## **Core Concept**
Primary open-angle glaucoma (POAG) is a chronic condition characterized by the progressive loss of retinal ganglion cells and their axons, leading to optic neuropathy. It is associated with an open anterior chamber angle and typically presents with elevated intraocular pressure (IOP). The incidence of POAG increases with age, particularly in populations over 40 years of age.

## **Why the Correct Answer is Right**
The correct answer, , indicates that the incidence of primary open-angle glaucoma in the population over 40 years of age is about 1-2%. This is consistent with epidemiological studies that have shown a significant increase in the prevalence and incidence of POAG with advancing age. The condition is one of the leading causes of irreversible blindness worldwide, and its early detection is crucial for preventing vision loss.

## **Why Each Wrong Option is Incorrect**
* **Option A:** is lower than the generally reported incidence of POAG in the population over 40 years of age.
* **Option B:** seems closer but still might not accurately reflect the commonly cited range for the incidence of POAG.
* **Option D:** appears to be higher than the typically reported incidence for this age group.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that POAG often presents asymptomatically until significant vision loss has occurred. Therefore, screening for POAG, including tonometry to measure IOP and assessment of the optic disc, is recommended for individuals over 40 years of age, especially those with a family history of glaucoma.

## **Correct Answer:** .