How to Measure for Eyes Measure the bisque eye sock from the inside corner to the outside corner, as shown in the diagram. If you have a set of wooden eye sizers, keep placing the rounded end into the socket from the inside of the head until the rounded end fits the eye without leaving gaps.   Eye Measurement Tool To make a handy measurement tool, cut a piece of plastic from a margerine tub lid (or the cardboard that you get in a package of pantyhose) into a 4" x 4" square. Cut this square diagonally into 2 equal triangles. Place the pointed end of the triangle into the bisque-fired doll's eye socket until the triangle touches the edges of the socket. Mark both edges of the plastic at this spot. Measure between the marks on the cardboard and convert the inches to millimeters and you have the correct eye size. Eye Measurement Tip If you measure your soft-fired ware, the final eye size will be approximately two sizes smaller. It's handy to keep a set of inexpensive eyes, sized for the soft-fired head, to use for measuring purposes. You can then check the eye fit and make adjustments before the head is fired. 4 inches = approximately 102 mm Inches to Millimeters (mm) number of inches x 25.4 = millimenters Millimeters to Inches (") number of millimeters x 0.03937 = inches (") Celisus (C) to Fahrenheit (F) degree F = (degree C x 1.8) + 32 Fahrenheit (F) to Celisus (C) degree C = (degree F - 32) x .5555555