Diabetes and Your Eyes: What You Need to Know (Especially in the Summer)
Taking care of your eyes is important for everyone, but it matters even more when you live with diabetes. Over time, high blood sugar can affect different parts of your eyes and lead to vision problems. The good news? With the right care, many of these issues can be managed or even prevented.
How Diabetes Affects Your Vision
Your eyes have tiny blood vessels that help bring oxygen and nutrients where they’re needed. When blood sugar stays high for long periods of time, those vessels can become damaged.
Here are the most common ways diabetes can impact your vision:
Diabetic Retinopathy
This is the most common eye condition linked to diabetes.
High blood sugar can damage the small blood vessels in the retina (the back of your eye). These vessels may swell, leak, or even close off. In more advanced stages, new (but weak) blood vessels can grow and cause serious vision loss.
Early stages often have no symptoms, which is why regular eye exams are so important.
Diabetic Macular Edema (DME)
DME can happen when fluid builds up in the macula, the part of your eye responsible for sharp, straight-ahead vision. Symptoms include blurry or wavy vision and colors appearing faded.
Cataracts
A cataract is when the lens of your eye becomes cloudy. There’s a well-established link between diabetes and cataracts, rooted in how elevated blood sugar affects the eye’s natural lens. In people living with diabetes, excess glucose can accumulate in the lens and convert into sorbitol, leading to swelling, protein damage, and clouding over time. These are hallmarks of cataract formation.
As a result, individuals living with diabetes tend to develop cataracts earlier and more frequently than those without the condition. Poor blood sugar control further accelerates this process, making consistent management of glucose levels an important factor in protecting long-term vision.
Glaucoma
Chronically elevated blood sugar can damage small blood vessels throughout the body, including those in the eyes, which may impair drainage of intraocular fluid and raise eye pressure, a key factor in glaucoma. As mentioned, diabetes is associated with diabetic retinopathy, which can lead to abnormal blood vessel growth (neovascularization) that further blocks fluid outflow and contributes to a more aggressive form of glaucoma.
Individuals with diabetes are generally advised to undergo regular comprehensive eye exams to monitor for early signs of glaucoma and other vision-threatening complications.
Temporary Vision Changes
Even short-term spikes or drops in blood sugar can affect your vision. Blurry vision can happen when blood sugar is too high or too low, often improving once levels are back in range.
Signs to Watch For
Reach out to your doctor if you notice blurry or double vision, dark spots or “floaters,” trouble seeing at night, flashes of light, or sudden vision loss. Even small changes are worth checking out.
Checklists: How to Protect Your Eyes (All Year Long)
Managing diabetes well is the first step in protecting your vision.
Daily Habits That Help
- Keep blood sugar in your target range
- Manage blood pressure and cholesterol
- Eat a balanced diet with leafy greens, fruits, and healthy fats
- Stay active
- Don’t smoke
Don’t Skip Eye Exams
Your eye doctor can spot problems early, often before you notice symptoms. So be sure to get a dilated eye exam at least once a year
Extra Eye Protection During Sunny Summer Days
Sun exposure can add extra stress to your eyes. Here’s how to stay protected:
- Wear Sunglasses That Actually Protect Your Eyes. Not all sunglasses are created equal. Look for ones that market 100% UVA and UVB protection. From a style perspective, sunglasses that wraparound help block light from the sides of your face (by your eyes) and polarized lenses to reduce glare (great for driving or being near water).
Brands like Ray-Ban, Oakley, and Maui Jim offer strong UV protection options.
- Wear a Hat for Extra Coverage. A wide-brim hat can block sunlight from above and reduce how much UV reaches your eyes.
- Stay Hydrated. Dry eyes can feel worse in the heat. Drink plenty of water and use artificial tears if your eyes feel dry or irritated.
- Be Careful Around Water and Sand. Sunlight reflects off water, sand, and pavement—making UV exposure stronger. Always wear sunglasses outdoors, even on cloudy days.
- Watch Your Blood Sugar in the Heat. Hot weather can affect your blood sugar levels. Dehydration and heat can cause levels to rise or fall and fluctuations can lead to temporary blurry vision. Check your levels more often when you’re spending time outside.
- Protect Your Eyes While Swimming. Chlorine and saltwater can irritate your eyes so remember to wear swim goggles and rinse your eyes with clean water after swimming.
A Simple Way to Keep Your Future in Focus
Your eyes are closely connected to your overall health. When you take care of your diabetes,
you’re also protecting your vision. Small steps today can make a big difference over time. Stay on top of your eye exams, protect your eyes from the sun, and keep your blood sugar under control. Clear vision is something worth protecting!
Author: Becky Day, RN, CDCES | CCS Health
This site is for educational purposes only. Talk to your doctor or healthcare provider before making any decisions about your health.
