Which of the following eye conditions must a medical examiner inquire about during the exam?

During the medical examination for commercial drivers, it is crucial to inquire specifically about glaucoma. This eye condition is particularly important because it can lead to significant vision loss if left untreated. Glaucoma often develops without noticeable symptoms in its early stages, making it essential for medical examiners to ask about it to ensure the driver is not at risk of impaired vision that could compromise driving safety.

In contrast, while astigmatism, conjunctivitis, and presbyopia are all eye conditions that may affect vision, they do not carry the same level of potential risk for sudden vision loss or serious impairments that can impact driving ability. Astigmatism is generally correctable with lenses, conjunctivitis is typically temporary and rarely affects the ability to drive safely, and presbyopia, a natural age-related vision change, can usually be managed with corrective eyewear. Therefore, the focus on glaucoma is warranted due to its serious implications for a driver's vision and overall safety on the road.