the segment for reading glasses

[Jaylee Eyeglasses]

I have segment 18 mm on my prescription, and for reading only use, i need to consider this height for my new reading eyeglasses. Today, i placed a new order at site Prescriptionglassesonline.net, and left the comment included the segment information, i hope it will help their technicians can understand my prescription clearly. I am waiting for my new eyeglasses hopefully.