Certified Ophthalmic Assistant Practice Exam

When a patient complains of diplopia, why is it important to ask if the second image goes away after closing one eye?

1. To determine the presence of an eye disease

2. To evaluate the need for glasses

3. To determine the type of diplopia the patient is experiencing

4. To assess for potential neurological issues

The correct answer is: To determine the type of diplopia the patient is experiencing

Understanding whether the second image disappears when one eye is closed is crucial in determining the type of diplopia a patient is experiencing. Diplopia, or double vision, can be classified into two primary types: horizontal or vertical and can also be characterized as binocular or monocular. If the double vision resolves when one eye is closed, this indicates that the diplopia is binocular, usually resulting from misalignment of the eyes or dysfunction of the extraocular muscles. In contrast, if the double vision persists regardless of eye closure, it may suggest that the diplopia is monocular, often arising from issues such as cataracts or problems within the eye itself, like retinal abnormalities. By identifying the type of diplopia, healthcare providers can narrow down potential causes and direct further assessment and management effectively. This differentiation is vital for forming an accurate diagnosis and implementing an appropriate treatment plan, whether the underlying issue is ocular or neurological.