Cover Tests Flashcards
What is the cover test used for?
To detect and differentiate between phorias and tropias
What are the two main types of cover tests?
- Cover-Uncover Test
- Alternate Cover Test
What does the Cover-Uncover Test detect?
Tropias
What is the first step in the Cover-Uncover Test procedure?
Ask the patient to focus on a distant or near target
What does no movement of the uncovered eye indicate in the Cover-Uncover Test?
No tropia
What does movement of the uncovered eye indicate in the Cover-Uncover Test?
Indicates a tropia
If the uncovered eye moves inward to fixate, what type of tropia is indicated?
Exotropia
If the uncovered eye moves outward, what type of tropia is indicated?
Esotropia
What does downward movement of the uncovered eye indicate?
Hypertropia
What does upward movement of the uncovered eye indicate?
Hypotropia
In the Cover-Uncover Test, what does it mean if the same eye consistently shows the deviation?
It’s unilateral
What does it mean if the deviation switches between eyes in the Cover-Uncover Test?
It’s alternating
What does the Alternate Cover Test detect?
Phorias
What is the purpose of the Alternate Cover Test?
To break binocular fusion and reveal latent deviations
What is the first step in the Alternate Cover Test procedure?
Ask the patient to fixate on a target
What does no movement of the uncovered eye indicate in the Alternate Cover Test?
Orthophoria
What does movement upon uncovering indicate in the Alternate Cover Test?
Indicates a phoria
If the uncovered eye moves inward in the Alternate Cover Test, what type of phoria is indicated?
Exophoria
If the uncovered eye moves outward in the Alternate Cover Test, what type of phoria is indicated?
Esophoria
What do vertical movements indicate in the Alternate Cover Test?
Hyperphoria or hypophoria
