The Effect of Thyroid Hormon Levels on the Corneal Measures

Study Overview
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Brief Summary
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In this cross-sectional comparative study, it is aimed to investigate the topographic measurements,aberrometrics and densitometrics values of corneas in hypothyroid and hyperthyroid patients compared to healthy individuals. A number of 20 hypothyroid patients (group I), 20 hyperthyroid patients (group II), and 20 age-matched healthy controls (group III) have been recruited. The Pentacam high resolution imaging system is used to determine corneal topographic measurements,aberrometry and densitometry.

Detailed Description
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Thyroid hormone diseases can cause different symptoms and signs in the body according to the hormone levels, particularly in the eyes. Corneal tissue can be affected by many biochemical and hormonal factors, and many ocular surface and systemic diseases can affect the cornea.Hyperthyroidism has been shown to cause symptoms such as conjunctival chemosis, proptosis, increased intraocular pressure, limitation to globe movements due to the restriction of extraocular muscles, increased orbital volume, increased risk of glaucoma with inflammation in the trabecular meshwork and exposure keratopathy, especially in Graves' disease. In the case of hypothyroidism, studies have shown fluid retention and edema in all body tissues, thereby resulting in increased thickness in the cornea, as well as a decrease in corneal hysteresis, which increases the risk of glaucoma. In this study, it is aimed to assess whether thyroid hormone changes affect those parameters by objectively measuring corneal changes via corneal topography, corneal densitometry and corneal aberrometry.

Official Title
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Can Thyroid Levels Affect Topographic, Densitometric and Aberrometric Values of the Cornea

Conditions
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Thyroid Disorder, Corneal Opacity

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Thyroid hormone disorder patients with a novel diagnosis Age-matched healthy individuals without any systemic disorder (e.g., diabetes mellitus, hypertension, rhematoid artritis, asthma etc.) Exclusion Criteria: Having a spherical or cylindrical refractive error of >1.0 degrees, Congenital corneal dystrophies, corneal ectasia, corneal ulcers or scars, keratitis, ocular surface infections, keratoconus, A history of ocular trauma, Uveitis, Glaucoma, A history of contact lens wear, A history of ocular surgery, Dry eye diseases

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Hypothyroidia<br>20 subjects diagnosed with hypothyroidism | |
| Hyperthyroidia<br>20 subjects diagnosed with hyperthyroidism | |
| Healthy<br>20 age-matched healthy control subjects | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| corneal density in throid patients | corneal density values according to type of thyroid disorder | up to 12 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Thyroid disorder, Corneal opacity, Corneal aberrations