A Comparative Study to Assess the Predictability of Different IOL Power Calculation Formulas in Eyes of Short and Long Axial Length
Journal Title: Journal of Clinical and Diagnostic Research - Year 2017, Vol 11, Issue 1
Abstract
Introduction: Accurate Intraocular Lens (IOL) power calculation in cataract surgery is very important for providing postoperative precise vision. Selection of most appropriate formula is difficult in high myopic and hypermetropic patients. Aim: To investigate the predictability of different IOL (Intra Ocular Lens) power calculation formulae in eyes with short and long Axial Length (AL) and to find out most accurate IOL power calculation formula in both groups. Materials and Methods: A prospective study was conducted on 80 consecutive patients who underwent phacoemulsification with monofocal IOL implantation after obtaining an informed and written consent. Preoperative keratometry was done by IOL Master. Axial length and anterior chamber depth was measured using A-scan machine ECHORULE 2 (BIOMEDIX). Patients were divided into two groups based on AL. (40 in each group). Group A with AL<22 mm and Group B with AL>24.5 mm. The IOL power calculation in each group was done by Haigis, Hoffer Q, Holladay-I, SRK/T formulae using the software of ECHORULE 2. The actual postoperative Spherical Equivalent (SE), Estimation error (E) and Absolute Error (AE) were calculated at one and half months and were used in data analysis. The predictive accuracy of each formula in each group was analyzed by comparing the Absolute Error (AE). The Kruskal Wallis test was used to compare differences in the (AE) of the formulae. A statistically significant difference was defined as p-value<0.05. Results: In Group A, Hoffer Q, Holladay 1 and SRK/T formulae were equally accurate in predicting the postoperative refraction after cataract surgery (IOL power calculation) in eyes with AL less than 22.0 mm and accuracy of these three formulae was significantly higher than Haigis formula. Whereas in Group B, Hoffer Q, Holladay 1, SRK/T and Haigis formulae were equally accurate in predicting the postoperative refraction after cataract surgery (IOL power calculation) in eyes with AL more than 24.5 mm. Conclusion: Hoffer Q, Holladay 1 and SRK/T formulae were showing significantly higher accuracy than Haigis formula in predicting the postoperative refraction after cataract surgery (IOL power calculation) in eyes with AL less than 22.0 mm. In eyes with AL more than 24.5 mm Hoffer Q, Holladay 1, SRK/T and Haigis formulae were equally accurate.
Authors and Affiliations
Dharmil Doshi, purvi limdi, nilesh parekh, neepa gohil
Keywords
Related Articles
- EP ID EP328315
- DOI 10.7860/JCDR/2017/22095.9136
- Views 169
- Downloads 0
Bilateral Pneumothorax-rare Manifestation of Melioidosis
ABSTRACT Melioidosis is caused by gram negative bacilli called Burkholderia pseudomallei. It is an infectious threat to southeast Asian population. It predominantly affects the diabetic people who have got exposure to th...
Brainstem Auditory Evoked Potential in Preterm Infants and its Relation with Gestational Age
ABSTRACT Introduction: Preterm births are associated with different neuro developmental abnormalities. During the last trimester of pregnancy, a part of foetal brain development occurs. Some area of the brain does not sh...
Effect of Atorvastatin on Glycaemic Parameters in Normoglycaemic and Prediabetic Subjects: A Prospective, Panel Study
Introduction: Type 2 diabetes is associated with obesity and dyslipidemia, which are risk factor for cardiovascular disease. With recent FDA approved indications for statins being widened because of its lipid lowering an...
Perceptions of Accredited Social Health Activists Regarding Teenage Pregnancy: A Qualitative Study in a Rural Area of West Bengal, India
Introduction: Teenage pregnancy is one of the most important social and public health problems all over the world. Accredited Social Health Activists (ASHAs) may play a substantial role to reduce the magnitude of the pro...
Extra-adrenal Myelolipoma: Tumour at an Unusual Site
A myelolipoma is a rare, well circumscribed, benign tumour composed of mature adipose and haematopoietic tissue. Classical location is adrenal gland but extra-adrenal cases are also reported in the presacral region, live...