Which condition can lead to blurry vision and represents retinal damage?

Drusen refers to small yellow or white bumps that develop on the retina and are composed of lipid deposits. They are commonly associated with age-related macular degeneration (AMD), a condition that can lead to retinal damage and vision problems, including blurry vision. The presence of drusen indicates a change in the retinal structure and can be an early sign of AMD, which affects central vision and can significantly impair visual acuity over time.

In contrast, cotton wool patches are indicative of retinal ischemia but do not directly cause retinal damage or blurry vision in the same way that drusen does. Glaucoma primarily affects the optic nerve and leads to peripheral vision loss rather than direct retinal damage, while astigmatism is a refractive error caused by an irregularly shaped cornea or lens, leading primarily to blurry vision due to light not focusing properly on the retina.

Therefore, since drusen directly represents a condition that signals potential retinal damage and results in blurry vision, it is the accurate choice for the question presented.