Keratoconus Clinical Trial
Official title:
Corneal Biomechanical Changes and Related Risk Prediction in Allergic Conjunctivitis
NCT number | NCT04299399 |
Other study ID # | 2019045 |
Secondary ID | |
Status | Recruiting |
Phase | |
First received | |
Last updated | |
Start date | November 10, 2019 |
Est. completion date | June 30, 2021 |
By measuring and comparing the corneal biomechanical parameters of normal people, patients with allergic conjunctivitis, keratoconus, whether allergic conjunctivitis causes changes in corneal biomechanics can be explored, and sensitive mechanical indicators of allergic conjunctivitis can be identified. Furthermore, through rubbing frequency, ocular allergic symptom scores and physical sign scores observation, corneal morphological parameters, corneal epithelial thickness, tear inflammatory cytokines levels, and conjunctival microvascular parameters measurements, related factors affecting corneal biomechanics in patients with allergic conjunctivitis can be identified. Otherwise, by comparing corneal biomechanical changes in vernal keratoconjunctivitis before and after drug treatment, biomechanical change tendency during treatment can be clarified.
Status | Recruiting |
Enrollment | 100 |
Est. completion date | June 30, 2021 |
Est. primary completion date | May 31, 2021 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 7 Years to 50 Years |
Eligibility |
Normal group Inclusion Criteria: 1. No abnormalities are found by slit lamp and Pentacam. 2. Diopters: diopter of spherical: -6.0D~+3.0D, diopter of cylinder: -2.0D~+2.0D, spherical equivalent: -6.0D~+3.0D 3. Best corrected visual acuity = 1.0 Exclusion Criteria: 1. Patients diagnosed with other eye diseases other than refractive error. 2. With a history of eye surgery or trauma. 3. With systemic diseases such as immune diseases and connective tissue diseases. 4. With a family history of keratoconus and glaucoma. 5. Wear soft contact lens within 2 weeks or rigid contact lens within 1 month. SAC group Inclusion Criteria: 1. Symptoms: Itching, foreign body sensation, increased discharge in conjunctival sac. And children may mainly show an increase in blinking frequency. 2. Signs: conjunctival hyperemia, swelling, tarsal papillae. 3. Medical history: seasonal onset 4. Diopters: diopter of spherical: -6.0D~+3.0D, diopter of cylinder: -2.0D~+2.0D, spherical equivalent: -6.0D~+3.0D 5. Best corrected visual acuity = 0.8 Exclusion Criteria: 1. Corneal scar. 2. Other active inflammatory diseases of the eye. 3. With a history of eye surgery or trauma. 4. With systemic diseases such as immune diseases and connective tissue diseases. 5. Wear soft contact lens within 2 weeks or rigid contact lens within 1 month. 6. Unable to fixate and cooperate. VKC group Inclusion Criteria: 1. Symptoms: Itching, foreign body sensation, increased discharge in conjunctival sac. And children may mainly show an increase in blinking frequency. 2. Signs: giant papillae on the upper tarsal conjunctiva and gelatinous infiltration of the limbus. 3. Diopters: diopter of spherical: -6.0D~+3.0D, diopter of cylinder: -2.0D~+2.0D, spherical equivalent: -6.0D~+3.0D 4. Best corrected visual acuity = 0.8 Exclusion Criteria: The same as SAC group. Keratoconus group Inclusion Criteria: 1. With a history of myopia and astigmatism 2. Best corrected visual acuity <1.0 3. At least 1 positive sign of the following is found by slit lamp examination: thinning of the corneal stroma, a cone-shaped ectatic protrusion of the cornea, Fleischer ring and Vogt striae. 4. Typical signs of corneal topography: central corneal power value of the anterior surface >47D, central inferior/superior dioptric asymmetry >3D (within 3mm), central dioptric asymmetry between two eyes >1D. Exclusion Criteria: The same as SAC group. |
Country | Name | City | State |
---|---|---|---|
China | Zhongshan Ophthalmic Center, Sun Yat-Sen University | Guangzhou |
Lead Sponsor | Collaborator |
---|---|
Zhongshan Ophthalmic Center, Sun Yat-sen University |
China,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Corneal biomechanics | The corneal biomechanics parameters are measure by Corvis ST, including A1 Time, A1 Velocity, A2 Time, A2 Velocity, HC Time, PD, DA, SP-A1, CBI, TBI and so on. | Baseline in all groups and after 3m medication in VKC group | |
Secondary | Eye rubbing frequency | According to the frequency of eye rubbing, the scores range from 0 to 5 points, 0 point represents no eye rubbing, 1 point means very few eye rubbing, and 5 points represents eye rubbing all the time. | Baseline in SAC and VKC group, and after 3m medication in VKC group | |
Secondary | Ocular allergic symptom scores | Ocular allergic symptoms are evaluated from six aspects: itching, redness, tearing, foreign body sensation, photophobia, and discharges. The scores range from 0 to 3 according to the severity of each symptom. 0 point means no symptoms, 3 points represents serious symptoms. And the total ocular allergic symptom scores range from 0 to 18. | Baseline in SAC and VKC group, and after 3m medication in VKC group | |
Secondary | Ocular sign scores | Ocular sign scores are evaluated from three major aspects: conjunctiva, limbus and cornea. Conjunctival signs include hyperemia, swelling and tarsal papillae. Limbal signs include swelling and Horner-Trantas dots. Corneal sign is evaluated according to corneal epithelial staining. According to the severity of each sign, the sign scores range from 0 to 3 respectively, with 0 point indicating no corresponding signs and 3 points representing serious signs. And the total ocular sign scores range from 0 to 18. | Baseline in SAC and VKC group, and after 3m medication in VKC group | |
Secondary | Morphological parameters of corneal topography | The morphological parameters are measure by Pentacam, including K1, K2, Km of the front and back surface, astigmatism, ISV, IVA, IHD, KI, CKI, IHA, BAD-D and corneal ocular densitometry. | Baseline in all groups and after 3m medication in VKC group | |
Secondary | Corneal epithelial thickness | The corneal epithelial thickness parameters are measured by RTvue OCT, including corneal thickness map and corneal epithelial thickness map within 9 mm, which are divided into four concentric circles with the diameters of 2mm, 5mm, 7mm and 9mm respectively. And the area between adjacent concentric circles are divided into 8 different areas, including superior, superior-temporal, temporal, temporal-inferior, inferior, inferior-nasal, nasal, and superior-nasal area, with a total of 25 areas. | Baseline in all groups and after 3m medication in VKC group | |
Secondary | Conjunctival microvascular parameters | Conjunctival microvascular parameters are measured by functional slit-lamp biomicroscope,including Va, Vs, Q, Mean Diameter, Dbox and D0. | Baseline in all groups and after 3m medication in VKC group | |
Secondary | Tear inflammatory cytokines levels | Kinds of tear inflammatory cytokines levels are measured, including ITAC, GM-CSF, Fractalkine, IFNy, IL-10, MIP-3a, IL-12(p70), IL-13, IL-17A, IL-1b, IL-2, IL-21, IL-4, IL-23, IL-5, IL-6, IL-7, IL-8, MIP-1a, MIP-1b and TFNa. | Baseline in all groups and after 3m medication in VKC group |
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