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.
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.
Study Type
OBSERVATIONAL
Enrollment
1,000
none (observational study)
Renmin Hospital of Wuhan University
Wuhan, Hubei, China
RECRUITINGMyopic optic nerve changes
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
Time frame: Baseline and 6 months and 1,2,3,4years
Progression of axial length (AL)
Subjects' axial length and its progression collected by IOL master 700
Time frame: Baseline and 6 months and 1,2,3,4years
Incidence and progression of visual field (VF) defects
Variety and progression of visual field defects collected by Humphrey 860 perimetry
Time frame: Baseline and 6 months and 1,2,3,4years
Loss of best corrected visual acuity(BCVA)
Incidence of BCVA loss collected by subjective optometry
Time frame: Baseline and 6 months and 1,2,3,4years
Incidence and progression of myopic maculopathy
Collected by color fundus photography and ultra-wide fundus photography
Time frame: Baseline and 6 months and 1,2,3,4years
Relationship between the changes of visual function and pathological changes among patients with high myopia
Relationship between the changes of visual function including best corrected visual acuity and visual field and pathological changes among patients with high myopia
Time frame: Baseline and 6 months and 1,2,3,4years
Structural parameters of anterior segment
Structural parameters of anterior segment including corneal curvature,lens thickness(LT),etc
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Time frame: Baseline and 6 months and 1,2,3,4years
Intraocular pressure(IOP)
Incidence of elevated intraocular pressure collected by a non-contact tonometer
Time frame: Baseline and 6 months and 1,2,3,4years
Mental state and quality of life
Mental state and quality of life collected by a questionnaire
Time frame: Baseline and 6 months and 1,2,3,4years