Diabetes and Dry Eye

Diabetes changes the delicate balance of your tear film, the thin layer of moisture that coats your eye surface. When your blood sugar stays elevated, it triggers widespread inflammation throughout your body, including in the tiny glands around your eyes. This inflammation interferes with normal tear production and quality. Research shows that people with diabetes have significantly higher rates of dry eye compared to those without diabetes, with some studies reporting dry eye in more than half of diabetic patients.

The meibomian glands in your eyelids produce oils that prevent tears from evaporating too quickly. Chronic high blood sugar damages these glands and can also harm the lacrimal glands that make the watery part of your tears. This damage leads to meibomian gland dysfunction, one of the most common causes of evaporative dry eye. Elevated glucose levels cause oxidative stress in gland cells, reducing both the quality and quantity of tear components. As these glands become impaired, the protective oil layer becomes thinner and less stable, allowing tears to evaporate much faster than normal.

Nerve damage from diabetes does not just affect your hands and feet. It can also reduce sensation in your cornea, the clear front surface of your eye. When your cornea loses sensitivity, you may blink less often without realizing it. Blinking spreads tears evenly across your eye, so fewer blinks mean your eyes dry out faster and feel more uncomfortable. This reduced corneal sensitivity is a hallmark of diabetic eye complications and can progress over time, especially if diabetes duration exceeds ten years.

Some drugs used to manage diabetes and related conditions can make dry eye worse. Our ophthalmologists need to know all the medications you take so we can account for their effects on your tear film. Common medications that may contribute to dry eye include anticholinergics used for overactive bladder or digestive conditions, antidepressants such as SSRIs and tricyclics, beta blockers and thiazide diuretics for blood pressure, antihistamines and decongestants that dry out mucous membranes, and some topical glaucoma drops containing preservatives like benzalkonium chloride. SGLT2 inhibitors can increase urination and contribute to dehydration, which may worsen dry eye symptoms. Do not stop any medication on your own. We will coordinate with your prescribing doctor if changes are needed.

Most people with diabetes-related dry eye start with over-the-counter lubricating eye drops. We typically recommend preservative-free formulas, especially if you need to use drops more than four times per day. Preservatives like benzalkonium chloride can irritate your already compromised eye surface and worsen symptoms over time. Use drops whenever your eyes feel dry or uncomfortable, and try different brands to find what works best for you. Keep a bottle at home, at work, and in your bag so drops are always available. Use a lubricating gel or ointment at bedtime for nighttime dryness, as these thicker formulations provide longer-lasting protection. Avoid redness-relief drops that constrict blood vessels, as these do not treat the underlying problem and can make dry eye worse with regular use.

When over-the-counter drops are not enough, we may prescribe medications that address the underlying inflammation or boost your natural tear production. These treatments work differently than simple lubricants and target the root causes of dry eye. Cyclosporine and lifitegrast are anti-inflammatory drops that help calm the immune response on your eye surface and improve tear quality over time. Another option, varenicline nasal spray, stimulates tear production by activating trigeminal nerves. You spray it into each nostril twice daily, and common effects include sneezing, cough, or throat irritation. These medications typically take several weeks to show full benefit, so patience and consistent use are important. Short courses of low-dose topical corticosteroids may be used to control flares or to bridge until prescription immunomodulatory drops take effect. These require monitoring due to potential side effects like increased eye pressure and cataract formation. Additional options include perfluorohexyloctane eye drops for evaporative dry eye caused by meibomian gland dysfunction, and therapies such as oral doxycycline or topical azithromycin when appropriate to reduce lid inflammation.

Your tears normally drain through tiny openings called puncta in the inner corners of your eyelids. We can insert small plugs into these drainage holes to help tears stay on your eyes longer, improving moisture and comfort. Punctal plugs are a good option when your eyes do not make enough tears or when tears drain away too quickly. We usually try temporary plugs first to make sure they help before using semi-permanent ones. We typically control surface inflammation before placing plugs to avoid trapping inflammatory mediators on the eye surface. Possible risks include excessive tearing, plug loss, irritation, and rarely infection or granuloma formation. Most patients tolerate punctal plugs well and experience significant symptom relief.

For stubborn or advanced dry eye, we offer several in-office treatments at ReFocus Eye Health Bloomfield (NW). These procedures address specific problems that drops alone cannot fix. Thermal pulsation devices apply controlled heat and pressure to clear blocked meibomian glands and restore oil flow to the tear film. Intense pulsed light therapy can reduce lid inflammation and improve meibomian gland function, particularly in patients with ocular rosacea. Candidacy for IPL depends on skin type, with certain skin tones requiring modified protocols. Amniotic membrane application promotes healing of damaged corneal surfaces by providing growth factors and reducing inflammation. Autologous serum eye drops, made from your own blood, provide natural growth factors and nutrients that support healing. Additional options include microblepharoexfoliation to reduce Demodex mites and biofilm along the lids, meibomian gland expression or radiofrequency treatments to improve oil flow, and scleral lenses or PROSE devices to protect the ocular surface and provide continuous hydration. If reduced corneal sensation is present, we may refer for evaluation of neurotrophic keratopathy and discuss treatments such as cenegermin, a recombinant nerve growth factor that promotes corneal healing.

Most diabetes-related dry eye responds to the comprehensive treatments we provide at ReFocus Eye Health Bloomfield (NW). However, complex or severe cases sometimes need specialized care beyond what we can offer. We may refer you to a cornea specialist or dry eye subspecialist if your condition does not improve with standard therapies, if you develop corneal complications requiring advanced surgical intervention, or if you need specialized treatments like scleral lenses or PROSE devices. We also refer if we suspect neurotrophic keratopathy requiring cenegermin therapy, severe ocular surface disease with persistent epithelial defects, or if you need advanced diagnostic testing not available in our office. Your vision and comfort are our top priorities, and we ensure you receive the most appropriate care for your condition.