Inflammation of the Clear Surface of the Eye Without Ulcers in Dogs (Nonulcerative Keratitis)
- Occurrence: common
- Location of disease: Head/Neck
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
Non-ulcerative keratitis, also known as corneal inflammation, is an inflammatory condition of the cornea of the eye in dogs that occurs without ulcers or open Wounds.
The most important facts at a glance
Non-ulcerative keratitis is an inflammatory eye disease in dogs in which the corneal layers are affected without damage to the epithelium. The inflammation can be triggered by immune responses, physical irritation, or genetic factors. A common cause is “dry eye,” in which the tear glands do not produce enough tear fluid. Certain dog breeds such as the German Shepherd, Dachshund, and Cocker Spaniel are particularly susceptible. Symptoms include watery or mucous eye discharge, reddened eyes, corneal cloudiness, and sensitivity to light. Diagnosis is made through a thorough eye examination, including Schirmer tear tests and fluorescein staining. The disease is treated with anti-inflammatory eye drops, tear replacement therapies, and in severe cases, systemic medications. The prognosis is often good with timely treatment, but chronic cases can lead to permanent Visual disturbances. Preventive measures include regular eye examinations, good eye hygiene, and avoiding irritants. Researchers are investigating genetic and immunological factors as well as new therapy approaches to better understand and treat the disease. The role of environmental factors such as UV radiation is also being studied to develop better prevention strategies.
Causes
The cornea is the clear, outer layer of the eye that focuses light and allows the dog to see clearly. It consists of several layers: the epithelium, Bowman’s membrane, the stroma, Descemet’s membrane, and the endothelium. The health of these layers is crucial for maintaining the clarity and functionality of the eye.
Non-ulcerative keratitis is characterized by inflammation of the corneal layers, while the epithelium remains intact. The inflammation can be triggered by various factors, including immune responses, physical irritation, and genetic predispositions.
One of the most common causes of non-ulcerative keratitis is keratitis sicca, also known as “dry eye,” a condition in which the tear glands do not produce enough tear fluid to adequately lubricate the eye. This leads to chronic irritation and inflammation of the cornea.
Genetic predisposition also plays a significant role, as certain dog breeds, such as the German Shepherd, Dachshund, and Cocker Spaniel, are more commonly affected. In these breeds, the disease can be triggered by hereditary factors or an abnormal immune response.
Symptoms
Some of the most common symptoms of non-ulcerative keratitis include redness and cloudiness of the cornea, which often appears as a milky or bluish haze. This can impair the dog’s vision.
Another notable symptom is frequent blinking or closing of the affected eye, as the inflammation is often associated with Pain or discomfort. The dog may also frequently rub its eye with its paw, which increases the risk of an additional infection or further injury.
In some cases, increased tearing or mucus discharge may also occur as the eye tries to fight the inflammation. The conjunctiva, the tissue that covers the eye and the inside of the eyelids, may also be reddened or swollen.
Therapy
Treatment of non-ulcerative keratitis aims to reduce inflammation and maintain corneal health. In many cases, anti-inflammatory eye drops or ointments are prescribed to relieve Swelling and Pain.
In dogs with keratitis sicca, tear replacement therapy or the use of medications that stimulate tear production is often considered. Cyclosporine A or tacrolimus are commonly used medications in these cases.
In more severe cases, or when an immunological cause is suspected, systemic medications such as corticosteroids may be used to control the inflammation. However, these should be used with caution, as they can have side effects.
Regular monitoring of the eye is crucial to assess treatment success and make adjustments as needed. In some cases, surgery may be required, especially for structural anomalies of the eyelids or tear glands.
Prognosis and follow-up care
The prognosis for dogs with non-ulcerative keratitis varies depending on the cause and severity of the condition. With early diagnosis and appropriate treatment, the prognosis is generally good, and many dogs can achieve a normal quality of life.
However, chronic cases or those that do not respond to treatment may lead to permanent Visual disturbances. It is important to follow the veterinarian’s treatment plan closely and have regular follow-up examinations to monitor the condition.
Dogs that are genetically predisposed may require lifelong management and regular care to prevent the disease from progressing and to preserve eye function.
Prevention
Prevention of non-ulcerative keratitis requires regular eye examinations, especially in dog breeds that are prone to it. Early detection and treatment of eye diseases can help reduce the risk of keratitis.
Good eye hygiene, including regular cleaning of the eyes and avoiding irritants, can also help minimize the risk of Inflammatory conditions. In dogs with known allergies or eye diseases, regular use of eye drops or ointments may be recommended for prevention.
It’s important for dog owners to watch for signs of eye problems, such as excessive blinking, redness, tearing, or cloudiness, and to seek veterinary advice promptly if needed.
Outlook on current research
Non-ulcerative keratitis, also known as chronic superficial keratitis or pannus, is an inflammatory eye disease that occurs mainly in certain dog breeds, such as the German Shepherd. Recently, research has made significant progress in identifying genetic and immunological factors that contribute to this condition. One of the key findings is the role of the body’s own immune response, which is influenced by environmental factors and genetic predispositions. Researchers are increasingly investigating specific genetic markers that predispose dogs to this disease, which could influence future breeding programs.
Another exciting area of research is the development of new therapy approaches aimed at modulating the immune system. While conventional treatments such as topical corticosteroids and immunosuppressants are widely used, efforts are underway to develop more targeted therapies with fewer side effects. These include novel drugs that block specific inflammatory pathways, as well as trials of gene therapies aimed at correcting faulty genetic information.
In addition, ongoing studies are looking at the role of environmental factors such as UV radiation in the development and progression of non-ulcerative keratitis. It is suspected that UV light could amplify the immune response in susceptible dogs, which could lead to worsening symptoms. Researchers are therefore investigating the effectiveness of UV protection measures, such as special dog goggles or applying UV-blocking substances to the eyes as a prevention strategy.
Another line of research focuses on improving diagnosis of the disease. Advances in imaging technology, such as confocal microscopy, allow veterinarians to create detailed images of the cornea to better assess the severity of the inflammation and monitor the course of treatment more accurately. These technologies could also help shorten diagnosis times and improve treatment outcomes.
In summary, research into non-ulcerative keratitis in dogs is a dynamic field that seeks to better understand the genetic, immunological, and environmental factors behind this complex condition. These findings could not only lead to better treatment strategies, but also contribute to prevention and possibly even the eradication of the disease in susceptible populations.
Frequently Asked Questions (FAQs)
1. What is non-ulcerative keratitis in dogs?
2. What symptoms does a dog with non-ulcerative keratitis show?
3. Which breeds are most commonly affected?
4. How is the disease diagnosed?
5. What treatment options are available?
6. Can non-ulcerative keratitis be cured?
7. Are there any preventive measures?
8. How does the disease affect the dog’s life?
9. Are regular vet visits necessary?
10. Is there hope for new treatment methods?
Literature
- Bedford, P. G. C., Longstaffe, J. A., & Grierson, I. (1979). Corneal pannus (chronic superficial keratitis) in the German shepherd dog. Journal of Small Animal Practice, 20(1), 41–56. https://doi.org/10.1111/j.1748-5827.1979.tb07019.x
- Williams, D. L. (1999). Histological and immunohistochemical evaluation of canine chronic superficial keratitis. Research in Veterinary Science, 67(2), 191–195. https://doi.org/10.1053/rvsc.1999.0329
- Drahovská, Z., Balicki, I., Trbolová, A., Mihalová, M., & Holičková, M. (2014). A retrospective study of the occurrence of chronic superficial keratitis in 308 German Shepherd dogs: 1999–2010. Polish Journal of Veterinary Sciences, 17(3), 543–546. https://doi.org/10.2478/pjvs-2014-0082
- Karamatic, S., Bartl, J., Kovač, K., Samardžija, M., Capak, H., Galov, A., & Curik, I. (2022). Genome-wide association analysis for chronic superficial keratitis in dogs. Genes, 13(8), Article 1328. https://doi.org/10.3390/genes13081328
- Maini, S., Everson, R., Dawson, C., Chang, Y. M., Hartley, C., & Sanchez, R. F. (2019). Pigmentary keratitis in pugs in the United Kingdom: Prevalence and associated features. BMC Veterinary Research, 15, Article 384. https://doi.org/10.1186/s12917-019-2127-y
- Sarmiento Quintana, D., Suárez, M. L., González, M. A., & Esteban, J. (2024). Ocular surface characteristics in pugs with pigmentary keratitis. Animals, 14(4), Article 580. https://doi.org/10.3390/ani14040580
- Kim, H., Jeong, Y., Lee, E., Seo, K., & Kang, S. (2023). Treatment of immune-mediated keratitis (IMMK) in dogs with immunosuppressants observed with spectral domain optical coherence tomography (SD-OCT). Journal of Veterinary Science, 24(5), Article e66. https://doi.org/10.4142/jvs.23059