scholarly journals Analysis of corneal astigmatism and aberration in chinese congenital cataract and developmental cataract patients before cataract surgery

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Xiaoyan Han ◽  
Qi Fan ◽  
Zhixiang Hua ◽  
Xiaodi Qiu ◽  
Dongjin Qian ◽  
...  
Keyword(s):  
Cataract Surgery ◽  
Congenital Cataract ◽  
Anterior Chamber Depth ◽  
Corneal Astigmatism ◽  
Imaging Device ◽  
Mean Values ◽  
Biometric Parameters ◽  
Developmental Cataract ◽  
Positive Linear Correlation ◽  
Cataract Patients

Abstract Background To investigate the distribution of corneal astigmatism, aberration, and biometric parameters in Chinese congenital cataract (CC) /developmental cataract patients before cataract surgery. Methods We evaluated eyes of CC /developmental cataract patients scheduled for cataract surgery from January 2016 to September 2019. Astigmatism, aberrations, and biometric parameters were measured with the Pentacam Scheimpflug imaging device (Pentacam HR, Oculus). Cataract was diagnosed and classified by slit-lamp examination after full mydriasis. Results We evaluated 538 eyes in 356 patients. The mean values of anterior corneal astigmatism (ACA), posterior corneal astigmatism (PCA), and total corneal astigmatism (TCA) were determined as 1.98 ± 1.06 D (range 0.0‒4.8 D), 0.49 ± 0.26 D (range 0.0‒1.9 D), and 2.09 ± 1.19 D (range 0.2‒8.8 D), respectively. ACA and TCA ≥ 1.25 D was present in 379 eyes (70.3%) and 392 eyes (72.8%), respectively. PCA between 0.25 D and 0.75 D was found in 380 eyes (70.6%). There was a statistically significant positive linear correlation between lower-order aberrations root mean square values (LOA RMS) and corneal astigmatism (CA). Furthermore, in terms of distribution of central cornea thickness, anterior chamber depth, ACA, PCA, and TCA in different types of cataracts, ACA was highest in patients with zonular cataracts. Finally, we found anterior corneal measurements may overestimate WTR astigmatism, underestimate ATR astigmatism, and underestimate oblique astigmatism, respectively. Conclusions Most CC /developmental cataract patients had moderate to high astigmatism and ACA accounted for the largest proportion in the zonular group. This can provide a basis for planning of CC/developmental cataract surgery by ophthalmologists in clinical practice.

scholarly journals Evaluation of Anterior Chamber Depth in 28,709 Adult Cataract Patients in China using Swept-Source Optical Biometry

2021 ◽  
Author(s):  
Qiong Lei ◽  
Haixia Tu ◽  
Xi Feng ◽  
Yong Wang
Keyword(s):  
Cataract Surgery ◽  
Anterior Chamber ◽  
Axial Length ◽  
Corneal Thickness ◽  
Anterior Chamber Depth ◽  
Multivariate Regression Analysis ◽  
Swept Source ◽  
Mean Values ◽  
The Mean ◽  
Cataract Patients

Abstract Background: To create an anterior chamber depth (ACD) regression model for adult cataract surgery candidates from China, and to evaluate the distribution of their ocular biometric parameters.Methods: The ocular biometric records of 28,709 right eyes of cataract surgery candidates who were treated at Aier Eye Hospitals in nine cities from 2018 to 2019 were retrospectively analyzed. All measurements were taken with IOLMaster 700. We included patients who were at least 40 years old and were diagnosed with cataract.Results: The mean age of the patients was 68.6 ± 11.0 years. The mean values recorded were as follows: axial length (AL), 24.17 ± 2.47 mm; mean keratometry (Km) value, 44.09 ± 3.25 D; corneal astigmatism (CA), 1.06 ± 0.98 D; ACD, 3.02 ± 0.45 mm; lens thickness (LT), 4.52 ± 0.45 mm; central corneal thickness (CCT), 0.534 ± 0.04 mm; and white to white (WTW) corneal diameter, 11.64 ± 0.46 mm. The proportion of patients with long axial length (AL >25 mm) decreased with age. ACD, LT, AL, Km, WTW, and age were correlated. In the multivariate regression analysis of ACD, which included LT, AL, WTW, sex, Km, CCT, and age, there was a reasonable prediction with adjusted R2 = 0.629.Conclusions: The results show that high myopes are inclined to schedule cataract surgery at a younger age. LT and AL were found to be important factors that affect ACD. This study provides reference data for cataract patients from China.

scholarly journals Ocular Biometry and Corneal Astigmatism in Patients Undergoing Cataract Surgery in Bheri Zone of Nepal

2017 ◽  
Vol 15 (2) ◽  
pp. 53-57
Author(s):  
Bikram Bahadur Thapa ◽  
Y. Dhakal ◽  
J. K. Verma ◽  
P. Manandhar
Keyword(s):  
Cataract Surgery ◽  
Anterior Chamber ◽  
Axial Length ◽  
Anterior Chamber Depth ◽  
College Teaching ◽  
Visual Outcome ◽  
Corneal Astigmatism ◽  
Medical College ◽  
The Mean ◽  
Cataract Patients

 Introduction: Accurate measurement of ocular axial length, keratometry and anterior chamber depth before cataract surgery is crucial for calculating the power of intraocular lens (IOL) to be implanted. Corneal astigmatism is one of the major thefts to have best postoperative unaided visual acuity. Thus, knowing it preoperatively and taking appropriate intervention during surgery provides best postoperative visual outcome. But there are no studies on corneal astigmatism and biometric parameters in the population of Bheri Zone. MATERIAL AND METHOD: The medical records of the patients who had  ndergone cataract surgery between January 2017 and November 2017 at Nepalgunj medical college were retrospectively reviewed and analyzed. Patient's demographic parameter, keratometric value, anterior chamber depth, lens thickness and axial length data were collected and analyzed. RESULTS: This study evaluated the data in 65 eyes of 65 patients who had undergone cataract surgery. The mean age of patients was 59.3 ± 15.71 years. The mean corneal astigmatism was 1.37 D ±1.4D (range 0.00-6.75D). Corneal astigmatism was higher than 1.00 D in 32.3% of cases. The mean average keratometry was 44.54±1.83D. The magnitude of corneal astigmatism was positively correlated with age (p<0. 001) and there was a tendency for corneal astigmatism to increase with age above 50 years. Against-the-rule regular astigmatism was the most common type (46.2%) of astigmatism observed in this study. CONCLUSION: The present report showed the pattern of corneal astigmatism before cataract surgery in the patients at Nepalgunj Medical College Teaching Hospital. One third of cataract patients had corneal astigmatism of more than 1.0D. This finding provide the important normative reference and help ophthalmologists to plan and manage the cost-effective correction of preexisting corneal astigmatism in cataract patients to achieve the best visual outcome.

scholarly journals Axial ocular dimensions and corneal astigmatism: The Kuala Pilah Cluster Cataract Study

2019 ◽  
Vol 1 (3) ◽  
pp. 160-169
Author(s):  
Puspha Raman ◽  
Nur Hanis Yusri ◽  
Syed Alsagoff Ahmed Daiyallah ◽  
Premala Devi Sivagurunathan ◽  
Khairul Husnaini Mohd Khalid
Keyword(s):  
Cataract Surgery ◽  
Local Population ◽  
Anterior Chamber Depth ◽  
Cross Sectional Study ◽  
Corneal Astigmatism ◽  
Biometric Data ◽  
Cross Sectional ◽  
Hospital System ◽  
Mean Values ◽  
District Hospitals

Introduction: The Kuala Pilah Cluster Project involves Kuala Pilah Hospital as the lead hospital and the Jempol Hospital and Tampin Hospital as the district hospitals, serving as a single entity to provide ophthalmology services to the local population. Purpose: To evaluate the distribution of ocular biometric parameters and corneal astigmatism in patients presenting for cataract surgery within the Kuala Pilah Cluster Hospital System. Study design and methods: A cross-sectional study conducted on 273 consecutive patients presented for cataract surgery between January and June 2017. Ocular biometry measurements, including axial length (AXL), lens thickness (LT), and anterior chamber depth (ACD) of each right eye were measured using immersion A-scan ultrasound. Keratometric (K) readings were obtained via auto keratometer. Results: The mean values for AXL, ACD, and LT were 23.40 ± 0.90 mm, 3.17 ± 0.49 mm, and 4.45 ± 0.96 mm, respectively. The average K-reading was 44.40 ± 1.59 D, with a mean corneal astigmatism of 0.82 ± 0.62 D. In this population, the females have significantly shorter AXL and ACD, but steeper K compared to the males (P < 0.001). The local Malays have higher AXL and ACD values compared to the Chinese and Indians. A total of 35.5% patients exhibited a corneal astigmatism greater than 1 D. The magnitude of preoperative astigmatism positively correlated with age (P < 0.001). Conclusions: Ocular dimensions vary with gender and race in cataract patients from the Kuala Pilah cluster population. The probability of a patient requiring astigmatic correction increases with age. The average profile of ocular biometric data and corneal astigmatism may help local ophthalmologists to predict intraocular lens selections prior to cataract outreach projects.

scholarly journals Influence of anterior chamber depth on postoperative refractive outcome in Chinese eyes

2018 ◽  
Vol 16 (2) ◽  
pp. 79-85
Author(s):  
Rachel SH Wong ◽  
Keith Ong
Keyword(s):  
Cataract Surgery ◽  
Anterior Chamber ◽  
Anterior Chamber Depth ◽  
Demographic Variables ◽  
Refractive Outcomes ◽  
Positive Linear Correlation ◽  
The Mean ◽  
The Difference ◽  
Linear Correlations ◽  
Refractive Surprise

Aim or Purpose: This study aims to evaluate the refractive surprise (RS) after cataract surgery with various intraocular lens (IOL) formulas in eyes with very shallow or deep anterior chamber depth (ACD). Design: This is a prospective cohort study of patients from a private ophthalmology practice in Sydney. Methods: Thirty-one patients who had their cataract surgery in 2014 were included. The cohort consists of 20 eyes with ACD < 2.8 mm and 25 eyes with ACD > 3.2 mm. Patients’ demographic variables and their predicted refractive outcomes using the SRK-T, Haigis, Holladay 1, and Holladay 2 IOL formulas were collected. Actual refractive outcomes were obtained from consultations at least one-month postoperatively. RS was calculated from the difference between predicted refraction outcome of IOL formulas and the actual postoperative refraction achieved. Results: The linear correlations between ACD and RS were not significant (p > 0.05). In the group with ACD < 2.8 mm, the mean refractive surprise using SRK-T, Haigis, Holladay 1, and Holladay 2 formulas were -0.191 ± 0.541, -0.189 ± 0.444, -0.201 ± 0.449, and -0.154 ± 0.489 D, respectively. In the group with ACD > 3.2 mm, the mean refractive surprise using the IOL formulas were -1.364 ± 0.541, -1.420 ± 0.541, 0.027 ± 0.394, and -0.045 ± 0.343 D, respectively.  Conclusion: The positive linear correlation between ACD and RS was weak. In eyes with ACD < 2.8 mm, the least RS was found with the Holladay 2 formula, while in eyes with ACD > 3.2 mm, this was found with Holladay 1.

The Influence of Congenital Cataract Surgery on the Ocular Surface in a Six-Month Follow-Up Prospective Clinical Study

2021 ◽  
Author(s):  
Xiaolei Lin ◽  
Hongzhe Li ◽  
Xiyue Zhou ◽  
Xin Liu ◽  
Fan Fan ◽  
...  
Keyword(s):  
Cataract Surgery ◽  
Congenital Cataract ◽  
Tear Film ◽  
Meibomian Gland ◽  
Non Invasive ◽  
Break Up ◽  
Gland Function ◽  
Normal Controls ◽  
Cataract Patients ◽  
Congenital Cataract Surgery

Abstract Background: The purpose of this study was to identify changes in tear film function and meibomian gland function in children after congenital cataract surgery.Methods: This study enrolled 21 eyes of 16 congenital cataract patients (mean age: 8.05±1.43 years) who underwent cataract surgery and 16 eyes of 16 normal volunteers (mean age: 8.31±2.18 years). Clinical assessments were conducted preoperatively and at 1 week, 1 month, 3 months and 6 months postoperatively. Symptom questionnaires, non-invasive tear film break-up time, tear meniscus height, corneal fluorescein staining, lid margin abnormality, meibomian gland expressibility, and meibography were assessed.Results: The ocular symptom score was significantly higher in congenital cataract patients compared to normal controls during the 5 visits (P=0.009). And the average non-invasive tear film break-up time was significantly lower in congenital cataract patients compared to normal controls (P=0.017). The first non-invasive tear film break-up time and average non-invasive tear film break-up time was lowest at 1 month postoperatively compared to baseline levels (P = 0.008 and P = 0.012, respectively). The lid margin score of the upper eyelid was significantly higher in congenital cataract patients compared to normal controls at 1 week postoperatively (P=0.027). The meibum expressibility score decreased significantly during the 5 visits (P=0.024). No significant difference was observed in meibomian gland tortuosity, meibomian gland width, meibomian gland area and meibomian gland length between the congenital group and normal controls preoperatively and at 6 months postoperatively (P>0.05).Conclusion:Tear film stability and meibomian gland function are worsened transiently after congenital cataract surgery without accompanying meibomian gland morphological changes.

scholarly journals Distribution of ocular biometric parameters and optimal model of anterior chamber depth regression in 28,709 adult cataract patients in China using swept‐source optical biometry

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Qiong Lei ◽  
Haixia Tu ◽  
Xi Feng ◽  
Julio Ortega-Usobiaga ◽  
Danmin Cao ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Anterior Chamber ◽  
Multivariate Regression ◽  
Corneal Thickness ◽  
Anterior Chamber Depth ◽  
Multivariate Regression Analysis ◽  
Swept Source ◽  
Biometric Parameters ◽  
The Mean ◽  
Cataract Patients

Abstract Background The purpose of this study was to evaluate the ocular biometric parameters in adult cataract patients from China and create an anterior chamber depth (ACD) regression model. Methods The ocular biometric records of 28,709 right eyes of cataract surgery candidates who were treated at Aier Eye Hospitals in nine cities from 2018 to 2019 were retrospectively analyzed. All measurements were taken with IOLMaster 700. We included patients who were at least 40 years old and were diagnosed with cataract. Results The mean age of the patients was 68.6 ± 11.0 years. The mean values recorded were as follows: axial length (AL), 24.17 ± 2.47 mm; mean keratometry (Km) value, 44.26 ± 1.70 D; corneal astigmatism (CA), 1.06 ± 0.96 D; ACD, 3.02 ± 0.45 mm; lens thickness (LT), 4.52 ± 0.45 mm; central corneal thickness (CCT), 0.534 ± 0.04 mm; and white to white (WTW) corneal diameter, 11.64 ± 0.46 mm. ACD correlated positively with AL (Spearman coefficient, 0.544) and WTW (0.300), but negatively with LT (-0.660) and age (-0.285) (all P < 0.01). In the multivariate regression analysis of ACD, which included LT, AL, WTW, sex, Km, CCT, and age, there was a reasonable prediction with adjusted R2 = 0.641. Conclusions Cataract patients with longer AL and wider WTW have deeper ACD. With increasing age and lens thickening ACD becomes shallower. Based on the standardized coefficients of ACD multivariate regression analysis from the study, LT is the main factor that affects ACD, and is followed by AL.

scholarly journals Prediction of postoperative refractive astigmatism before toric intraocular lens implantation

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Atsushi Kawahara
Keyword(s):  
Regression Model ◽  
Cataract Surgery ◽  
Intraocular Lens ◽  
Corneal Thickness ◽  
Anterior Chamber Depth ◽  
Corneal Astigmatism ◽  
Toric Intraocular Lens ◽  
Toric Iol ◽  
Significant Difference ◽  
Rms Errors

Abstract Background To determine the preoperative factors influencing refractive astigmatism after cataract surgery for astigmatism correction by toric intraocular lens (IOL) implantation and to evaluate the prediction model using these factors. Methods Prospective, observational case series. The right eyes of forty consecutive patients with preoperative corneal astigmatism of the total cornea of 1.5 diopters (D) or more in magnitude and scheduled for implantation of a non-toric IOL during cataract surgery with a 2.4-mm temporal clear corneal incision were examined prospectively. The vertical/horizontal astigmatism component (J0) and oblique astigmatism component (J45) of refractive and corneal astigmatism were converted using power vector analysis. Multivariate regression analysis was performed with refractive astigmatism at three months postoperatively as the dependent variable, and preoperative parameters including age, sex, refractive astigmatism, corneal astigmatism, sphere, spherical equivalent, intraocular pressure, corneal thickness, anterior chamber depth, lens thickness, lens positions (tilt and decentration), axial length, and corneal higher order aberrations as independent variables. The root mean square (RMS) errors were calculated to express the regression model fit. Results The regression model for the J0 component was $$ Postoperative\kern0.34em refractive\kern0.2em J0=1.05\times Coneal\kern0.2em J0-0.14 $$ P o s t o p e r a t i v e r e f r a c t i v e J 0 = 1.05 × C o n e a l J 0 − 0.14 (R2 = 0.96, P < 0.001). The model for the J45 component was $$ Postoperative\kern0.34em refractive\kern0.2em J45=0.68\times Coneal\kern0.2em J45+0.19\times Preoperative\kern0.34em refractive\kern0.2em J45-0.06 $$ P o s t o p e r a t i v e r e f r a c t i v e J 45 = 0.68 × C o n e a l J 45 + 0.19 × P r e o p e r a t i v e r e f r a c t i v e J 45 − 0.06 (R2 = 0.72, P < 0.001). The mean RMS errors for preoperative corneal astigmatism alone and the multivariate model were 0.58 D and 0.46 D, respectively. There was a statistically significant difference between them (P = 0.02). Conclusions Refractive astigmatism after implantation of a toric IOL can be predicted by the regression model more accurately than by corneal astigmatism alone. However, the prediction of oblique astigmatism remains a challenge.

scholarly journals ANALYSIS OF VISUAL OUTCOME IN CATARACT PATIENTS WITH CORNEAL ASTIGMATISM UNDERGOING CATARACT SURGERY TORIC IOL IMPLANTATION

2018 ◽  
Vol 7 (49) ◽  
pp. 5304-5307
Author(s):  
Ramesh Rajasekaran ◽  
Ashok Balagopal ◽  
Meenakumari R ◽  
Prasanna Venkatesh Ramesh ◽  
Kalai Mohan
Keyword(s):  
Cataract Surgery ◽  
Visual Outcome ◽  
Corneal Astigmatism ◽  
Toric Iol ◽  
Iol Implantation ◽  
Cataract Patients

scholarly journals Preoperative Biometry and Uncorrected Visual Outcome Following Cataract Surgery at a Teaching Hospital at Western Part of Nepal

2022 ◽  
Vol 19 (1) ◽  
pp. 64-68
Author(s):  
Bikram Bahadur Thapa ◽  
Basu Prasad Adhikari ◽  
Nanda Kumari Gurung ◽  
Jitendra Kumar Verma
Keyword(s):  
Visual Acuity ◽  
Cataract Surgery ◽  
Anterior Chamber Depth ◽  
Visual Outcome ◽  
Corneal Astigmatism ◽  
Small Incision Cataract Surgery ◽  
Biometric Data ◽  
Medical College ◽  
Small Incision ◽  
The Mean

Introduction: Proper preoperative biometry in cataract surgery provides expected postoperative uncorrected visual outcome. Astigmatism is one of the major problems to achieve best postoperative unaided visual acuity. Aims: To determine the distribution of biometric parameter and unaided visual outcome in the cataract patients operated at Nepalgunj medical college, Banke, Nepal. Methods: The patients who underwent cataract surgery between January 2019 and December 2020 at Nepalgunj medical college were studied. Patient’s demographic parameter, keratometric value, anterior chamber depth, lens thickness and axial length data, type of surgery, preoperative and post-operative visual acuity and other clinical details were collected and analyzed. Results: This study enrolled 261 eyes of 261 patients who had undergone cataract surgery. The mean age of patients was 60.8 ± 14.62 years. The mean corneal astigmatism was 1.30±1.43 D. Corneal astigmatism was higher than 1.00 D in almost 40% of cases. With-therule astigmatism was the most common type (46.4%) of astigmatism observed in this study. The mean average keratometry was 44.83±2.05 D. The mean preoperative LogMAR VA of 1.52±0.83 improved to 0.48 ± 0.48 postoperatively without statistically significant differences between manual small incision cataract surgery and phacoemulsification technique (p=0.496). Conclusion: The biometric data helps to improve surgical procedure and select most appropriate intraocular lens to attain maximal postoperative uncorrected visual acuity following cataract surgery. This study found superior convention incision is better for cataract surgery with equivalent visual outcome following manual small incision cataract surgery and phacoemulsification.

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