Presence of Dry Eye in Patients with Hashimoto's Thyroiditis

The Association between Autoimmune Thyroid Disease and Ocular Surface Damage: A Retrospective Population-Based Cohort Study

Autoimmune thyroid diseases (ATDs) are potentially connected to lacrimal gland dysfunction and ocular surface disruption. This study aimed to evaluate the relationships between ATD, dry eye disease (DED), and corneal surface damage. In a matched nationwide cohort study, we used Taiwan's National Health Insurance research database to compare the incidences of DED and corneal surface damage between subjects with and without ATD. Multivariable Cox proportional hazards regression models were used to estimate the adjusted hazard ratio (aHR) and 95% confidence interval (CI) for the ophthalmological outcomes. A total of 50,251 matched pairs with 748,961 person-years of follow-up were included for analysis. The incidence of DED was 16.37 and 8.36 per 1000 person-years in the ATD and non-ATD groups, respectively. ATDs were significantly associated with increased DED (aHR: 1.81, 95% CI: 1.73-1.89, p < 0.0001). This association was generally consistent across the subgroups of age, sex, different comorbidity levels, and use of systemic corticosteroids or not. Furthermore, patients with ATD had a higher risk of corneal surface damage compared with non-ATD subjects (aHR: 1.31, 95% CI: 1.19-1.44, p < 0.0001), including recurrent corneal erosions (aHR: 2.00, 95% CI: 1.66-2.41, p < 0.0001) and corneal scars (aHR: 1.26, 95% CI: 1.01-1.59, p = 0.0432). Other independent factors for corneal surface damage were age, sex, diabetes mellitus, Charlson Comorbidity Index scores, and use of systemic corticosteroids. Our results suggested that ATDs were associated with higher risks of DED and corneal surface damage. Considering the high prevalence of ATD, prophylactic and therapeutic strategies should be further developed to prevent irreversible vision loss in this susceptible population.

Symptoms and signs of dry eye in children with Graves' ophthalmopathy

PURPOSE

The purpose of this study is to evaluate the tear secretion and ocular surface properties in children with Graves' ophthalmopathy (GO) and to compare the results with those of healthy children.

METHODS

This was a cross-sectional study. Forty-three patients with GO (Group 1) and 41 healthy children without any ocular and/or systemic disorder (Group 2) were examined clinically and underwent tests for dry eye. We performed analyses including the Ocular Surface Disease Index (OSDI) questionnaire, Schirmer's test under topical anesthesia (<5 mm was abnormal), slit-lamp biomicroscopy (corneal fluorescein staining and tear breakup time (TBUT) under blue-light illumination), and fundoscopic evaluation.

RESULTS

Dry eye symptoms and the mean OSDI score were significantly (P < 0.02) higher (15.6 ± 18.7) in patients with GO compared with controls (5.67 ± 3.6). The mean Schirmer's (basal tear secretion) tests value was significantly reduced in Group 1 (5.25 ± 3.1 mm) compared with Group 2 (17.1 ± 5.2), respectively. The difference was statistically significant (p < 0.005), suggesting inadequate tear production. The mean tear film breakup time in children was lower in patients with GO (8.3 ± 3.42 s,) compared with controls (13.2 ± 4.74 s), (P < 0.001) suggesting an unstable tear film. Decrease of corneal sensitivity (23.3%) was noted in patients with GO compared with controls. GO patients showed a significant increase of the frequency of corneal fluorescein staining (6.9%) in patients with GO compared with controls.

CONCLUSION

Patients with GO had a statistically significant higher incidence of dry eye symptoms and the increase of OSDI score. Significantly lower Schirmer's and TBUT tests results were seen in the study group when compared with the controls. These findings may indicate a tendency for dry eye in pediatric GO patients.

Analysis of diagnostic tests in patients with dry eye and hypothyroidism: an observational study

PURPOSE

Colombia is a country with a high prevalence of hypothyroidism, approximately 18.5% compared to the rest of Latin American countries, which is estimated at 10%. That is why in the ophthalmology consultation we find a large proportion of patients with this disease and who also present symptoms of dry eye. When conducting a search in the medical literature, most publications refer to the clinical presentation of dry eye in hyperthyroidism, which is why the main objective of this study is to evaluate tear function tests in the diagnosis of dry eye in patients with hypothyroidism.

METHODS

This is an observational, cross-sectional study carried out in the period between May and December 2019 in the ocular surface unit of the Ophthalmic Technology Center (CTO) in Bogotá. The tests of: OSDI test (Ocular Surface Disease Index), Schirmer type I, tear meniscus height, NiBUT, Osmolarity, Ferning test, Lisamine Green test of 59 patients with Dry Eye Disease (DED) and history of hypothyroidism.

RESULTS

Schirmer type I and NiBUT tests were the parameters that presented the highest percentage of severity, while lissamine green staining and meniscometry showed a tendency to normality.

CONCLUSIONS

The population of this study presents a mixed type dry eye without epithelial cell damage.

Association between Thyroid Function and Ocular Parameters

During development, thyroid hormones play an important role in eye development, while in adults, some pathological thyroid conditions can affect the normal functioning of the eyes. Thyroid eye disease is the most well-known eye pathology caused by a pathological thyroid condition. Few studies have investigated the association between ocular parameters and thyroid function. Thus, in this study, we aimed to examine whether thyroid activity affects ocular parameters. This cross-sectional study included 4633 healthy adults recruited within the 10,001 Dalmatians project of the Croatian Biobank. The plasma levels of thyroid-stimulating hormone (TSH), free triiodothyronine (fT3), free thyroxine (fT4), thyroglobulin (Tg), thyroglobulin antibodies (TgAb), and thyroid peroxidase antibodies (TPOAb) were measured by an immunoassay. We determined 20 ocular parameters for each participant (10 for each eye, including corneal radius, corneal thickness, anterior chamber depth, anterior chamber angle, lens thickness, posterior chamber length, axial length, intraocular lens power (IOL), spherical power, and cylinder power). Patients with hyperthyroidism had thicker corneas compared to euthyroid individuals. Corneal thickness was also negatively associated with plasma TSH levels. Intra-ocular lens power was higher in patients with clinical hypothyroidism, while spherical power was higher in euthyroid individuals with positive antibodies compared to euthyroid individuals. Intra-ocular lens power negatively correlated with fT4 levels, while spherical power positively correlated with TgAb, TPOAb, and Tg levels and negatively correlated with TSH levels. The anterior chamber angle was positively associated with plasma TSH levels and TPOAb levels and negatively associated with plasma fT4 levels. These findings suggest an interesting interplay between ophthalmic measures and thyroid status, detectable even in the general adult population.

Comparative Clinicopathological Evaluation of the Ocular Surface in Newly Diagnosed Patients of Hyperthyroidism and Hypothyroidism Compared to Healthy Subjects

Introduction Thyroid eye disease is a multifactorial disorder affecting the tear film and ocular surface, which leads to dry eye. The aim of the study is to evaluate the tear function test and ocular surface changes clinically and to correlate pathologically using impression cytology in recently diagnosed cases of thyroid dysfunction, including both hyperthyroid and hypothyroid patients, and to compare the results with healthy subjects. Methods This was a cross-sectional analytical study. Thirty diagnosed patients with hyperthyroidism and hypothyroidism, each within three months, and 30 healthy age-matched controls were included. All patients and controls underwent an assessment of proptosis, palpebral fissure height (PFH), tear function test, Ocular Surface Disease Index (OSDI) questionnaire, Schirmer's test, tear break-up time (TBUT), and impression cytology for ocular surface assessment. These parameters were compared between cases and controls. Standard statistical analysis was used. Results Mean proptosis and PFH showed no significant difference among groups (P-value = .071). The mean value of OSDI was 42.33+22.67, 41.15+16.03, and 29.33+6.84 in the hyperthyroid, hypothyroid, and controls groups, respectively; the difference being statistically significant (p=0.001). Mean TBUT was 7.13+3.28 sec, 6.38+2.46 sec, and 11.15+2.39 sec in hyperthyroidism, hypothyroidism, and controls, respectively (p=0.001). The mean value of the Schirmer tear test was 12.93+5.81 mm, 13.30+4.44 mm, and 17.55+7.35 mm in hyperthyroidism, hypothyroidism, and controls, respectively (p=0.001). Eighty percent (80%) of patients in the hyperthyroidism group had grade 2-3 squamous metaplasia as compared to 70% in hypothyroidism patients and 24.4% in controls, signifying ocular surface damage (p<0.05). Conclusions The mean PFH and proptosis did not differ between the three groups. However, increased OSDI score, decreased Schirmer's test value, decreased TBUT, and grades 2-3 squamous metaplasia in patients with thyroid dysfunction suggest the presence of dry eyes. Despite no clinically visible signs of thyroid ophthalmopathy, there is ocular surface damage right from the early stages of thyroid dysfunction, possibly attributable to the evaporative mechanism as well as ocular surface inflammation and instability of the tear film.

Epidemiology of Ocular Manifestations in Autoimmune Disease

The global prevalence of autoimmune diseases is increasing. As a result, ocular complications, ranging from minor symptoms to sight-threatening scenarios, associated with autoimmune diseases have also risen. These ocular manifestations can result from the disease itself or treatments used to combat the primary autoimmune disease. This review provides detailed insights into the epidemiological factors affecting the increasing prevalence of ocular complications associated with several autoimmune disorders.

Eye symptoms in patients with benign thyroid diseases

Thyroid diseases may cause a variety of functional and structural body changes, including eye and vision abnormalities, which can have a negative impact on a patient’s well-being. However, only a few studies on the impact of other benign thyroid diseases on the visual process are available in the literature. In this study, using the Polish version of the thyroid-specific quality of life (ThyPROpl) questionnaire, we aimed to determine the self-reported influence of benign thyroid diseases (e.g., nodular goiter, toxic nodular goiter, Graves’ disease, thyroid orbitopathy, Hashimoto’s thyroiditis, and surgical hypothyroidism) on patients’ eyes and vision. This was a prospective study. In total, 374 randomly selected euthyroid patients and 255 control subjects responded to the ThyPROpl questionnaire and the results were evaluated. Nearly 69% of the respondents reported that the most frequent condition was “reduced sight.” Men most often reported wet/tearing eyes (66%). The occurrence of eyelid sacks or swollen eyelids (64%), ophthalmalgia (62%), and eye dryness (61%) was marked almost as often. In total, 29% of the patients reported diplopia, and it was found to be most prevalent among those with thyroid orbitopathy. Other complaints were similarly prevalent among all the subgroups. A positive correlation was also observed between the scores of the “eye symptoms” and other ailments. Except for swelling around the lower eyelids, patients with thyroid diseases more frequently experienced all of the ocular complaints analyzed in this study compared with controls. This study showed that eye complaints are common in patients with benign thyroid diseases and ocular disturbances have a negative impact on the overall quality of life of patients.

Ocular Manifestations in Colombian Patients with Systemic Rheumatologic Diseases

Purpose

To establish the prevalence of ocular involvement in a Colombian population with rheumatologic diseases.

Design

Observational cross-sectional study.

Methods

We included a probabilistic sample size of 797 patients who attended a rheumatologic disease center in Bogotá, Colombia. Statistical analysis with descriptive measures and Chi-square independence test between rheumatologic diseases and ophthalmological symptoms and diseases was performed.

Results

Eighty-four percent of the population were women, and the mean age was 54.61± 15.64 years. The most common condition was rheumatoid arthritis (33.37%), followed by fibromyalgia (22.71%), Sjögren Syndrome (19.72%), and systemic lupus erythematosus (9.91%). Almost 7% of the patients presented polyautoimmunity. Thirty-five percent of the patients reported one or more ophthalmological symptoms, being dry eye sensation the most common (30.86%), followed by ocular pain (2.76%), red-eye, and decreased visual acuity (both 2.63%). Similarly, 21.45% of the patients presented one or more ophthalmological diagnoses, being keratoconjunctivitis sicca the most common (15.93%), followed by cataract, uveitis (1.38% each), and scleritis (1.25%).

Conclusion

Almost a third of the patients reported any ocular involvement. It is crucial to be aware of the most common ophthalmic manifestations among the different rheumatologic diseases in our population, to offer early specialist referral and timely treatment.

Ocular Surface Changes in Hashimoto's Thyroiditis Without Thyroid Ophthalmopathy

OBJECTIVE

We sought to evaluate ocular surface changes in patients with Hashimoto's thyroiditis without thyroid ophthalmopathy and elucidate the relationship between dry eye syndrome and meibomian gland dysfunction (MGD) in cases of Hashimoto's thyroiditis.

METHODS

This prospective study included 105 patients with Hashimoto's thyroiditis and 105 age- and sex-matched controls. The 12-item Ocular Surface Disease Index (OSDI) questionnaire was administered to all patients. Both eyes affected by Hashimoto's thyroiditis and normal eyes were evaluated and compared with regard to the following parameters: Hertel exophthalmometry, palpebral fissure height, tear-film breakup time (TBUT), Schirmer 1 test, area and density scores for corneal fluorescein staining, eyelid abnormality, meibomian gland expression, meibography scores, and areas of meibomian gland loss.

RESULTS

The eyes affected by Hashimoto's thyroiditis demonstrated significantly lower TBUTs (P<0.001), Schirmer 1 test scores (P<0.001), and meibomian gland expression (P<0.05) and significantly higher OSDI scores (P<0.001), corneal fluorescein staining results (P<0.05), eyelid abnormality scores (P<0.05), meibography scores (P<0.05), and areas of meibomian gland loss (P<0.05). Ocular Surface Disease Index scores were significantly positively correlated with eyelid abnormality scores (P=0.025), meibography scores (P<0.05), and areas of meibomian gland loss (P<0.05) and negatively correlated with meibomian gland expression (P<0.05). The duration of Hashimoto's thyroiditis was significantly positively correlated with MGD (P<0.05).

CONCLUSION

Dry eye syndrome and ocular discomfort symptoms are significantly more common among patients with Hashimoto's thyroiditis, even in the absence of thyroid ophthalmopathy. Dry eye syndrome in patients with Hashimoto's thyroiditis is believed to result from MGD and is correlated with the duration of the thyroid disease.

Local Ocular Surface Alterations in Children with Hashimoto's Thyroiditis

PURPOSE

To evaluate the ocular surface characteristics based on Schirmer's test, tear break-up time (TBUT), and conjunctival impression cytology (CIC) in children with Hashimoto's thyroiditis (HT).

METHODS

This study included 51 children with HT and 53 control subjects. The ocular surface characteristics of participants were assessed via Schirmer's test, TBUT, and CIC. Conjunctival samples were examined cytologically according to the Nelson grading system.

RESULTS

Schirmer's and TBUT results were significantly lower in HT group (p < .05). All samples in both the study and control groups were evaluated as grade 0 according to the Nelson classification (p = .841), however, goblet cell density (GCD) was significantly lower in HT group (p = .001). Schirmer test results were significantly associated with the duration of HT (p = .025, r = -0.311).

CONCLUSION

Hashimoto's thyroiditis without any ocular complaints may cause ocular surface changes with TBUT and Schirmer's. Although CIC analysis showed similar grading results, GCD was significantly decreased in HT group.

Feline dry eye syndrome of presumed neurogenic origin: a case report

Case summary

A 14-year-old female spayed Abyssinian cat, which about 1 year previously underwent thoracic limb amputation, radiotherapy and chemotherapy for an incompletely excised vaccine-related fibrosarcoma, was presented for evaluation of corneal opacity in the left eye (OS). The ocular surface of both eyes (OU) had a lackluster appearance and there was a stromal corneal ulcer OS. Results of corneal aesthesiometry, Schirmer tear test-1 (STT-1) and tear film breakup time revealed corneal hypoesthesia, and quantitative and qualitative tear film deficiency OU. Noxious olfactory stimulation caused increased lacrimation relative to standard STT-1 values suggesting an intact nasolacrimal reflex. Various lacrimostimulants were administered in succession; namely, 1% pilocarpine administered topically (15 days) or orally (19 days), and topically applied 0.03% tacrolimus (47 days). Pilocarpine, especially when given orally, was associated with notable increases in STT-1 values, but corneal ulceration remained/recurred regardless of administration route, and oral pilocarpine resulted in gastrointestinal upset. Tacrolimus was not effective. After 93 days, the cat became weak and lame and a low thyroxine concentration was detected in serum. The cat was euthanized and a necropsy performed. Both lacrimal glands were histologically normal, but chronic neutrophilic keratitis and reduced conjunctival goblet cell density were noted OU.

Relevance and novel information

The final diagnosis was dry eye syndrome (DES) of presumed neurogenic origin, associated with corneal hypoesthesia. This report reinforces the importance of conducting tearfilm testing in cats with ocular surface disease, as clinical signs of DES were different from those described in dogs.