Fig. 1

For Whitnall’s distance measurement, first the fat was pushed back by placing a desmarres and then using a caliper, the distance between Whitnall’s ligament and the upper lid margin was measured (A). Then, the eyelid was turned back, and the T-length was measured from the inside of the eyelid using a caliper (B). By subtracting the second distance from the first, W-distance was obtained