Validity of Novel Microsoft Excel Software for Calculating Surgically Induced Astigmatism
Journal Title: Ophthalmology Research: An International Journal - Year 2016, Vol 5, Issue 4
Abstract
Purpose: To investigate validity and predictability of a new software calculator for surgically induced astigmatism quantification. Techniques and Methods: A new astigmatic calculator was designed, based on Pythagorean principle and trigonometric functions using Microsoft office excel 2007. Astigmatic magnitude was quantified in diopters and axis direction was depicted in degrees. Calculator was applied, investigated and analyzed on 30 pseudophakic eyes that underwent temporal scleral incision surgery with in the bag intraocular lens implantation. Pre and postoperative anterior corneal curvature was measured with Bausch and Lomb keratometer. Similarities and differences were compared with the existing version 1.1 and 2.1 calculators and statistical analysis was performed using Microsoft excel. Results: Mean pre and postoperative astigmatic magnitude was calculated as 62.67 (+/- 2.40) and 62.83 (+/- 2.29) diopters. Mean pre and postoperative astigmatic axis was 89.74 (+/- 1.37) and 89.51 (+/- 1.37) degrees. Pearson’s coefficient (r) was calculated as 0.91 and 0.83; coefficient of determinations (R2) was calculated as 0.82 and 0.68 for astigmatic magnitudes and axes respectively. Student chi-square test was used to calculate T values, which were 0.39 and 0.26 for astigmatic magnitude and axis respectively. P value less than 0.05 was considered as statistically significant (p 0.16). Validity was compared with existing surgically induced astigmatism calculators 1.1 and 2.1 versions and predictability was assessed by y=2.83+0.95x for astigmatic magnitude and y=15.28+0.83x equations for astigmatic axis. Conclusion: Present Microsoft excel calculator application was valid as the values for astigmatic magnitude and axis were comparable with existing SIA calculators and can be used for astigmatic predictability.
Authors and Affiliations
Prabhakar Srinivasapuram Krishnacharya, Anuj Kumar Singal, A. Shamsiya Naaz, Raghavender Reddy Arra, Pooja A. Angadi, Ashwini Chandramouli
Keywords
Related Articles
- EP ID EP327556
- DOI 10.9734/OR/2016/22108
- Views 111
- Downloads 0
Visual Outcome versus Vision Satisfaction after Intravitreal Bevasizumb Injection in Diabetic Retinopathy
Introduction: Diabetic retinopathy as an important complication of diabetes mellitus is a common cause of blindness in diabetic people. A cure or treatment is not available yet. This study was designed to investigate the...
Screening for Ophthalmic Disorders among Deaf School Children in Nigeria- A Neglected Population
Background: The visual and auditory systems are vital for the optimal development of a child. However recent studies have shown that the incidence of visual problems in the deaf is higher than in their hearing counterpar...
Detecting Visuoperceptive Defects in Adolescent and Adult Disabled Readers with the TETRA Analyzer™. Pathological Sample and Comparison with Normal Readers
Aims: To investigate visuoperceptive abnormalities in adult dyslexics with the TETRA Analyzer™, and to compare the results with those obtained with normal adult readers. Study Design: Epidemiological study. Place and Dur...
My Experience with Levator Resection Surgery in Congenital Ptosis
Aims: To assess the effectiveness of Levator resection surgery in patients with moderate to severe congenital ptosis with poor Levator function. Materials and Methods: Settings and Design: A prospective, observational, s...
Traumatic Cataract
Traumatic cataract is more common in younger individuals. Traumatic cataract is an important cause of uniocular visual loss and is often sudden in onset. Traumatic lens damage may be caused by mechanical or non-mechanica...