scholarly journals Distribution of White-to-White Corneal Diameter and Anterior Chamber Depth in Chinese Myopic Patients

2021 ◽  
Vol 8 ◽  
Author(s):  
Guihua Xu ◽  
Guanrong Wu ◽  
Zijing Du ◽  
Shanqing Zhu ◽  
Yunxiang Guo ◽  
...  
Keyword(s):  
Anterior Chamber ◽  
Age Groups ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Distribution Patterns ◽  
Normal Range ◽  
Cross Sectional ◽  
Significant Difference ◽  
Study Population ◽  
Corneal Diameter

Purpose: To investigate the distribution of white-to-white (WTW) corneal diameter and anterior chamber depth (ACD) in Chinese myopia patients.Methods: This was a cross-sectional observational study conducted at five ophthalmic centers. Anterior segment biometry was performed in 7,893 eyes of the 7,893 myopic patients using Pentacam, and the WTW and ACD were recorded. The distribution patterns of WTW and ACD were evaluated and the correlation between WTW and ACD was analyzed statistically.Results: There were 4416 (55.95%) males and 3477 (44.05%) females. The age of the study population was 25.14 ± 5.41 years. Distribution of WTW was slightly positively skewed (Skewness = 0.0076, Kurtosis = 0.3944, KS P = 0.020) with a mean of 11.65 ± 0.38 mm and a 95% normal range of 10.91–12.39 mm. A significant difference in WTW was found among different myopia groups (P < 0.001). The ACD was normally distributed (Skewness = 0.899, Kurtosis = 0.027, KS P = 0.086). The mean ACD was 3.25 ± 0.26 mm and the 95% normal range of was 2.74–3.75 mm. A significant difference in ACD was also found among different myopia groups (P = 0.030). There was a significant correlation between WTW and ACD (r = 0.460, P < 0.001).Conclusions: In our study, 95% of the Chinese myopic patients had a WTW within 10.91–12.39 mm and an ACD within 2.74–3.75 mm. ACD and WTW were significantly different among different myopia, gender and age groups. WTW was positively correlated with ACD.

scholarly journals Short-Term Effects of Two Types of Goggles On Intraocular Pressure and Anterior Eye Segment Biometrics

2021 ◽  
Author(s):  
Xu Zhang ◽  
Huixian Wang ◽  
Yuan Nie ◽  
Wenjing Li
Keyword(s):  
Intraocular Pressure ◽  
Anterior Chamber ◽  
Corneal Thickness ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Chamber Volume ◽  
Significant Difference ◽  
Anterior Eye Segment

Abstract Background: To evaluate and compare the changes in intraocular pressure and anterior eye segment biometrics,during and after wearing two types of commonly used swimming goggles.Methods: In a cross-sectional study, a total of 40 healthy adults aged between 18 and 60 years old were selected to wear two kinds of common swimming goggles (ocular socket and orbital goggles). Intraocular pressure and anterior segment biometry were evaluated before wearing, at 2 and 5 minutes of wearing, and at 5 minutes after removing the goggles. Intraocular pressure (IOP), corneal front keratometry values (K1, K2, Km), central corneal thickness (CCT), central anterior chamber depth (ACD), anterior chamber volume (ACV), and anterior chamber angle (ACA) were measured.Results: The IOP at 2 minutes (21.0±2.2 mmHg) and 5 minutes (21.2±2.3 mmHg) was significantly higher than before wearing goggles (17.7± 2.1 mmHg). The IOP after the goggles were removed and at 5 minutes after the goggles were removed was 18.4±2.3 mmHg and 17.7±2.1 mmHg, respectively. ACV, ACD, and ACA values all decreased while the googles were worn. After the goggles were removed, these changes gradually returned to baseline values, with no significant difference in the values before and after.Conclusion: This study proves that wearing orbital goggles can lead to an acute increase in IOP and a slight decrease in ACV, ACD, and ACA. However, once the goggles are removed, these indicators return to baseline levels, showing that wearing orbital goggles has no significant lasting effect on IOP and anterior segment parameters.

scholarly journals Anatomical and Visual Effects of Implantable Phakic Contact Lens on Correction of Myopia

2022 ◽  
Author(s):  
Mahmoud Ekram ◽  
Ahmed Mohamed Kamal Elshafei ◽  
Asmaa Anwar Mohamed ◽  
Mohamed Farouk Sayed Othman Abdelkader
Keyword(s):  
Visual Acuity ◽  
Anterior Chamber ◽  
Contact Lens ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Case Series ◽  
Care Group ◽  
Case Series Study ◽  
Significant Difference ◽  
The Mean

Abstract Purpose: To evaluate the anatomical effects of implantable phakic contact lens (IPCL) (Care Group, India) on anterior segment and its visual outcomes .Patients and methods: In a prospective interventional case series study, 60 highly myopic eyes of 32 patients were subjected to IPCL implantation in the Ophthalmology Department of Minia University Hospital, Egypt from January 2019 to June 2021. All patients had complete ophthalmic examination and were followed up for 1 year. Pentacam was used for preoperative and postoperative estimation of anterior chamber depth (ACD), anterior chamber angle (ACA), anterior chamber volume (ACV) and IPCL vault in the 1st, 3rd, and 12th months. Assessment of corneal endothelium was done using specular microscope preoperatively and after 12 months. Preoperative and postoperative refraction and visual acuity were measured. Results: There was a statistically significant decrease in ACD, ACA, and ACV. There was no significant difference between preoperative and postoperative mean intraocular pressure (IOP) by the 12th month (P=0.163). The mean preoperative endothelial cell count (ECD) was significantly reduced from 2929.3±248 cells/mm2 to 2737.9±303 cells/mm2 at the 12th month (P<0.001). with a statistically highly significant improvement of mean Log Mar uncorrected visual acuity (UCVA) from 1.48±0.19 preoperatively to 0.46±0.11 by the end of follow up (P<0.001) with insignificant difference between preoperative best corrected visual acuity (BCVA) and postoperative UCVA (P=0.209). In the 12th month, the mean vault was 240±540 μm. No sight threatening complications occurred.Conclusion: Although IPCL induced anatomical changes, it was safe and effective for correction of high myopia.

scholarly journals Evaluation of Anterior Segment’s Structures in Tilted Disc Syndrome

2016 ◽  
Vol 2016 ◽  
pp. 1-4 ◽  
Author(s):  
Ercan Ozsoy ◽  
Abuzer Gunduz ◽  
Ersin Ersan Demirel ◽  
Tongabay Cumurcu
Keyword(s):  
Anterior Chamber ◽  
Axial Length ◽  
Corneal Thickness ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Control Group ◽  
Tilted Disc Syndrome ◽  
Chamber Volume ◽  
Significant Difference ◽  
Tilted Disc

Purpose. To evaluate anterior segment’s structures by Pentacam in patients with tilted disc syndrome (TDS).Methods. Group 1 included forty-six eyes of forty-six patients who have the TDS. Group 2 including forty-six eyes of forty-six cases was the control group which was equal to the study group in age, gender, and refraction. A complete ophthalmic examination was performed in both groups. All cases were evaluated by Pentacam. The axial length (AL) of eyes was measured by ultrasound. Quantitative data obtained from these measurements were compared between two groups.Results. There was no statistically significant difference for age, gender, axial length, and spherical equivalent measurements between two groups (p=0.625,p=0.830,p=0.234, andp=0.850). There was a statistically significant difference for central corneal thickness (CCT), corneal volume (CV), anterior chamber angle (ACA), and pupil size measurements between two groups (p=0.001,p=0.0001,p=0.003, andp=0.001). Also, there was no statistically significant difference for anterior chamber depth (ACD), anterior chamber volume (ACV), and lens thickness (LT) measurements between two groups (p=0.130,p=0.910, andp=0.057).Conclusion. We determined that CCT was thinner, CV was less, and ACA was narrower in patients with TDS. There are some changes in the anterior segment of the eyes with tilted disc.

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 &gt; 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 &lt; 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 &lt; 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 &gt; 0.05). In patients with an anterior chamber depth &gt;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 &lt; 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 &lt; 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 Haemoglobin Level in Children of a Northern District of Bangladesh

2012 ◽  
Vol 30 (3) ◽  
pp. 127-131
Author(s):  
M N Absar
Keyword(s):  
Haemoglobin Level ◽  
Parental Education ◽  
Age Groups ◽  
Reference Value ◽  
Outpatient Department ◽  
Haematological Parameters ◽  
Reference Level ◽  
Cross Sectional ◽  
Significant Difference ◽  
Study Population

Objective: To find out the reference level of haemoglobin and other haematological parameters(PCV, MCV, MCH, MCHC, S. Iron and S. Ferritin) of the children of Northern area of Bangladesh and to see the relation of socio demographic features and other haematological parameters with haemoglobin level.Methodology: Observational cross sectional study.Setting: Outpatient department of Rangpur Medical College and outpatient department of eight Upozilla Health Complexes of northern Bangladesh.Patients: 300 clinically healthy 1yr. to 14yr. age children.Outcome measures: Mean Hb. level in age groups and influence of sex, age, economic status, parental education, nutrition and serum iron on level of Hb. PCV, MCV, MCH, MCHC, S. Iron and S. Ferritin was estimated to see the confounders and if they are affecting Hb. level significantly.Results: Mean haemoglobin among study population was 11.4gm/dl(SD;1.07). Haemoglobin was normally distributed among the study population. Mean haemoglobin among age groups differed significantly. No significant difference in mean haemoglobin was observed among two sex groups. Mean haemoglibin level corresponded well with WHO defined haemoglobin level in the same age group of children.Conclusion: Reference level of mean Hb. in the studied population is 11.4gm/dl(SD;1.07). Age affects the Hb. level but sex does’t. Hb. level in this population is comparable with WHO reference value for this age. DOI: http://dx.doi.org/10.3329/jbcps.v30i3.12460 J Bangladesh Coll Phys Surg 2012; 30: 127-131

scholarly journals Comparative Study of the Effects of 1% Atropine on the Anterior Segment

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Yue Zhou ◽  
Xiao Bo Huang ◽  
Qi Cai ◽  
Jun Jie Li ◽  
Yao Jia Xiong ◽  
...  
Keyword(s):  
Anterior Chamber ◽  
Univariate Analysis ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Muscle Thickness ◽  
Ultrasound Biomicroscopy ◽  
Cross Sectional ◽  
Ciliary Process ◽  
Before And After ◽  
Anterior Segment Parameters

Purpose. To investigate the influences of atropine on changes in anterior segment geometry, as measured by ultrasound biomicroscopy in children. Methods. A prospective observational study was performed. Anterior segment parameters were obtained by UBM before and after the instillation of 1% atropine. Univariate linear regression was performed to identify the variables contributing to the changes in the trabecular meshwork-iris angle (TIA). Results. The study included 21 boys and 37 girls with a mean age of 10.79 ± 2.53 years. Anterior chamber parameters including the central anterior chamber depth, TIA, angle opening distance at 500 μm from the scleral spur, iris thickness 750 μm and 1500 μm from the scleral spur, trabecular-ciliary angle (TCA), trabecular-ciliary process distance, sclera-iris angle (SIA), and sclera-ciliary process angle significantly increased after cycloplegia ( P < 0.05 ). In contrast, the lens vault, iris cross-sectional area, and maximum ciliary muscle thickness significantly decreased after cycloplegia. Univariate analysis identified the change in TCA and the change in SIA and the TIA before mydriasis as determinants of the change in TIA. Conclusions. Atropine causes statistically significant changes in various anterior segment parameters in children. The change in anterior chamber angle is associated with the change in TCA and the change in SIA and the TIA before mydriasis.

Quantification of Trabecular-Iris Contact and its Prevalence by Optical Coherence Tomography in a Healthy Caucasian Population

2016 ◽  
Vol 27 (4) ◽  
pp. 417-422 ◽  
Author(s):  
José Ignacio Fernández-Vigo ◽  
Lucía De-Pablo-Gómez-De-Liaño ◽  
Cristina Fernández-Vigo ◽  
Inés Sánchez-Guillén ◽  
Enrique Santos-Bueso ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Chamber ◽  
Refractive Error ◽  
Axial Length ◽  
Corneal Thickness ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Fourier Domain ◽  
Optical Coherence ◽  
Cross Sectional

Purpose To determine the prevalence of trabecular-iris contact (TIC) and quantify this contact in healthy Caucasian individuals using Fourier-domain optical coherence tomography (FD-OCT). Methods For this cross-sectional study, 2,012 eyes of 1,006 healthy subjects were recruited among individuals undergoing a routine ophthalmologic checkup. In each participant, age, sex, intraocular pressure, and spherical refractive error were first recorded along with anterior chamber depth and volume, central corneal thickness measured with the Pentacam, and axial length with the IOLMaster. Anterior chamber angle variables and the presence of TIC in the horizontal quadrants were determined by anterior segment FD-OCT (RTVue 100®). When TIC was observed, TIC length (TICL) and its percentage in relation to the length of the trabecular meshwork (TICL percentage) were also measured. Results Trabecular-iris contact in the horizontal quadrants was observed in 34 eyes of 25 patients, representing 1.6% of the total number of eyes examined. In this subgroup of individuals, mean age was 55.8 years, 84% were women, and spherical refractive error ranged from -0.25 to 8.25 D. Eyes with TIC showed an angle width of less than 23.2 degrees and axial length shorter than 23.7 mm. Mean TICL was 239 ± 79 μm (103-495 μm) and mean TICL percentage was 46.9% ± 13.9% (17.2%-76.3%). Conclusions The prevalence of TIC was low in this population. Fourier-domain optical coherence tomography emerged as useful to assess its prevalence and quantify the extent of TIC.

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 Effect of axial length and anterior chamber depth on the peripheral refraction profile

2021 ◽  
Vol 14 (2) ◽  
pp. 292-298
Author(s):  
Masoud Khorrami-Nejad ◽  
◽  
Alireza Akbarzadeh Baghban ◽  
Bahram Khosravi ◽  
◽  
...  
Keyword(s):  
Anterior Chamber ◽  
Refractive Error ◽  
Axial Length ◽  
Anterior Chamber Depth ◽  
Group Versus ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Normal Range ◽  
Cross Sectional ◽  
The Mean

AIM: To evaluate the effect of axial length (AL) and anterior chamber depth (ACD) on peripheral refractive profile in myopic patients compared to emmetropic participants. METHODS: This cross-sectional study was conducted in right eyes of 58 participants of whom 38 were emmetropic and 20 were myopic. Central and peripheral refraction were measured at 10°, 20°, and 30° eccentricities in nasal and temporal fields using an open-field autorefractor. The Lenstar LS900 was used to measure ACD and AL. The participants were divided into three groups of short (<22.5 mm), normal (22.5-24.5 mm), and long eye (>24.5 mm) according to AL and three groups of low ACD (<3.00 mm), normal ACD (3.00-3.60 mm), and high ACD (>3.60 mm) according to ACD. RESULTS: The mean age of the participants was 22.26±3.09y (range 18-30y). The peripheral mean spherical refractive error showed a hypermetropic shift in myopic and emmetropic groups although this shift was more pronounced in the myopic group. The results showed significant changes in the spherical equivalent, J0, and J45 astigmatism in all gazes with an increase in eccentricity (P<0.001). The pattern of refractive error changes was more noticeable in long and short eyes versus normal AL eyes. Moreover, the pattern of peripheral refractive changes was much more prominent in the high ACD group versus the normal ACD group and in the normal ACD group versus the low ACD group. CONCLUSION: Peripheral refraction changes are greater in participants with AL values outside the normal range and deeper ACD values compared to participants with normal AL and ACD.

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