VT for Eye Movement Disorders: Fixations and Pursuits Flashcards
Fixation assessment is not standardized. The SCCO 4+ system requires that a patient fixate a 20/80 target. What test results would indicate a failure of this test?
Fixation for less than 5 seconds, or needing proprioceptive support.
The primary goal of fixation training is to direct attention, and then fovea, to a detailed, static target. How is a McDonald chart used to help train fixation?
The chart is composed of letters of increasing Snellen acuity size, radiating out from a central letter. The patient should be able to identify the other letters on the chart without taking their eyes off the central letter.
True or false: it is common for pursuit dysfunction to occur by itself.
False; it is rare for it to exist by itself. It will likely include saccadic and accommodation and/or vergence dysfunction.
What is the core requirement of pursuit training?
Predictable relative motion.
Between head movement and target movement, which is easiest in terms of pursuits?
Head movement
Place the following target descriptors in order of increasing pursuit difficulty:
Small target, no detail
Thumb
Large target, no detail
Small target, central detail
Thumb (easiest)
Large target, no detail
Small target, no detail
Small target, central detail (hardest)
If there is an extreme pursuit issue, what would be the main question to determine whether the problem is acquired, or whether it is a developmental lag?
Is the problem getting worse, or has it never been good, even in the first place?
True or false: giving a patient a paper maze and having them draw their way through it is a good pursuit task.
False; this is not a pursuit task, since the eyes are leading the pencil.
What is the most important goal for the patient during a pursuit training task?
Accuracy. Speed and duration can come later, as can minimization of head movement.
