# Can Diabetes Affect the Eyes?

Source page: https://www.kudretgozistanbul.com/en/blog/eye-diseases/can-diabetes-affect-the-eyes

**Author:** Kudret Eye İstanbul | **Medical Approval:** Op. Dr. Mehmet Ali Özdil | **Date:** 2026-09-04

> **Summary:** Diabetes that is poorly controlled over a long period can damage the eyes, mainly through diabetic retinopathy, and also raises the risk of cataract and glaucoma. Blood sugar control and regular eye examinations allow problems to be caught early, before they can lead to sight loss.

## Quick Facts
- **Main eye problem:** Diabetic retinopathy (damage to retinal blood vessels)
- **Other conditions:** Cataract (can appear at an early age), glaucoma
- **Recommended check-ups:** A detailed eye examination at least once a year, or more often if the doctor advises
- **Advanced treatments:** Intraocular injections, laser treatment, vitrectomy
- **Higher risk:** People who have had diabetes for a long time

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## How Diabetes Affects the Eyes
Long-term high blood sugar weakens the thin vessel walls in the retina and can cause blockage, leakage and bleeding (retinopathy). High blood pressure accompanying diabetes can increase this vessel damage. Without early diagnosis and treatment, permanent sight loss or, at advanced stages, blindness can develop.
- **Diabetic retinopathy:** the most common eye problem in diabetes; retinal vessels are damaged and can bleed.
- **Glaucoma:** raised pressure inside the eye damages its inner structures and the optic nerve.
- **Cataract:** far more likely in diabetes and can appear at an early age.

## Warning Signs
Early retinopathy often gives no symptoms. Later signs include:
- Change in colour contrast or colour perception, colours looking pale
- Blurred vision
- Dark or blind spots in the field of vision
- Falling visual acuity, difficulty seeing at distance or near

## Prevention and Measures
- Check blood sugar regularly and balance it with medication or diet.
- Have regular blood tests and follow the doctor's instructions.
- Control blood pressure and cholesterol as well.
- Attend eye examinations regularly and start treatment at once if a problem is found.

## Treatment of Diabetic Retinopathy
Treatment depends on the stage and severity of the condition and the patient's situation.
- **Early stage:** good blood sugar control and regular eye examinations or follow-up are often enough.
- **Advanced stage:** intraocular injections, laser treatment and in some cases vitrectomy surgery.

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## Frequently Asked Questions

**Q: Does diabetes affect the eyes?**
A: Yes, diabetes poorly controlled over a long period can. Diabetic retinopathy, diabetes-related cataract and glaucoma are the most common problems; regular eye examinations and blood sugar monitoring reduce the risk considerably.

**Q: What are the symptoms of diabetic retinopathy?**
A: Often none early on. Later: blurred vision, dark or blind spots, pale colours or reduced visual acuity. Regular examinations are needed even without symptoms.

**Q: How often should people with diabetes have eye check-ups?**
A: A detailed eye examination at least once a year; the doctor may shorten the interval depending on blood sugar control and eye findings.

**Q: Does diabetic retinopathy lead to complete blindness?**
A: If untreated and advanced, it can cause serious sight loss. Early diagnosis, good diabetes control, regular examinations and treatments such as laser, injections or vitrectomy reduce that risk considerably.

**Q: How is diabetic retinopathy treated?**
A: The basis is control of blood sugar, blood pressure and cholesterol. Early stages may need only follow-up; advanced stages may need intraocular injections, laser or vitrectomy, decided by the ophthalmologist based on findings at the back of the eye.