**5.2 Capillary density (CD)**

It is the number of capillaries in 1 mm length of the distal row of each finger or toe. A capillary loop is considered to be in the distal row, if the angle between the apex of that capillary loop and the two adjacent capillary loops is more than 90° [5]. Capillary density of more than 9 is usually taken as normal, albeit age-related changes in the parameter [6]. A mean CD for each finger is calculated by analyzing four fields in the same.
