The standard 20-20 eye exam does not test any eye movements, including eye tracking. Fortenbacher on the VisionHelp blog, the optometric testing of visual tracking is usually broken down into two general categories: Qualitative chairside observation and Quantitative (measurable) standardized tests. Many patients won't be able to see exactly how they track until they see a Developmental Optometrist who specifically tests for that. This kind of tracking leads to the symptoms above. What you're seeing in the above example is the eyes attempting to track the words but not catching all of the words or needing to go back because they missed a word. This is a great animated representation, provided on the Neuro Optometric Rehabilitation Association website, of a visual tracking disorder: Reading the words backwards either with reading out loud or reading in their head.Headaches when doing close up work such as homework or reading.Attention and/or behavior problems specifically during reading or other close vision work.Seemingly careless errors during close work.Excessive head movement while reading, writing or doing other close work.Habit of using a finger or marker or ruler as an aid during reading.Confusing one word with another as the eyes skip around during reading.Frequent drowsiness or sleepiness following short periods of reading.Frequent loss of place and/or skipping lines while reading.Signs and Symptoms of visual tracking problems: Without the brain understanding where the eyes need to be placed, the brain then starts to adapt the position of the eyes on the page as you will see below. The eyes have muscles to help move them in the positions that we need as the brain directs that movement. Good visual tracking is essential to proper comprehension of reading material. In general, this refers to the ability to quickly and accurately look (fixate), visually follow a moving object (pursuit), and efficiently move our eyes so we can fixate on objects from point to point as in reading (saccades). Visual Tracking relates to eye movement ability and is also known in the optometric literature as “ocular motility” or “oculomotor function”.
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