Which of the following is NOT a symptom associated with diabetic retinopathy?

Diabetic retinopathy is a complication of diabetes that affects the eyes, specifically the retina, and leads to various visual symptoms. Each of the other options represents a common symptom associated with diabetic retinopathy.

Blurred vision can occur as the blood vessels in the retina become damaged, leading to changes in the way light enters the eye. Floaters are often seen as spots or cobweb-like shapes in the field of vision and can be a result of bleeding within the eye or changes in the vitreous gel caused by retinal damage. Dark areas in vision, or scotomas, can arise as areas of the retina are affected, leading to patches of diminished vision.

Color blindness, however, is not a symptom of diabetic retinopathy. It is typically a genetic condition and relates to deficiencies in the color-sensing cells in the retina, the cones, rather than damage or changes caused by diabetic retinopathy. Thus, while diabetic retinopathy can lead to various vision changes, it does not cause color blindness, making it the correct answer to the question.