Final answer:
Age-related macular degeneration (AMD) is the most common cause of blindness in adults in the USA, which occurs due to the degeneration of the macula, affecting millions of Americans. There is currently no cure for this condition, and it usually affects individuals as they age. the correct option is C. Macular degeneration.
Step-by-step explanation:
The most common cause of adult blindness in the USA is C. Macular degeneration. It's known as age-related macular degeneration (AMD), affecting millions. Age-related macular degeneration (AMD) is the leading cause of adult blindness in the United States. Approximately 15 million Americans are affected by AMD, a condition characterized by the deterioration of the macula, a small area in the center of the retina responsible for sharp, straight-ahead vision.
AMD occurs when these cells die, leading to a lack of support and nutrition to the macula, causing it to degrade. As the condition progresses, the central vision develops a black spot which increases in size, significantly impairing the person's ability to see details. Other common vision issues like myopia and hyperopia emerge in earlier life stages, while AMD typically happens with advancing age. AMD does not have a cure at present, making it a significant public health concern.