Certified Ophthalmic Assistant Practice Exam

Which condition is least likely to cause transient loss of vision?

1. Papilledema

2. Carotid artery disease

3. Thyroid disorder

4. Migraine

The correct answer is: Thyroid disorder

Transient loss of vision can occur due to various conditions related to changes in blood flow or increased intracranial pressure, among others. Thyroid disorders, while they can affect vision in chronic states (such as in Graves' disease leading to thyroid eye disease), are less commonly associated with acute, transient episodes of vision loss. In contrast, papilledema often results from increased intracranial pressure, which can cause temporary visual impairment. Carotid artery disease can lead to transient ischemic attacks (TIAs), sometimes presenting as transient vision loss due to reduced blood flow to the eye. Migraines, particularly those with auras, can cause brief, transient vision changes, including loss of vision. Given this context, thyroid disorders are considered the least likely to cause transient loss of vision when compared to the more typical presentations seen with the other conditions listed.