A noninvasive eye test could help people with Sjögren disease — a disorder that can go undiagnosed for years — get relief sooner, suggested a pilot study published in Therapeutic Advances in Musculoskeletal Disease.
Researchers led by Jing Wu, Department of Ophthalmology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China, and colleagues used infrared imaging to detect atrophy of the oil-producing meibomian glands, which lubricate the eyelids and eyes, in 56 patients with suspected Sjögren disease. The test can be administered by an eye care practitioner using a Keratograph 5M machine. Patients also underwent salivary gland biopsies to detect Sjögren disease.
A total of 34 patients diagnosed with primary Sjögren disease had more significant atrophy and shortening of the meibomian glands in their upper eyelids than 22 patients with other types of dry eye who served as control patients. The accuracy of temporal and total meibomian gland dysfunction dropout rates in the upper eyelids to predict primary Sjögren disease classification was good, with an area under the curve of 0.94 and 0.91, respectively.
“Sjögren’s-related dry eye is definitely inflammatory,” said Esen Akpek, MD, director of the Ocular Surface Disease and Dry Eye Clinic at Johns Hopkins Medicine, Baltimore, who was not involved with the study. “It starts as inflammation, and then the inflammation spreads to the meibomian glands, to the conjunctiva, cornea, and there will be other findings, like corneal ulcers, corneal melts, cyclitis, retinitis, optic neuritis, uveitis, all these inflammatory diseases of the eye could happen with Sjögren’s.”
With other types of dry eye, such as blepharitis or even meibomian gland dysfunction without Sjögren disease, inflammation is usually confined to the ocular surface, Akpek said. As a result, symptoms tend to be less severe and progressive.
The results of this small study need validation in a larger cohort, said Steven Carsons, MD, chief of the Division of Rheumatology at NYU Langone Hospital–Long Island, who was not involved with the study. In general, however, noninvasive alternatives to today’s tests for Sjögren disease could be useful for patients and physicians.
“The definitive diagnosis is a minor salivary glandular biopsy, which is invasive and isn’t really appealing to a lot of patients,” Dr. Carsons said. This test can also be difficult to access if patients don’t live near a medical center that specializes in Sjögren disease, he said.
“I think it’s everybody’s goal to have a noninvasive test be able, at some point, to replace biopsy,” Dr. Carsons said.
Then there are blood tests. “The other more objective test, the SSA antibodies, are not very specific for Sjögren’s syndrome,” he said. “They’re fairly sensitive, but can also be seen in other autoimmune conditions, particularly lupus.”
With existing tools, however, optometrists and ophthalmologists can do more to diagnose Sjögren disease early, Dr. Akpek said.
“The issue with Sjögren’s is not that there are no earlier diagnostic aids or anything like that,” Dr. Akpek said.
Lissamine green, a dye that stains degraded cells on the eye’s surface, can reveal clues in young adult patients before other signs. “In my opinion, the earliest clinical finding that indicates presence of the disease is lissamine green staining of conjunctiva,” Akpek said.
Meibomian gland imaging would detect the disease at a later point. “By the time you get meibomian gland dysfunction, there has been longer-standing inflammation,” she said.
Two challenges hold back diagnoses, she said. One is that many practitioners mistakenly believe Sjögren disease is just a nuisance even though it can threaten vision through ocular complications and have more far-reaching effects, too.
“There are a lot of extraglandular systemic manifestations of Sjögren’s that cause morbidity in these patients,” Dr. Akpek said. For example, Sjögren disease is associated with lymphoma and other malignancies, interstitial nephritis, autoimmune hepatitis, and interstitial lung disease with fibrosis.
The second challenge, she said, is that many ophthalmologists and optometrists assume rheumatologists will make the Sjögren disease diagnosis first and then refer patients to them. But eye doctors are well positioned to spot the first signs — if they look for them.
“When you complain of dry eye, unless the doctor puts certain dyes and takes a look at the surface with the dye staining, they can’t see that you are dry,” Dr. Akpek said.
Unfortunately, these tests are underutilized. “I’m sorry to say, dry eye testing, like clinical testing, is not very commonly done,” she said. “Dry eye is managed according to patient symptoms. A lot of the time, Sjögren’s patients have such severe dry eye that they don’t complain of dryness anymore because their corneas become numb.”
Another way to prevent diagnostic delay is to collaborate, communicate, and carefully review patient records shared by other specialists.
“Particularly because of the wide involvement of different organ systems, such as the eyes, the mouth with dental problems, and then systemic features, including joints, it really does need the cooperation of ophthalmologists, dental specialists, and rheumatologists — immunologists sometimes — to come together and make this diagnosis,” Dr. Carsons said.
The study was supported by grants from the National Natural Science Foundation of China. The authors had no relevant disclosures.
A version of this article appeared on Medscape.com.