Final answer:
The most common eye-related complication of congenital CMV infection is progressive retinitis, potentially causing blindness.
Step-by-step explanation:
The most common eye-related complication of congenital CMV (cytomegalovirus) infection is progressive retinitis which can lead to blindness. CMV is a significant pathogen in various populations, especially in immunocompromised hosts and neonates. While many congenital CMV infections remain asymptomatic, the virus can cause severe damage if it crosses the placental barrier during the embryonic stage, affecting developing body systems. In terms of eye complications, CMV can lead to an inflammation and scarring of the retina, eventually resulting in the loss of vision or complete blindness if left untreated.