SlideShare a Scribd company logo
Does Sanders-Retzlaff-Kraff (SRK-2) formula suit a Sri Lankan
                             population in phacoemulsification cataract surgery
                                                         of medium axial length?
     MS                  MS Amaratunge , J De Silva1, IM Wasthuhewaarachchi , SH Uyangoda , MAJI Mallawaarachchi , R
                                           1                                         2                    1                     1

Premarathna3, AAN Nishad4
                                          Vijaya Kumaratunge Memorial Hospital, Seeduwa Teaching Hospital, Vavuniya
                                          1                                                           2

                  3
                    Faculty of Medicine, University of Kelaniya 4Post Graduate Institute of Medicine, University of Colombo

                                                                                            Results
                                                            274 patients, mean (S.D.) age was 65.3(10) years.
                                                            56% were females.
 Introduction                                               90(32.8%) had diabetes mellitus and 107(39%) had
 Intraocular lens (IOL) power calculation formulas          hypertension.
 have evolved over the past 25 years. The most              The right eye was operated in 142 (51.8%) patients and the
 recent formulas (third and fourth generation) are the      left eye in 132 (48.2%).
 most useful and precise                                             Table 1. Visual acuity 7 days post operatively
 Prediction accuracy depends on three factors:                           Visual acuity                        Percentage
 #accuracy of the biometric data (axial length and                           6/6                                 79%
 keratometry readings),
 #accuracy of manufactured IOL power quality                                 > 6/9                              93%
 control #accuracy of the IOL power formulas                            > 6/12 to 6/36                          97%

 Introduction of phacoemulsification with small               Mean (S.D.) IOL power used was 21.50D (1.90D), (range; 10.0D to
 incision techniques, minimizing cylindrical error, and       25.5D).
 continuous curvilinear capsulorhexis technique, that         The mean predicted refractive error with SRK-2 was -0.300 ± 0.145 D
 allows better IOL capsular fixation and more                 (range, -0.05D to -0.7D).
 predictable ELP                                              The mean achieved refractive error was -0.220 ± 0.732 D (range,
                                                              +1.00 to -1.5 D).
                                                              The difference between predicted and achieved refractive error
 The correct IOL power became a crucial step for
                                                              presented a slight hyperopic shift (mean ± SD: 0.054 ± 0.397 D),
 good refractive outcome in the preoperative
 examination of cataract surgery.                             
                                                                  ranging from -1.31 D to + 1.19 D.
                                                                 Graph 1. Correlation between Targeted refraction and
                                                               Refraction Targeted with SRK 2 (Pearson Correlation=0.126
                                                                                       (p=0.038)

                    Objectives
  To evaluate the predictive accuracy of post operative
refraction using SRK-2 formula in phacoemulsification in
            eyes with 22-26mm axial length.




                     Methods
 Senile cataract patients who underwent
 phacoemulsification and IOL between January to
 December 2010 in Gampaha district by a single                                              Conclusion
 surgeon.                                                      SRK-2 formula as a good option to predict the refractive error
 Eyes with 22-26mm axial length.                              after cataract extraction by phacoemulsification in eyes with
 Single examiner measured simulated manual                    medium axial length.
 keratometry preoperatively and seven days
 postoperatively; uncorrected visual acuity, slit lamp         Unique in reporting eyes implanted in the capsular bag by the
 examination of the anterior segment and best                  same surgeon, with preoperative measurements obtained from
 spectacle-corrected visual acuity (BSCVA) were taken.         the same instrumentation by the same method and same
 The implanted IOL power was used to calculate                technician, using SRK-2 formula for IOL power calculation in eyes
 predicted postoperative refractive error by SRK-2             with medium axial length that underwent phacoemulsification
 formula.                                                      with foldable IOL implantation.



Sri Lanka Medical Association , 125th Anniversary International Medical Congress, Colombo, Sri Lanka

More Related Content

What's hot

Ospe eye for post graduate ophthalmic student such as FCPS. FRCOphth
Ospe eye for post graduate ophthalmic student such as FCPS. FRCOphthOspe eye for post graduate ophthalmic student such as FCPS. FRCOphth
Ospe eye for post graduate ophthalmic student such as FCPS. FRCOphth
Anisur Rahman
 

What's hot (20)

320º Six Month Follow up
320º Six Month Follow up320º Six Month Follow up
320º Six Month Follow up
 
Segmentos de Anel de Ferrara com arco de 140º
Segmentos de Anel de Ferrara com arco de 140ºSegmentos de Anel de Ferrara com arco de 140º
Segmentos de Anel de Ferrara com arco de 140º
 
12 large case series
12 large case series12 large case series
12 large case series
 
C01230912
C01230912C01230912
C01230912
 
Diagnosis of Diabetic Retinopathy by Detection of Microneurysm And Exudates
Diagnosis of Diabetic Retinopathy by Detection of Microneurysm And ExudatesDiagnosis of Diabetic Retinopathy by Detection of Microneurysm And Exudates
Diagnosis of Diabetic Retinopathy by Detection of Microneurysm And Exudates
 
AN EXPLORATION OF PERIOCULAR REGION WITH REDUCED REGION FOR AUTHENTICATION : ...
AN EXPLORATION OF PERIOCULAR REGION WITH REDUCED REGION FOR AUTHENTICATION : ...AN EXPLORATION OF PERIOCULAR REGION WITH REDUCED REGION FOR AUTHENTICATION : ...
AN EXPLORATION OF PERIOCULAR REGION WITH REDUCED REGION FOR AUTHENTICATION : ...
 
An exploration of periocular region with reduced region for authentication re...
An exploration of periocular region with reduced region for authentication re...An exploration of periocular region with reduced region for authentication re...
An exploration of periocular region with reduced region for authentication re...
 
SUPERPIXEL CLASSIFICATION BASED OPTIC DISC AND OPTIC CUP SEGMENTATION FOR GLA...
SUPERPIXEL CLASSIFICATION BASED OPTIC DISC AND OPTIC CUP SEGMENTATION FOR GLA...SUPERPIXEL CLASSIFICATION BASED OPTIC DISC AND OPTIC CUP SEGMENTATION FOR GLA...
SUPERPIXEL CLASSIFICATION BASED OPTIC DISC AND OPTIC CUP SEGMENTATION FOR GLA...
 
IRJET -Analysis of Ophthalmic System Applications using Signal Processing
IRJET -Analysis of Ophthalmic System Applications using Signal ProcessingIRJET -Analysis of Ophthalmic System Applications using Signal Processing
IRJET -Analysis of Ophthalmic System Applications using Signal Processing
 
IRJET- Approach for Diabetic Retinopathy Analysis using Artificial Neural Net...
IRJET- Approach for Diabetic Retinopathy Analysis using Artificial Neural Net...IRJET- Approach for Diabetic Retinopathy Analysis using Artificial Neural Net...
IRJET- Approach for Diabetic Retinopathy Analysis using Artificial Neural Net...
 
H0366051058
H0366051058H0366051058
H0366051058
 
Ospe eye for post graduate ophthalmic student such as FCPS. FRCOphth
Ospe eye for post graduate ophthalmic student such as FCPS. FRCOphthOspe eye for post graduate ophthalmic student such as FCPS. FRCOphth
Ospe eye for post graduate ophthalmic student such as FCPS. FRCOphth
 
12 correlation of anterior segment parameters
12 correlation of anterior segment parameters12 correlation of anterior segment parameters
12 correlation of anterior segment parameters
 
A DISSERTATION ON “EVALUATION OF ANTERIOR SEGMENT IMAGING TECHNIQUES IN DIAG...
A DISSERTATION ON  “EVALUATION OF ANTERIOR SEGMENT IMAGING TECHNIQUES IN DIAG...A DISSERTATION ON  “EVALUATION OF ANTERIOR SEGMENT IMAGING TECHNIQUES IN DIAG...
A DISSERTATION ON “EVALUATION OF ANTERIOR SEGMENT IMAGING TECHNIQUES IN DIAG...
 
Lenstar 900 'Improving Outcomes' Brochure
Lenstar 900 'Improving Outcomes' BrochureLenstar 900 'Improving Outcomes' Brochure
Lenstar 900 'Improving Outcomes' Brochure
 
Iol power calculation normal and post lasik eyes
Iol power calculation normal and post lasik eyesIol power calculation normal and post lasik eyes
Iol power calculation normal and post lasik eyes
 
Opthelmology services & treatments
Opthelmology services & treatmentsOpthelmology services & treatments
Opthelmology services & treatments
 
A Comparative Study of Age Related Macular Degeneration In Relation To SD-OCT...
A Comparative Study of Age Related Macular Degeneration In Relation To SD-OCT...A Comparative Study of Age Related Macular Degeneration In Relation To SD-OCT...
A Comparative Study of Age Related Macular Degeneration In Relation To SD-OCT...
 
Master thesis - Long Bone Segmentation and Fracture Detection in X-ray Images
Master thesis - Long Bone Segmentation and Fracture Detection in X-ray ImagesMaster thesis - Long Bone Segmentation and Fracture Detection in X-ray Images
Master thesis - Long Bone Segmentation and Fracture Detection in X-ray Images
 
Effect of the Human Eye Cornea Material Property on Measurement of the Intrao...
Effect of the Human Eye Cornea Material Property on Measurement of the Intrao...Effect of the Human Eye Cornea Material Property on Measurement of the Intrao...
Effect of the Human Eye Cornea Material Property on Measurement of the Intrao...
 

Viewers also liked (11)

Results of phacoemulsification in high myopia
Results of phacoemulsification in high myopiaResults of phacoemulsification in high myopia
Results of phacoemulsification in high myopia
 
Phacoemulsification in myopic eyes
Phacoemulsification in myopic eyesPhacoemulsification in myopic eyes
Phacoemulsification in myopic eyes
 
Early phacoemulsification experience with toric iol
Early phacoemulsification experience with toric iolEarly phacoemulsification experience with toric iol
Early phacoemulsification experience with toric iol
 
Amar agarwal gas-forced infusion prevents endothelial cell-letter to editor
Amar agarwal gas-forced infusion prevents endothelial cell-letter to editorAmar agarwal gas-forced infusion prevents endothelial cell-letter to editor
Amar agarwal gas-forced infusion prevents endothelial cell-letter to editor
 
Phacodynamic
PhacodynamicPhacodynamic
Phacodynamic
 
Advances in cataract surgery
Advances in cataract surgeryAdvances in cataract surgery
Advances in cataract surgery
 
Cataract surgery
Cataract surgery Cataract surgery
Cataract surgery
 
OVD RESULTS IN PHACO
OVD RESULTS IN PHACOOVD RESULTS IN PHACO
OVD RESULTS IN PHACO
 
Phacoemulsification
PhacoemulsificationPhacoemulsification
Phacoemulsification
 
Phacoemulsification
PhacoemulsificationPhacoemulsification
Phacoemulsification
 
Common pitfalls while learning phacoemulsification dr suresh k pandey su vi e...
Common pitfalls while learning phacoemulsification dr suresh k pandey su vi e...Common pitfalls while learning phacoemulsification dr suresh k pandey su vi e...
Common pitfalls while learning phacoemulsification dr suresh k pandey su vi e...
 

Similar to Srk2 Formula in Sri Lanka

FR and the astigmatism after penetrating keratoplasty
FR and the astigmatism after penetrating keratoplastyFR and the astigmatism after penetrating keratoplasty
FR and the astigmatism after penetrating keratoplasty
Ferrara Ophthalmics
 
000304 ascrs poster_032907
000304 ascrs poster_032907000304 ascrs poster_032907
000304 ascrs poster_032907
SUSHIL BHATT
 
Corneal Astigmatism
Corneal AstigmatismCorneal Astigmatism
Corneal Astigmatism
kaushyk
 

Similar to Srk2 Formula in Sri Lanka (20)

12 wavefront aberrations
12 wavefront aberrations12 wavefront aberrations
12 wavefront aberrations
 
Ferrara ICRS in Mild Keratoconus
Ferrara ICRS in Mild KeratoconusFerrara ICRS in Mild Keratoconus
Ferrara ICRS in Mild Keratoconus
 
Clinical discussion on Biometry for IOL power calculation
Clinical discussion on Biometry for IOL power calculationClinical discussion on Biometry for IOL power calculation
Clinical discussion on Biometry for IOL power calculation
 
Tomographic fundus features in Pseudoxanthoma Elasticum
Tomographic fundus features in Pseudoxanthoma Elasticum Tomographic fundus features in Pseudoxanthoma Elasticum
Tomographic fundus features in Pseudoxanthoma Elasticum
 
Dr. Vedat Kaya (MAKALE)
Dr. Vedat Kaya (MAKALE)Dr. Vedat Kaya (MAKALE)
Dr. Vedat Kaya (MAKALE)
 
12 refractive tomographic biomechanical outcomes
12 refractive tomographic biomechanical outcomes12 refractive tomographic biomechanical outcomes
12 refractive tomographic biomechanical outcomes
 
FR and the astigmatism after penetrating keratoplasty
FR and the astigmatism after penetrating keratoplastyFR and the astigmatism after penetrating keratoplasty
FR and the astigmatism after penetrating keratoplasty
 
Comparative Study of Visual Outcome between Femtosecond Lasik with Excimer La...
Comparative Study of Visual Outcome between Femtosecond Lasik with Excimer La...Comparative Study of Visual Outcome between Femtosecond Lasik with Excimer La...
Comparative Study of Visual Outcome between Femtosecond Lasik with Excimer La...
 
Japan Study Influence of overnight orthokeratology on axial length elongation...
Japan Study Influence of overnight orthokeratology on axial length elongation...Japan Study Influence of overnight orthokeratology on axial length elongation...
Japan Study Influence of overnight orthokeratology on axial length elongation...
 
Biometry
BiometryBiometry
Biometry
 
Variability of Corneal Deformation Response in Normal, Keratoconic, and Post-...
Variability of Corneal Deformation Response in Normal, Keratoconic, and Post-...Variability of Corneal Deformation Response in Normal, Keratoconic, and Post-...
Variability of Corneal Deformation Response in Normal, Keratoconic, and Post-...
 
A scan biometry
A scan biometryA scan biometry
A scan biometry
 
Novel biometer first 30 eyes
Novel biometer   first 30 eyesNovel biometer   first 30 eyes
Novel biometer first 30 eyes
 
Biometery
BiometeryBiometery
Biometery
 
EDOF IOL
EDOF IOLEDOF IOL
EDOF IOL
 
IOL POWER CALCULATION IN CHILDREN-Dr.Preetiilal.pptx
IOL POWER CALCULATION IN CHILDREN-Dr.Preetiilal.pptxIOL POWER CALCULATION IN CHILDREN-Dr.Preetiilal.pptx
IOL POWER CALCULATION IN CHILDREN-Dr.Preetiilal.pptx
 
000304 ascrs poster_032907
000304 ascrs poster_032907000304 ascrs poster_032907
000304 ascrs poster_032907
 
Journal Presentation.pptx
Journal Presentation.pptxJournal Presentation.pptx
Journal Presentation.pptx
 
Corneal Astigmatism
Corneal AstigmatismCorneal Astigmatism
Corneal Astigmatism
 
Iol
IolIol
Iol
 

Recently uploaded

Recently uploaded (20)

Retinal consideration in cataract surgery
Retinal consideration in cataract surgeryRetinal consideration in cataract surgery
Retinal consideration in cataract surgery
 
DIGITAL RADIOGRAPHY-SABBU KHATOON .pptx
DIGITAL RADIOGRAPHY-SABBU KHATOON  .pptxDIGITAL RADIOGRAPHY-SABBU KHATOON  .pptx
DIGITAL RADIOGRAPHY-SABBU KHATOON .pptx
 
Denture base resins materials and its mechanism of action
Denture base resins materials and its mechanism of actionDenture base resins materials and its mechanism of action
Denture base resins materials and its mechanism of action
 
ANATOMY OF THE LOWER URINARY TRACT AND MALE [Autosaved] [Autosaved].pptx
ANATOMY OF THE LOWER URINARY TRACT AND MALE [Autosaved] [Autosaved].pptxANATOMY OF THE LOWER URINARY TRACT AND MALE [Autosaved] [Autosaved].pptx
ANATOMY OF THE LOWER URINARY TRACT AND MALE [Autosaved] [Autosaved].pptx
 
Factors Affecting child behavior in Pediatric Dentistry
Factors Affecting child behavior in Pediatric DentistryFactors Affecting child behavior in Pediatric Dentistry
Factors Affecting child behavior in Pediatric Dentistry
 
CNN-based plastic waste detection system
CNN-based plastic waste detection systemCNN-based plastic waste detection system
CNN-based plastic waste detection system
 
Hemodialysis: Chapter 2, Extracorporeal Blood Circuit - Dr.Gawad
Hemodialysis: Chapter 2, Extracorporeal Blood Circuit - Dr.GawadHemodialysis: Chapter 2, Extracorporeal Blood Circuit - Dr.Gawad
Hemodialysis: Chapter 2, Extracorporeal Blood Circuit - Dr.Gawad
 
Compare home pulse pressure components collected directly from home
Compare home pulse pressure components collected directly from homeCompare home pulse pressure components collected directly from home
Compare home pulse pressure components collected directly from home
 
Cervical screening – taking care of your health flipchart (Vietnamese)
Cervical screening – taking care of your health flipchart (Vietnamese)Cervical screening – taking care of your health flipchart (Vietnamese)
Cervical screening – taking care of your health flipchart (Vietnamese)
 
A thorough review of supernormal conduction.pptx
A thorough review of supernormal conduction.pptxA thorough review of supernormal conduction.pptx
A thorough review of supernormal conduction.pptx
 
180-hour Power Capsules For Men In Ghana
180-hour Power Capsules For Men In Ghana180-hour Power Capsules For Men In Ghana
180-hour Power Capsules For Men In Ghana
 
World Hypertension Day 17th may 2024 ppt
World Hypertension Day 17th may 2024 pptWorld Hypertension Day 17th may 2024 ppt
World Hypertension Day 17th may 2024 ppt
 
Scleroderma: Treatment Options and a Look to the Future - Dr. Macklin
Scleroderma: Treatment Options and a Look to the Future - Dr. MacklinScleroderma: Treatment Options and a Look to the Future - Dr. Macklin
Scleroderma: Treatment Options and a Look to the Future - Dr. Macklin
 
Relationship between vascular system disfunction, neurofluid flow and Alzheim...
Relationship between vascular system disfunction, neurofluid flow and Alzheim...Relationship between vascular system disfunction, neurofluid flow and Alzheim...
Relationship between vascular system disfunction, neurofluid flow and Alzheim...
 
Creating Accessible Public Health Communications
Creating Accessible Public Health CommunicationsCreating Accessible Public Health Communications
Creating Accessible Public Health Communications
 
Cas 28578-16-7 PMK ethyl glycidate ( new PMK powder) best suppler
Cas 28578-16-7 PMK ethyl glycidate ( new PMK powder) best supplerCas 28578-16-7 PMK ethyl glycidate ( new PMK powder) best suppler
Cas 28578-16-7 PMK ethyl glycidate ( new PMK powder) best suppler
 
Antiplatelets in IHD, Dose Duration, DAPT vs SAPT
Antiplatelets in IHD, Dose Duration, DAPT vs SAPTAntiplatelets in IHD, Dose Duration, DAPT vs SAPT
Antiplatelets in IHD, Dose Duration, DAPT vs SAPT
 
The Orbit & its contents by Dr. Rabia I. Gandapore.pptx
The Orbit & its contents by Dr. Rabia I. Gandapore.pptxThe Orbit & its contents by Dr. Rabia I. Gandapore.pptx
The Orbit & its contents by Dr. Rabia I. Gandapore.pptx
 
BMK Glycidic Acid (sodium salt) CAS 5449-12-7 Pharmaceutical intermediates
BMK Glycidic Acid (sodium salt)  CAS 5449-12-7 Pharmaceutical intermediatesBMK Glycidic Acid (sodium salt)  CAS 5449-12-7 Pharmaceutical intermediates
BMK Glycidic Acid (sodium salt) CAS 5449-12-7 Pharmaceutical intermediates
 
PT MANAGEMENT OF URINARY INCONTINENCE.pptx
PT MANAGEMENT OF URINARY INCONTINENCE.pptxPT MANAGEMENT OF URINARY INCONTINENCE.pptx
PT MANAGEMENT OF URINARY INCONTINENCE.pptx
 

Srk2 Formula in Sri Lanka

  • 1. Does Sanders-Retzlaff-Kraff (SRK-2) formula suit a Sri Lankan population in phacoemulsification cataract surgery of medium axial length? MS MS Amaratunge , J De Silva1, IM Wasthuhewaarachchi , SH Uyangoda , MAJI Mallawaarachchi , R 1 2 1 1 Premarathna3, AAN Nishad4 Vijaya Kumaratunge Memorial Hospital, Seeduwa Teaching Hospital, Vavuniya 1 2 3 Faculty of Medicine, University of Kelaniya 4Post Graduate Institute of Medicine, University of Colombo Results 274 patients, mean (S.D.) age was 65.3(10) years. 56% were females. Introduction 90(32.8%) had diabetes mellitus and 107(39%) had Intraocular lens (IOL) power calculation formulas hypertension. have evolved over the past 25 years. The most The right eye was operated in 142 (51.8%) patients and the recent formulas (third and fourth generation) are the left eye in 132 (48.2%). most useful and precise Table 1. Visual acuity 7 days post operatively Prediction accuracy depends on three factors: Visual acuity Percentage #accuracy of the biometric data (axial length and 6/6 79% keratometry readings), #accuracy of manufactured IOL power quality > 6/9 93% control #accuracy of the IOL power formulas > 6/12 to 6/36 97% Introduction of phacoemulsification with small Mean (S.D.) IOL power used was 21.50D (1.90D), (range; 10.0D to incision techniques, minimizing cylindrical error, and 25.5D). continuous curvilinear capsulorhexis technique, that The mean predicted refractive error with SRK-2 was -0.300 ± 0.145 D allows better IOL capsular fixation and more (range, -0.05D to -0.7D). predictable ELP The mean achieved refractive error was -0.220 ± 0.732 D (range, +1.00 to -1.5 D). The difference between predicted and achieved refractive error The correct IOL power became a crucial step for presented a slight hyperopic shift (mean ± SD: 0.054 ± 0.397 D), good refractive outcome in the preoperative examination of cataract surgery.  ranging from -1.31 D to + 1.19 D. Graph 1. Correlation between Targeted refraction and Refraction Targeted with SRK 2 (Pearson Correlation=0.126 (p=0.038) Objectives To evaluate the predictive accuracy of post operative refraction using SRK-2 formula in phacoemulsification in eyes with 22-26mm axial length. Methods Senile cataract patients who underwent phacoemulsification and IOL between January to December 2010 in Gampaha district by a single Conclusion surgeon. SRK-2 formula as a good option to predict the refractive error Eyes with 22-26mm axial length. after cataract extraction by phacoemulsification in eyes with Single examiner measured simulated manual medium axial length. keratometry preoperatively and seven days postoperatively; uncorrected visual acuity, slit lamp Unique in reporting eyes implanted in the capsular bag by the examination of the anterior segment and best same surgeon, with preoperative measurements obtained from spectacle-corrected visual acuity (BSCVA) were taken. the same instrumentation by the same method and same The implanted IOL power was used to calculate technician, using SRK-2 formula for IOL power calculation in eyes predicted postoperative refractive error by SRK-2 with medium axial length that underwent phacoemulsification formula. with foldable IOL implantation. Sri Lanka Medical Association , 125th Anniversary International Medical Congress, Colombo, Sri Lanka