Background: Anterior chamber depth could be simply measured by slit lamp biomicroscopy in clinical ophthalmology without any special extra slit lamp attachments. Objective: To assess clinically of anterior chamber depth in normal adults with Smith-method using slit lamp biomicroscopy. Design: Cross-sectional, analytical study. Participants: 208 normal subjects from the age 18 in different years-group were enrolled in this study (visual acuity mesured with Snellen chart ≥7/10, no other ocular pathology). Methods: Alternately triplicated anterior chamber depth measurements with Smith method, A-scan ultrasonography and IOL Master in 208 normal subject's right eye.