ABSTRACT
Objective: To determine the relationship of the van Herick angle grading system with the level of iris insertion and peripheral iris configuration
Study Design: Observational study
Place and Duration of Study: Eye department, Combined Military Hospital, Malir Cantt., Karachi, from May to October 2015
Methodology: Sixty-five eyes of 65 patients were recruited. Anterior chamber depth at the temporal limbus was measured as a fraction of corneal section thickness using van Herick technique and graded on the standard 4-point scale of the van Herick grading system. Gonioscopy of the temporal quadrant was performed with a Posner 4 mirror goniolens and both the true level of iris insertion and peripheral iris configuration were recorded on a 4-point scale so as to equate with the van Herick 4-point grading system. Spearman's rho test was applied to determine the relationship of the van Herick grading system with level of iris root insertion and peripheral iris configuration
Results: A moderate positive correlation between van Herick grade and peripheral iris configuration was found which was statistically significant [rs=0.42, p < 0.001]. A statistically significant and moderate positive correlation was also detected between van Herick grade and the level of iris insertion [rs=0.45, p < 0.001]
Conclusion: The van Herick grade has a moderately positive relationship with the peripheral iris configuration and true level of iris insertion
ABSTRACT
Objective: To compare the corneal astigmatism before and after the excision of pterygium and also to determine the correlation of pterygium size with the postoperative corneal astigmatism. Study Design: Cross-sectional interventional study. Place and Duration of Study: Eye Department, Combined Military Hospital, Abbottabad, from May 2011 to March 2012
Methodology: Thirty patients underwent pterygium excision. Pre-operatively Snellen visual acuity, manifest refraction and slit lamp examination was done. The size of the pterygium was recorded in mm by projecting a horizontal slit lamp beam from the limbus to the apex. All the pterygium were equal to or greater than 2.5 mm. Keratometry was performed with an automated keratometer. Keratometric data was recorded pre-operatively and at 28 days postoperatively. Wilcoxon signed rank test was used for comparing the pre-operative and the postoperative corneal astigmatism. Spearman's rank order was calculated to observe correlation of pterygium size with the postoperative astigmatism
Results: The median [mean rank] pre-operative astigmatism of 2.25 [15.50] reduced to a median [mean rank] postoperative astigmatism of 1.30 [14.96]. This decrease in the postoperative astigmatism was statistically significant [p < 0.001]. There was a statistically non-significant correlation between the postoperative astigmatism and the pterygium size [rs = -0.29, p = 0.12]
Conclusion: Pterygium excision caused significant reduction in corneal astigmatism