What happens to the stroma if the endothelium fails to perform its pumping function?

When the endothelium fails to perform its pumping function, the stroma can become cloudy due to an accumulation of fluid and possibly other substances. The endothelium of the cornea is essential for maintaining proper hydration levels by pumping out excess fluid from the stroma. When this function is impaired, fluid can build up in the stroma, leading to edema. The presence of excess fluid disrupts the arrangement of collagen fibers within the stroma, which is critical for transparency. This cloudiness can impair vision and is a common indication of endothelial dysfunction. Thus, the correct answer is linked to the physiological effects of fluid balance regulated by the endothelium on the clarity of the stroma.