DetailsHamilton-Veale Reading Tracking Guide Hamilton-Veale Eye Tracking Guides Eye tracking is a very important modality. Both eyes need to follow along a line of words in unison. If there is a Nystagmus, field loss, Microscotoma or poor ocular coordination, tracking can be compromised. A tracking guide placed below the line of print to be read, or under a line of numbers, can stabilise saccades and tracking. These guides are supplied in groups of 20.