Why Does Diabetes Threaten Your Eyes?

To understand the danger, we must go back to the basics of diabetes: a prolonged high level of sugar (glucose) in the blood. This chronic hyperglycemia acts as a slow poison for the blood vessels throughout the body, especially the finest and most fragile ones, like those inside your eyes.

Imagine your blood vessels as tiny pipes. Excess sugar damages them, weakens them, and can block them. The eye, and specifically the retina, is an organ extremely rich in these small vessels. When blood circulation is poor, the retina no longer receives the oxygen and nutrients it needs to function correctly.

This process is sneaky, as it often happens without any pain or visible symptoms for years. By the time the first signs of vision loss appear, the damage is sometimes already well-advanced. This is why prevention and screening are the cornerstones of protecting your eye health if you have diabetes.

The Main Eye Complications of Diabetes

Diabetes can cause several serious eye diseases. It's important to know about them to better understand what's at stake with medical follow-ups.

Diabetic Retinopathy: The Most Common Threat

This is the most well-known and feared eye complication of diabetes. Diabetic retinopathy directly affects the retina, the thin membrane at the back of the eye that captures light and turns it into a nerve signal for the brain. Without a healthy retina, there is no vision.

There are generally two stages:

1. Non-proliferative retinopathy: This is the first stage. The walls of the retina's blood vessels weaken and can leak fluid or blood. This causes the retina to swell. At this stage, vision is often not yet affected, but the damage is present.
2. Proliferative retinopathy: This is the more advanced and dangerous stage. To compensate for the blockage of old vessels, the retina tries to create new blood vessels. Unfortunately, these "neovessels" are abnormal, very fragile, and can easily bleed into the eye (vitreous hemorrhage), causing sudden vision loss. They can also lead to a detached retina, a medical emergency that can lead to blindness.

Diabetic Macular Edema (DME)

DME is a common consequence of diabetic retinopathy. The macula is the small central area of the retina responsible for the sharp, clear vision we use for reading, recognizing faces, or driving. When blood vessels leak, fluid can accumulate in the macula, causing it to swell. This is called an edema.

A macular edema leads to blurry or distorted central vision. Straight lines may appear wavy. Without treatment, this vision loss can become severe and highly disabling in daily life.

Cataracts and Glaucoma: Increased Risks

Diabetes doesn't just attack the retina. It also increases the risk of developing other well-known eye diseases.

• Cataracts: This is the clouding of the crystalline lens, the eye's natural lens. While cataracts are a normal part of aging, they often appear earlier and progress more quickly in people with diabetes. Excess sugar in the blood can accumulate in the lens and speed up its aging process.
• Glaucoma: This disease is characterized by an increase in pressure inside the eye, which gradually damages the optic nerve, the "cable" that connects the eye to the brain. In diabetics, the formation of abnormal new vessels (as in proliferative retinopathy) can block the normal drainage of fluid from the eye, thus increasing intraocular pressure and the risk of glaucoma.

What Are the Warning Signs?

The greatest danger of diabetic eye complications is their silence. It's possible to have no symptoms for years. However, when signs do appear, you must see a doctor without delay. Here are the symptoms that should alert you:

• Vision that becomes blurry or cloudy.
• The appearance of dark spots, floaters, or "flying flies" in your field of vision.
• A change in how you see colours, which may appear duller.
• Difficulty seeing at night or in low-light conditions.
• Dark or "empty" areas in your visual field.
• Vision that fluctuates throughout the day.

Be careful: never wait for these symptoms to appear before taking action. Preventive follow-up is the only guarantee for protecting your sight in the long run.

Prevention: Your Best Weapon to Protect Your Sight

Blindness from diabetes is not inevitable. By adopting the right habits, you can significantly reduce the risks and preserve your vision. The strategy rests on two inseparable pillars.

Strict Control of Your Diabetes

This is the foundation of everything. Good eye health starts with good management of your disease. By working hand in hand with your primary doctor, you should aim for:

• Good control of your blood sugar: Keeping your blood sugar level as close to normal as possible is the best way to protect your blood vessels.
• Control of your blood pressure: High blood pressure is a major risk factor that adds to diabetes and accelerates damage to the eyes.
• Management of your cholesterol levels: An excess of fats in the blood can also contribute to blocking the vessels.

A balanced diet, regular physical activity, and following your medical treatment are your best allies.

Regular Eye Exams: A Non-Negotiable Appointment

Even if your vision seems perfect, an annual eye exam is essential for anyone with diabetes. Only a professional can detect the first signs of complications, long before you notice them.

This exam usually includes a dilated fundus exam. For this, the optician or ophthalmologist puts drops in your eyes to dilate your pupils. This allows them to get a detailed look at your retina, blood vessels, and optic nerve. It is a painless but essential exam to "photograph" the health of your eyes.

As a first step, our opticians at Lapaire shops, present in several African countries like Côte d'Ivoire, Mali, and Uganda, offer you a comprehensive and free vision test. This is an essential first step to assess your visual acuity and detect any signs that may require the opinion of an ophthalmologist for a more in-depth exam like a dilated fundus exam.

Conclusion

Diabetes poses a serious risk to your visual health, with complications like diabetic retinopathy that can lead to blindness. However, it is crucial to remember that this outcome is largely preventable. The key lies in a dual approach: careful management of your diabetes day-to-day and an annual eye screening, even without symptoms. These two actions combined are your best insurance for preserving your sight.

Don't let diabetes decide for your vision. Take charge. Visit one of our Lapaire branches to get your free vision test. It's simple, fast, and it's the first step to preserving the precious gift of sight.

This article is for informational purposes. For a personalized diagnosis, consult a Lapaire optician.