Correlation between ocular axial length, anterior chamber depth, Average K-values and a differential analysis in short

Abstract

Introduction: To study correlation between ocular axial length, Average K-values and anterior chamber depth in eyes and to differentially analyse strength of this correlation in eyes with short axial length.

Materials and Methods: The present study conducted an observational study where keratometry and ultrasound biometry records of 100 patients reporting for cataract surgery were taken. A comparative analysis using ultrasound Biometry and automated keratometry for pre-operative measurement of Axial length (AL), Average K-value, Anterior chamber depth (ACD) and calculated IOL power was done. Statistical Analysis was done to determine overall correlation between three parameters. Patients were then classified into various groups of short AL for a differential comparison within the group. Kendall-Pearson correlation test was used to assess relationship between AL and ACD, overall and within each subgroup. A P -value < 0.05 was considered as statistically significant.

Results: Comparison of axial length with various clinical parameters showed a p- value of 0.00 , suggestive of highly significant statistical correlation of ACD between 2 sub-groups( Group A; 20.00 to 20.99mm and Group B; 21.00 to 22.00) and Correlation analysis between AXL, ACD and Average K showed p –value of 0.00 , suggestive of highly significant statistical correlation between AXL and ACD.

Conclusions: As mean AL decreases ACD also decreases. In eyes with short AL there is wide variability in ACD which is either due to variable lens thickness or lens location in different eyes.