Active clinical trials for "Myopia"

This study focuses on the genetics and metabolism of Donnai-Barrow Syndrome (DBS).

Emtosecond lasers are used in cutting the flap in LASIK procedures (laser corrective surgery for refractive error). Their use has decreased the incidence of serious complications when compared to the use of microkeratomes(mechanical blades). The commonest femtosecond laser currently used is 'Intralase'. A newer femtosecond laser 'Visumax' (Zeiss) is now available and differs from the Intralase in that it does not interfere with the curvature of the cornea when creating the flap. The Intralase applanates the cornea flat during flap creation which causes the intraocular pressure to be higher. Both Intralase and Visumax lasers are available to patients and surgeons to use at SNEC. The aim of the investigators study is to compare the two lasers in a randomization of left and right eyes in the same patient. The investigators want to measure any difference that the lower intraocular pressure may have during the creation of the flap. This will be measured with a questionaire on patient experience during the procedure and the outcomes of vision, refraction, contrast sensitivity, wave-front analysis, tear function,corneal sensation and flap thickness measured with anterior segment OCT during the post-operative follow up period. To date no-one has compared the use of these two femtosecond lasers. Both lasers are currently used clinically for flap creation at SNEC.

The medical records of 16 eyes of 16 patients with macular hole retinal detachment or myopic traction maculopathy who received viterctomy including internal limiting membrane peeling and scleral shorting surgery were reviewed. Best-corrected visual acuity, axial length, retinal reattachment and macular hole closure, the shape of staphyloma determined by optical coherence tomography and 3-dimensional magnetic resonance imaging were assessed.

The goal of this study is to determine the prevalence of nearsightedness in Canadian school children living in the Waterloo Region.

To identify the underlying causes of macular haemorrhages in patients with high myopia In the eyes found to have macular haemorrhages secondary to choroidal neovascularisation, we hope to identify the risk factors for the development of choroidal neovascularisation in high myopia To study the functional outcome of these eyes as assessed by visual acuity To study the morphological outcome of these eyes by clinical assessment (and fundal photography) and fluorescein angiography

Macular neovascular diseases including age-related macular degeneration (AMD), polypoidal choroidal vasculopathy (PCV), pathological myopia (PM) and etc. can cause severe vision loss. It has become the focus of World Health Organization's blindness- prevention cause. A new anti-VEGF drug conbercept has been approved and showed good efficacy and safety in clinical trials. But the exact therapeutic regimen and the efficacy in the real world still needs to be further studied, the reasons are as follows: The efficacy and safety data of conbercept are collected from rigorous random controlled trials (RCT) , it can not fully reflect the clinical application of conbercept in the real world . Therefore, the knowledge of the therapeutic regimen, safety and efficacy of conbercept is still limited. Conbercept has been approved for wet-AMD only, but in clinical practice, some doctors applied other "off-label use" of conbercept. These "off-label use" has become a common phenomenon all over the world for the instruction book of drugs usually lag behind scientific researches. There is no specific law or regulatory document of drug off-label use in China until now. Anti-VEGF drugs are expensive and often require multiple treatments, and some patients have poor or even no response to the drugs. This resulted enormous waste of medical resources. So, how to accurately find out those patients who have good response, how to develop individualized therapeutic regimen, and the response of patients in the real world need to be urgently investigated in the aspect of pharmacogenomics, and pharmacometabolomics. Therefore, the investigators plan to carry out real-world researches of conbercept on treating macular neovascular diseases has significance and urgency. The investigators intended to conduct a nationwide, non-intrusive, prospective, observational, and multicenter registration study to investigate the efficacy of conbercept in the real-world. And this study will explore the pharmacogenomics and pharmacometabolomics of conbercept, relationships of phenotype and the effectiveness of the drug, optimize the therapeutic regimen, then reduce the financial burden of patients and save the limited medical resources to achieve the purpose of accurate treatment. For three unanswered questions raised in the background, the researchers carried out the following purposes: Investigate the safety and efficacy of conbercept in treating neovascular macular disease in the real world. Find out whether the "off-label use" of conbercept on PCV and PM have good efficacy. Explore the pharmacogenomics and pharmacometabolomics of conbercept through large-sample registration study.

This is a prospective study to validate a predictive algorithm for identifying fast progressing myopes.

the purpose of the study is to compare the accuracy of optical and ultrasonic biometry in intraocular lens (IOL) calculation in high myopic cataractous patients

to analyze the changes in corneal biomechanics of myopic children with different treatment (low concentration atropine eye drops and orthokeratology) and explore the possible mechanism of myopia control

To investigate the Safety and Effect of Overnight Orthokeratology and Its Influencing Factors in China