High Myopia
Conditions
Keywords
ocular biometric parameters, Refractive Errors
Brief summary
The study aims to observe the long-term changes of ocular（especially fundus） structure and visual function in patients with high myopia, so as to provide evidence for the prevention, diagnosis and prognosis of high myopia.
Detailed description
High myopia is defined as a refractive error of ≤-6.00D or an axial length greater than 26mm. In recent years, the population of highly myopic individuals has been increasing rapidly. Scholars predict that if no effective interventions are taken, the global incidence rate of myopia is expected to increase from 22.9% in 2000 to 49.8% in 2050, and the visual impairment caused by high myopia will be seven times higher than in 2000 on a global scale. In China, a survey conducted by the National Health Commission in 2018 found that highly myopic students accounted for 21.9% of third-year high school students, indicating that high myopia has become a major public health issue due to its prevalence among younger populations. In recent years, with the development of ocular imaging technologies such as optical coherence tomography (OCT) and corresponding image analysis techniques, high-resolution, non-invasive, fast and in vivo retinal imaging has become more accessible. This has led to the discovery and exploration of various imaging parameters related to optic disc and macula changes in highly myopic patients. We will conduct a 4 years prospective cohort study in the population of 1000 high myopia and controls which have established in mainly college student population, using the latest OCT-A and SS-OCT to observe the long-term changes of fundus structure combined with visual function in patients with high myopia , and explore biomarkers affecting visual function, so as to provide basis for prevention and control of high myopia and prognosis.
Interventions
OTHERobservational
none (observational study)
Sponsors
Renmin Hospital of Wuhan University
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 65 Years
Healthy volunteers
Yes
Inclusion criteria
* Voluntarily sign informed consent; * Commit to follow the research procedures and cooperate with the whole process of the study; * Age ≥18 years old; * Best corrected visual acuity ≥0.1; * Spherical Equivalent Refraction≤-6.00D or axial length ≥26mm in high myopia group；
Exclusion criteria
* Unable or unwilling to sign informed consent; * Unable to cooperate with the examination; * Astigmatism ≤-1.5D； * Patients with refractive interstitial opacity so that fundus images cannot be collected； * Patients with fundus diseases such as diabetic retinopathy, hypertensive retinopathy, age-related macular degeneration, retinal vein obstruction, retinal artery obstruction, etc
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Incidence and progression of myopic maculopathy | Baseline and 6 months and 1，2,3,4years | Collected by color fundus photography and ultra-wide fundus photography |
| Myopic optic nerve changes | Baseline and 6 months and 1，2,3,4years | Changes in the optic nerve head morphology and blood supply which are supposed to be related with high myopia，examined by fundus photography，OCT，OCTA，etc |
| Progression of axial length (AL) | Baseline and 6 months and 1，2,3,4years | Subjects' axial length and its progression collected by IOL master 700 |
| Incidence and progression of visual field (VF) defects | Baseline and 6 months and 1，2,3,4years | Variety and progression of visual field defects collected by Humphrey 860 perimetry |
| Loss of best corrected visual acuity（BCVA） | Baseline and 6 months and 1，2,3,4years | Incidence of BCVA loss collected by subjective optometry |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Structural parameters of anterior segment | Baseline and 6 months and 1，2,3,4years | Structural parameters of anterior segment including corneal curvature，lens thickness(LT)，etc |
| Intraocular pressure(IOP) | Baseline and 6 months and 1，2,3,4years | Incidence of elevated intraocular pressure collected by a non-contact tonometer |
| Mental state and quality of life | Baseline and 6 months and 1，2,3,4years | Mental state and quality of life collected by a questionnaire |
| Relationship between the changes of visual function and pathological changes among patients with high myopia | Baseline and 6 months and 1，2,3,4years | Relationship between the changes of visual function including best corrected visual acuity and visual field and pathological changes among patients with high myopia |
Countries
China
Contacts
Primary ContactQY Wu, MD
Backup ContactRH Hu, bachelor
Outcome results
None listed