How does diabetic retinopathy primarily cause vision loss?

How does diabetic retinopathy primarily cause vision loss?

• A. By increasing intraocular pressure
• B. By accelerating lens aging
• C. By causing fluid buildup in the retina
• D. By detaching the retina

Answer: (C)

In diabetic retinopathy, vision loss mainly comes from fluid leaking into the retina, causing macular edema. High blood glucose over time damages the tiny retinal blood vessels and weakens the blood-retinal barrier. When these vessels leak, fluid and lipids accumulate in the retinal layers, thickening the retina. When this swelling affects the macula—the central part of the retina responsible for sharp vision—central vision becomes blurred or distorted, which is the most common and impactful way vision deteriorates in this condition. Other issues, like increased eye pressure, cataracts, or a detached retina, can also affect vision, but they are not the primary mechanism by which diabetic retinopathy reduces vision. The edema driven by vascular leakage is the key process behind the central vision loss seen in this disease. Treatments aim to reduce the edema (for example, with anti-VEGF injections or laser therapy) and to manage systemic factors like blood sugar and blood pressure to protect the retina.

In diabetic retinopathy, vision loss mainly comes from fluid leaking into the retina, causing macular edema. High blood glucose over time damages the tiny retinal blood vessels and weakens the blood-retinal barrier. When these vessels leak, fluid and lipids accumulate in the retinal layers, thickening the retina. When this swelling affects the macula—the central part of the retina responsible for sharp vision—central vision becomes blurred or distorted, which is the most common and impactful way vision deteriorates in this condition.

Other issues, like increased eye pressure, cataracts, or a detached retina, can also affect vision, but they are not the primary mechanism by which diabetic retinopathy reduces vision. The edema driven by vascular leakage is the key process behind the central vision loss seen in this disease. Treatments aim to reduce the edema (for example, with anti-VEGF injections or laser therapy) and to manage systemic factors like blood sugar and blood pressure to protect the retina.