Reviewed by: Scot C. Holman, MD, Board-Certified Laser Cataract & Lens Replacement and Corneal Surgeon
Yes, diabetes can increase your risk of developing cataracts and may cause them to appear at an earlier age. Persistently high blood sugar can affect the eye’s natural lens and contribute to clouding. People with diabetes also need to watch for other eye conditions, particularly diabetic retinopathy, which affects the retina rather than the lens.
Diabetes affects an estimated 40.1 million people in the United States, or 12.0% of the population, according to current CDC data. Managing diabetes matters for your overall health and for protecting your vision.
People with diabetes are at an increased risk of developing numerous conditions, including those linked to eye health. Prevalent eye conditions can be diabetic retinopathy, diabetic macular edema, glaucoma, and, most commonly, cataracts. That’s why diabetic eye exams are so strongly recommended by healthcare professionals.
The good news is that regular eye examinations can help detect diabetes-related eye changes before they significantly affect vision. Understanding which condition is causing a visual change also helps your eye doctor recommend the right treatment.
Table of Contents
Does Diabetes Cause Cataracts?
Yes. If you are wondering, does diabetes cause cataracts? The answer is that diabetes can significantly increase cataract risk, although it is not the only cause. Cataracts also commonly develop with age. According to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), people with diabetes are about twice as likely to develop cataracts as people without diabetes and may develop them at an earlier age.
A cataract forms when the normally clear lens inside the eye becomes cloudy. The lens helps focus light onto the retina so you can see a sharp image. Diabetes can affect this process because elevated blood glucose changes the eye’s internal environment.
High glucose can alter fluid levels in the focusing tissues and temporarily blur vision. Over time, persistently elevated glucose is also associated with changes and deposits in the lens that contribute to cataract formation. This differs from diabetic retinopathy, where prolonged high blood sugar damages the small blood vessels in the retina at the back of the eye.
In simple terms:
- Cataracts cloud the eye’s lens.
- Diabetic retinopathy affects the retina’s blood vessels.
- Diabetes increases the risk of both conditions.
- A person can have cataracts and diabetic retinopathy at the same time.
This distinction matters because blurry vision in someone with diabetes is not automatically caused by cataracts. Temporary blood sugar fluctuations, diabetic retinopathy, diabetic macular edema, glaucoma, and other conditions can also affect vision. A comprehensive eye examination is the best way to determine the cause.
How Can You Reduce Your Risk of Cataracts With Diabetes?
You cannot eliminate every cataract risk factor, particularly aging, but managing diabetes and protecting your overall eye health can help reduce the risk of diabetes-related complications.
How Does Blood Sugar Management Help Protect Your Eyes?
Keeping your blood sugar within the target range set by your diabetes care team is a key part of managing diabetes. Follow your healthcare provider’s recommendations regarding medication, insulin, nutrition, physical activity, and blood glucose monitoring.
Avoid making major changes to diabetes medication or insulin specifically for eye health without consulting the clinician managing your diabetes.
Why Are Regular Diabetic Eye Exams Important?
Diabetic eye exams are essential for early detection and monitoring of diabetic retinopathy and other eye conditions. They also let your eye doctor check the lens for cataract development and determine whether vision changes have another cause.
Because several diabetes-related eye conditions can develop before noticeable symptoms appear, waiting until your vision changes is not the safest approach.
What Lifestyle Choices Can Support Eye Health?
Adopting a healthy lifestyle can support diabetes management and overall eye health. Focus on a balanced eating pattern appropriate for your diabetes care plan, along with regular physical activity, weight management when recommended, and avoiding smoking.
A healthy lifestyle also includes protecting your eyes from the sun’s harmful ultraviolet (UV) rays. Wear UV-protecting sunglasses outdoors, and consider wearing wide-brimmed hats for added shade on extra sunny days.
What Cataract Symptoms Should People With Diabetes Watch For?
Cataracts usually develop gradually, so early changes can be easy to overlook. People with diabetes should watch for persistent vision changes and avoid assuming blurry vision is simply due to fluctuating blood sugar.
Diabetic Cataract Symptom Checklist
Schedule an eye examination if you begin noticing one or more of these changes:
- Cloudy, blurry, or hazy vision that persists
- Colors appearing faded or less vivid
- Increasing sensitivity to bright light or glare
- Halos around headlights or other lights
- Greater difficulty seeing or driving at night
- Needing brighter light to read
- Frequent changes to your glasses or contact lens prescription
- Double vision in one eye
- Difficulty distinguishing objects in low-contrast conditions
Some of these symptoms can also occur with other eye conditions. People with diabetes should report new or worsening vision changes to an eye care professional rather than trying to identify the cause based on symptoms alone.
How Are Cataracts Treated in People With Diabetes?
Early cataracts do not always require surgery right away. Updated glasses, improved lighting, glare reduction, and monitoring may help when symptoms remain mild. Surgery is generally considered when cataracts begin interfering with daily activities and nonsurgical measures can no longer provide adequate vision.
When Might Cataract Surgery Be Recommended?
If cataracts progress enough to interfere with functional vision, your ophthalmologist may recommend surgery. During cataract surgery, the cloudy natural lens is removed and replaced with an artificial intraocular lens (IOL).
Laser cataract surgery uses computer-guided femtosecond laser technology to assist with selected steps of the operation. Traditional cataract surgery is another established option. Your surgeon can choose the technique that best fits your eye health and treatment goals.
After removing the cataract, the surgeon implants an artificial intraocular lens (IOL) in place of the natural lens to help focus light.
For people researching cataract surgery for diabetic patients, preoperative assessment is especially important because the ophthalmologist must evaluate the retina, macula, blood vessels, and other structures, not just the cataract itself.
To understand the technology used during laser-assisted procedures, read our guide to advanced laser cataract surgery.
What Happens After Cataract Surgery?
After cataract surgery, the next step is to follow up with your doctor for post-operative care. Attend all remaining appointments, use prescribed eye drops as directed, and protect your eyes from injury and infection as they heal.
Patients with diabetes may need additional retinal monitoring depending on their existing diabetic eye disease and individual risk factors. Follow the postoperative schedule your cataract surgeon and diabetes care team recommend.
Is Cataract Surgery Safe for Diabetics?
Yes, people with diabetes can undergo cataract surgery, and many experience meaningful improvement in vision. However, cataract surgery for diabetic patients requires careful planning because diabetes may affect the retina, macula, blood vessels, and healing response.
Before surgery, your ophthalmologist will want to understand your eye’s overall health, not just the severity of the cataract. Existing diabetic retinopathy or diabetic macular edema can influence the expected visual result and may require additional monitoring or treatment.
Blood sugar management also matters around surgery. Your cataract surgeon and the clinician managing your diabetes can advise you about medications, glucose monitoring, and other precautions before and after the procedure. Do not change insulin or diabetes medications without medical guidance.
Having diabetes does not automatically mean you cannot have cataract surgery. Instead, your individual eye health and diabetes-related complications help determine the timing, treatment plan, and follow-up care.
Diabetic Retinopathy vs. Cataracts: What’s the Difference?
Cataracts and diabetic retinopathy can both cause vision problems in people with diabetes, but they affect completely different parts of the eye.
| Factor | Cataracts | Diabetic Retinopathy |
| Part of the eye affected | Natural lens at the front of the eye | Retina and its blood vessels at the back of the eye |
| What happens | The normally clear lens becomes cloudy | High blood sugar damages small retinal blood vessels, which may leak, swell, or develop abnormal new vessels |
| Common visual effects | Cloudy or blurry vision, glare, faded colors, halos, and difficulty seeing at night | May initially have no symptoms; later changes can include blurred vision, floaters, dark areas, or vision loss |
| Treatment | Monitoring in early stages and cataract surgery when vision becomes significantly affected | Depends on severity and may include monitoring, injections, laser treatment, or retinal surgery |
| Can they occur together? | Yes | Yes |
A cataract can sometimes make it harder for the ophthalmologist to clearly examine the retina. Conversely, significant diabetic retinopathy or macular edema may limit how much vision improves after cataract removal. That is why it’s important to evaluate both the lens and retina before surgery.
For more information about retinal conditions, read our guide to common retinal diseases.
How Often Should Diabetics Get Eye Exams?
Eye-exam timing depends on the type of diabetes and whether diabetic retinopathy is already present. Current American Diabetes Association guidance recommends that adults with type 1 diabetes receive an initial dilated comprehensive eye examination within five years after diabetes begins. People with type 2 diabetes should receive one at the time of diagnosis.
After that, the frequency of examinations should be individualized. If one or more annual examinations show no retinopathy and blood glucose indicators are within the target range, screening every one to two years may be considered. If diabetic retinopathy is present, dilated retinal examinations should generally occur at least annually. Progressive or sight-threatening retinopathy may require more frequent examinations.
Your ophthalmologist may recommend a different schedule based on your retinal findings, blood sugar control, pregnancy status, vision changes, or other risk factors.
How Are Diabetic Cataracts Different From Age-Related Cataracts?
Diabetes and aging can both contribute to cataract formation, and a person may have more than one risk factor. The key difference is that diabetes increases cataract risk and can cause cataracts to develop at a younger age.
| Factor | Diabetic Cataracts | Age-Related Cataracts |
| Primary association | Diabetes and prolonged exposure to elevated blood glucose | Natural changes in the eye’s lens associated with aging |
| Typical timing | Can occur at a younger age in people with diabetes | Becomes increasingly common with advancing age |
| Progression | May develop or progress differently depending on metabolic control and other individual factors | Often develops gradually over time |
| Other eye concerns | Diabetic retinopathy and diabetic macular edema may also be present | Other age-related eye conditions may coexist |
| Evaluation before surgery | Requires careful assessment of the retina, macula, diabetes-related eye disease, and overall ocular health | Requires a comprehensive evaluation of the eye and any coexisting conditions |
| Treatment when visually significant | Cataract surgery may be recommended when appropriate | Cataract surgery may be recommended when appropriate |
The cataract itself is still a clouding of the natural lens in either situation. The difference lies primarily in the risk factors, age of onset, and additional eye-health considerations that can accompany diabetes.
Key Takeaways
- Diabetes increases the risk of cataracts and can cause them to develop at an earlier age.
- Cataracts affect the eye’s natural lens, while diabetic retinopathy damages retinal blood vessels. A person can have both conditions at the same time.
- Persistent blurry vision shouldn’t automatically be blamed on cataracts because changes in blood sugar and retinal disease can also affect vision.
- Regular comprehensive eye exams matter because diabetic eye disease may develop before noticeable symptoms appear.
- Cataract surgery can be an option for people with diabetes, but retinal health, macular health, blood sugar management, and other factors need to be considered when planning treatment.
Closing Words
So, does diabetes cause cataracts? Diabetes doesn’t cause every cataract, but it significantly increases the risk and can cause cataracts to appear earlier in life. At the same time, diabetes can affect several other structures in the eye, so regular comprehensive exams are especially important.
Managing blood sugar, following your recommended eye-exam schedule, and reporting persistent vision changes can help your care team identify cataracts and other diabetes-related eye conditions as early as possible. If a cataract begins interfering with everyday vision, your ophthalmologist may consider cataract surgery after evaluating your cataract, retina, macula, and overall eye health.
How Can a Diabetic Eye Doctor Help Protect Your Vision?
At Lake Eye Associates, our advanced diabetic eye exams closely examine the structures that support your vision. A comprehensive evaluation can help identify cataracts, diabetic retinopathy, and other diabetes-related eye changes while giving your eye doctor the information needed to recommend appropriate monitoring or treatment.
With eye care and surgical services available at multiple Central Florida locations, including Wildwood, The Villages, Lady Lake, Tavares, and Leesburg, you can choose the Lake Eye Associates location most convenient for you.
If you have diabetes, proactive eye care can play an important role in protecting your sight.
Book an appointment with Lake Eye Associates to have your eye health evaluated and discuss the next steps for your vision.
Medical disclaimer: The information provided in this blog is intended for general informational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition.
Frequently Asked Questions
1. Does diabetes cause cataracts at a younger age?
Yes. People with diabetes are more likely to develop cataracts and may develop them earlier than people without diabetes. Long-term exposure to elevated blood glucose is associated with changes in the eye’s natural lens.
2. Can lowering blood sugar make an existing cataract disappear?
No. Better blood sugar management may temporarily improve vision changes caused by fluctuating glucose, but it cannot reverse a cataract once the lens has become permanently cloudy.
3. Can diabetes cause blurry vision without cataracts?
Yes. High or changing blood glucose can temporarily affect focusing and cause blurry vision. Diabetic retinopathy, diabetic macular edema, glaucoma, and other eye conditions can also affect vision.
4. Can I have cataract surgery if I also have diabetic retinopathy?
Possibly. Having diabetic retinopathy does not automatically prevent cataract surgery, but its severity can affect treatment planning, timing, follow-up care, and the amount of vision you may gain after surgery.
5. Will cataract surgery cure diabetic retinopathy?
No. Cataract surgery removes the cloudy natural lens but does not treat retinal blood vessel damage caused by diabetes. Diabetic retinopathy may require separate monitoring or treatment by an eye care professional.
