Evaluation of the Lower Punctum Parameters and Morphology Using Spectral Domain Anterior Segment Optical Coherence Tomography

Figure 2

A normal punctum as shown by AS-OCT. (a) Evaluation of shape and contents of the punctal area. (b) Measurement of outer and inner punctal diameters. (c) Measuring the punctal height by drawing a line tangent to the lower lid margin and passing across the punctum, the distance measurement tool is then placed and a perpendicular line is drawn from the tangent line towards the floor of the punctum. (d) Evaluation of the junction between the punctum and the vertical canaliculus (arrow).

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