s):  
Xiaoli Xing ◽  
Liangyu Huang ◽  
Fang Tian ◽  
Yan Zhang ◽  
Yingjuan Lv ◽  
...  
Keyword(s):  
Anterior Chamber ◽  
Axial Length ◽  
Anterior Chamber Depth ◽  
Acute Angle ◽  
Angle Closure ◽  
Lens Subluxation ◽  
Lens Thickness ◽  
Primary Angle Closure ◽  
Lens Position ◽  
Acute Angle Closure

Abstract Background : To compare the anterior biometricsof eyes with secondary acute angle closure induced by occult lens subluxation (ASAC-LS), which were misdiagnosed at the first visit withacute primary angle closure (APAC), chronic primary angle closure glaucoma (CPACG), or cataracts. Methods: This retrospective case series ncluded 17 eyes with angle closure due to occult LS which were misdiagnosed with APAC at the first visit, 56 APACeyes, 54 CPACGeyes, and 56 cataracteyes. The axial length (AL), central corneal thickness (CCT), anterior chamber depth (ACD), aqueous depth (AD), and lens thickness (LT) were recorded. The lens position (LP), relative lens position (RLP), and corrected lens position (CLP) were calculated. Quantitative data were subject to a one-way analysis of variance and correlation analysis. Categorical data were analysed using the chi-squared test. Receiver operating characteristic (ROC) curves were plotted to obtain a suitable cut-off value for ocular biometrics. Results: The ASAC-LSpatients had a longer ocular AL than the APACand CPACGpatients. The CCTinthe ASAC-LS patientsdid not significantly differ from that in the APAC patientsbut did significantly differ from that of the CPACG and cataract patients.The APAC patientshad the smallest ACD, while the ASAC-LS patientshad the smallest AD. The ASAC-LS patientshad the thickest lenses. According to the ROC curve analysis, the RLP, ACD, AD, CLP, and LP hada high power of discrimination. Conclusions: This study revealed that ASAC-LS patients had a shallower AD and thicker CCT compared to APAC, CPACG, and cataract patients. Biometric parameters ACD, ADwere characteristic of lens subluxation according to our data. The calculated parameters RLP,CLP, LP can be helpful in the differential diagnosis between ASAC-LSand APAC, CPACG, Cataract. Trial registration: NCT03752710, retrospectively registered. Keywords:Lens subluxation; Acute angle-closure; Biometry; Anterior chamber depth; Lens thickness; Axial length

scholarly journals Impact of Pseudoexfoliative Syndrome on Effective Lens Position, Anterior Chamber Depth Changes, and Visual Outcome After Cataract Surgery

2021 ◽  
Vol Volume 15 ◽  
pp. 2867-2873
Author(s):  
Michael Müller ◽  
Katarzyna Pawlowicz ◽  
Myriam Böhm ◽  
Eva Hemkeppler ◽  
Christoph Lwowski ◽  
...  
Keyword(s):  
Cataract Surgery ◽  
Anterior Chamber ◽  
Anterior Chamber Depth ◽  
Visual Outcome ◽  
Lens Position

scholarly journals Comparison of Femtosecond Laser-Assisted Cataract Surgery and Conventional Phacoemulsification in Shallow Anterior Chambers and Glaucoma

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Zhou Zhou ◽  
Li Li ◽  
Siming Zeng ◽  
Wenjing He ◽  
Min Li
Keyword(s):  
Endothelial Cell ◽  
Femtosecond Laser ◽  
Cataract Surgery ◽  
Anterior Chamber ◽  
Anterior Chamber Depth ◽  
Cell Loss ◽  
Capsular Tension Ring ◽  
Complicated Cataract ◽  
Corrected Distance Visual Acuity ◽  
Shallow Anterior Chamber

Purpose. To compare femtosecond laser-assisted cataract surgery (FLACS) versus conventional phacoemulsification in shallow anterior chamber cataract patients with glaucoma or zonulysis. Methods. This was a single-center retrospective review of cataract surgeries in shallow anterior chamber and glaucoma patients between January 2016 and December 2018 in which a LenSx femtosecond laser was used. The outcome measures included pre- and postoperative uncorrected and corrected distance visual acuity (UDVA and CDVA), intraocular pressure (IOP), endothelial cell density (ECD), endothelial cell loss (ECL), and object scatter index (OSI). Results. One hundred and six eyes of 106 patients with a mean anterior chamber depth of 1.54 ± 0.51 mm were included in this study. Among them, 26 (23.2%) had zonulysis and 18 eyes had capsular tension ring implantation in general. The percentage of capsular tension ring implantation was statistically significantly lower in the FLACS group ( P  = 0.027). The UDVA, CDVA, ECD, and IOP were not statistically significant between the two groups at all time points. The postoperative ECL and OSI of the FLACS group was better than those of the conventional group ( P  < 0.01). Conclusions. FLACS can reduce ECL and improve visual quality compared to the conventional phacoemulsification in shallow anterior chamber patients. Also, it has the trend of reducing the use of capsular tension rings in subluxated cataracts. It is an ideal choice for patients with complicated cataract such as with shallow anterior chambers, glaucoma, and zonulysis.

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 Correlation between Axial Length and Anterior Chamber Depth in Eyes with High, Low and Average Axial Length

QJM ◽  
2020 ◽  
Vol 113 (Supplement_1) ◽  
Author(s):  
J H F Aziz ◽  
R M F Elghazawy ◽  
A I Elawamry ◽  
R G Zaki
Keyword(s):  
Anterior Chamber ◽  
Axial Length ◽  
Anterior Chamber Depth ◽  
Power Calculation ◽  
University Hospitals ◽  
Corneal Power ◽  
Lens Position ◽  
Study Results ◽  
Iol Power ◽  
Biometric Measurements

Abstract Background To achieve optimal refractive outcomes after cataract surgeries, accurate IOL power calculation is mandatory. IOL power is calculated using preoperative biometric measurements such as AL, corneal power, ACD and an estimation of postoperative effective lens position. Choosing the formula of IOL calculation depends mainly on AL and ACD. Objective The objective of this study is to investigate the correlation between AL and ACD in short eyes, normal eyes and long eyes. Patients and Methods The study was conducted at Ain Shams University Hospitals after the approval of the research ethical committee in the Faculty of Medicine, Ain Shams University. Study Period: 6 months (from July 2018 to January 2019). Results The results of our study showed that the correlation between the axial length and the anterior chamber depth among short eyes was statistically significant and they were negatively correlated, while no statistically significant correlation existed between AL and ACD in normal and long eyes. Discussion IOL power is calculated using preoperative biometric measurements such as AL, corneal power, ACD and an estimation of postoperative effective lens position. In the study by Holladay, 82% had normal AL and only 0.9% of patients had short eyes. Holladay et al. found that among patients with long eyes, 90% have normal ACD, 10% have high ACD and none of them have short ACD. In the group of patients with normal AL, they found that 90% of patients had normal ACD, none of them had low ACD and 10% had high ACD. In patients with short eyes they found that 20% have low ACD, 80% have normal ACD and none of them have high ACD. Sedaghat et al. documented that linear relationship was only seen in patients with normal AL and not in short and long sighted patients. Chang and Lau have concluded in their study that there was no statistically significant correlation between AL and ACD in eyes with AL of 27.5 mm or greater while positive statistically significant correlation existed in eyes shorter than 27.5 mm. Our study included ninety eyes of patients presenting for IOL or phakic lens implantation in Ain Shams University Hospitals. Patients were divided into three groups according to the AL; the short, normal and long eyes with AL ≤ 22 mm, &gt; 22 mm and &lt;24.50 mm and ≥24.50 mm, respectively. AL and ACD of each patient were measured using The ZEISS IOL Master 500. The results shows that the correlation between the axial length and the anterior chamber depth among short eyes is statistically significant and they are negatively correlated (r = -0.458. P value 0.011), while no statistically significant correlation exists between AL and ACD in normal and long eyes, i.e.: when AL &gt; 22 mm. This lack of correlation might influence the ELP predictions in third generation formulas, which do not consider the preoperative ACD. Our study results agree with most of the previous studies regarding long eyes &gt;27.5 mm that there is no statistically significant correlation between AL and ACD. While in short eyes it disagrees with Chang and Lau who concluded that there was no statistically significant correlation in short eyes and Sedaghat et al. who showed positive correlation between AL and ACD in short eyes. Our study results disagrees with most of the previous studies regarding normal eyes showing that there is no statistically significant correlation between AL and ACD in normal eyes, while previous studies concluded that a positive linear correlation exists. Conclusion The AL and ACD are inversely related in short eyes with AL ≤ 22 mm while no correlation exists in normal and long eyes with AL &gt; 22 mm.

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