Normative Values and Contralateral Comparison of Anterior Chamber Depth Measured by Orbscan II in an Iranian Population

Purpose: The objective of study was (i) to determine the normative values of anterior chamber depth (ACD) with Orbscan II Topography System and (ii) to compare right and left eyes data in the normal young population. Methods: A total of 1001 healthy participants aged 18-45 years participated in this observational cross-sectional study. The study population consisted of 616 female and 385 male subjects. The ACD was measured with the Orbscan II. In our study, ACD was defined as the distance between the corneal epithelium and the anterior lens surface. The differences between genders, between right and left eyes and age-related changes were evaluated. Statistical analyses were performed using student t test. Results: The average ACD in our study population was recorded as 3.653 ± 0.306 mm (median: 3.670 mm, mode: 3.70 mm, minimum: 2.35 mm and maximum: 6.60 mm, 95% Confidence interval: 3.640 to 3.666). The ACD was 3.64±0.30 mm in males and 3.67±0.32 mm in females which was statistically different between genders (P < 0.01). There was a much similarity in ACD values in both eyes. ACD was decreased with age (r= -0.250, p<0.001). Conclusion: Detailed description and analysis of ACD with Orbscan demonstrated that the obtained average value of ACD was higher in female than male and decreased slightly with increasing age. There was no difference between the eyes.