Corneal Keratometry Changes Post Pterygium Excision
Journal Title: Scholars Journal of Applied Medical Sciences - Year 2018, Vol 6, Issue 8
Abstract
Pterygium is a common disease which can cause annoying symptoms like redness, irritation and foreign body sensation. If large in size, it can lead to astigmatism. Excision of pterygium results in reduction in astigmatism and patient feels aesthetically better. To determine the difference in mean corneal keratometry before and after pterygium excision, by using automated refraction with keratometry. Quasi -experimental study (pretest and posttest design). 60 patients is selected for study by using cochran formula* of hospital based study. (We have done the pilot test of one week data the average opd of the department was 84 per day out of these 84 patients 16 patients from pterygium. So p = 0.19 and we put these p on cochran formula and find sample of 59 patients which is round of to 60). This study was conducted on 60 patients visiting the outpatient department with primary pterygium, before and after pterygium surgery for corneal keratometry changes. Automated refraction and automated keratometry were used to calculate the cylindrical error and the corneal surface power respectively. The mean and standard deviation were calculated for the corneal curvatures and the refractive cylinder before and after the operation. Paired sample t-test and one way ANOVA were used to compare the corneal curvatures and refractive cylinder before and after pterygium excision. P-value <0.05 was considered significant. The preoperative cylindrical error decreased from 4.23 ± 1.67 D to 2.09 ± 1.95D postoperatively. Similarly, before surgery, the keratometry readings were 43.61 ± 1.12 D in horizontal meridian and 44.74 ± 1.41 D in vertical meridian. One week after the pterygium surgery these values were 44.45 ± 0.85 D in horizontal meridian and 45.23 ± 0.78 D in vertical meridian. Pterygium excision brings a statistically significant change in corneal keratometry readings which lead to a decrease in cylindrical correction needed. This causes an improvement in subjective visual acuity in patients who have undergone pterygium surgery.
Authors and Affiliations
Dr. Sanjeev Verma, Dr. Saumya Saxena
Keywords
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