High Myopia

In this cross-sectionnal study the aim is to increase the understanding of posterior staphyloma through a unique European consortium. Therefore, all eligible patients that either visit the outpatient clinic at Radboud in Nimegen, the Netherlands, or visit University Hopital Puerta de HierroMajadahonda in Madrid, Spain, or visit University Hospital Cochin in Paris, France, and after consenting, will be included. 600 high myopic European cases are expecting. A standardized protocol in all centers in order to create a uniform dataset. Besides the standard of care, blood samples will be collected. All data collected will be stored in an onlie Castor database

This study aims to establish a multi-center artificial intelligence model for the accurate calculation of intraocular lens and its clinical application in highly myopic cataract, so as to improve the accuracy of the prediction of postoperative diopter in highly myopic cataract patients.

The purpose of this study is to evaluate the long-term visual outcome of the cataract surgery using a large-scale and comprehensive database of high myopic cataract and age-related cataract patients. The investigators will further investigate into the various genetic and environmental factors that may contribute to the pathogenesis of high myopic cataract.

According to estimates by the World Health Organization, approximately half of the global adult population currently suffers from varying degrees of myopia. In urban areas of China, the myopia rate among primary school students has reached about 40%, and can exceed 80% in high school students. The proportion of patients with high myopia (refractive error greater than 600 degrees) is also increasing year by year. This group is more prone to severe visual problems, including an increased risk of complications such as cataracts, glaucoma, and macular degeneration. Pathological myopia is the main risk factor for vision loss caused by high myopia. In such patients, the elongation of the ocular axis leads to local thinning and protrusion of the posterior pole of the eyeball, forming a posterior scleral staphyloma. Posterior scleral staphyloma is the most representative pathological feature of pathological myopia. Local dilation of the choroid leads to thinning and stretching of the retina, which may ultimately cause problems such as macular retinal schisis, seriously affecting vision and even leading to blindness. This project aims to develop a multimodal intelligent screening system by combining the excellent imaging technology and advanced artificial intelligence (AI) of the Optos non-mydriatic ultra-wide-angle laser scanning ophthalmoscope, B-scan ultrasonography ophthalmic diagnostic instrument, and optical coherence tomography (OCT). The system is designed to achieve precise identification and assessment of ocular fundus diseases, especially pathological myopia, and particularly the core condition of posterior scleral staphyloma (PSS). Simultaneously, a vision prediction model will be constructed to assist doctors in formulating personalized diagnosis and treatment strategies, predicting the trend of vision deterioration, and enhancing the effectiveness of early intervention. This system is expected to significantly improve the prevention and control of pathological myopia, reduce the risk of blindness, and play a pivotal role in telemedicine services, benefiting people in remote areas and promoting public health equity and service quality.

The goal of this clinical trial is to evaluate whether an enhanced monofocal intraocular lens targeted for monovision can improve visual outcomes in patients with cataract and high myopia (axial length ≥ 26 mm). The main questions it aims to answer are: For people with cataract and high myopia, does an enhanced monofocal intraocular lens targeted for monovision provide greater binocular uncorrected distance visual acuity compared with targeting myopia in both eyes? Does an enhanced monofocal intraocular lens targeted for monovision provide comparable binocular uncorrected intermediate and near visual acuity, contrast sensitivity, reading ability, spectacle independence, stereopsis, and photic phenomena compared with targeting myopia in both eyes? Researchers will compare an enhanced monofocal intraocular lens targeted for monovision with one targeted for myopia in both eyes to determine whether the monovision strategy is more effective. Participants will: Undergo phacoemulsification with enhanced monofocal intraocular lens implantation. Attend follow-up visits at 1, 3, 6, and 12 months after cataract surgery.

Children aged 7-14 years with high myopia were randomly assigned to a control group or an intervention group at a 1:1 ratio. The intervention group wore H.A.L.T. MAX lenses for at least 10 hours per day for 2 years, and the control group wore ordinary single-vision (SV) spectacles for at least 10 hours per day. At the 1-year follow-up examination (6-month visit), control subjects whose equivalent spherical diopter change (SER) was ≥0.75 D were switched to H.A.L.T. MAX lenses until the end of year 2. After entering year 2, all remaining control (SV) subjects will be replaced with H.A.L.T. MAX defofocus frames for at least 10 hours per day until the end of year 2. And continue to wear it for at least 10 hours per day. To evaluate the efficacy, safety and compliance of H.A.L.T. MAX lenses in delaying myopia progression in children with high myopia, and to provide a scientific basis for the formulation and practice of public health programs for delaying myopia progression and the risk of blindness and visual impairment caused by high myopia.

Implantable collamer lens (ICL) implantation is considered one of the most effective surgical treatments for high myopia. The procedure primarily involves adjusting the position of the ICL within the eye. However, precise calculation of the ICL optical power may cause the surgical light source to remain focused on the macular area during this process, potentially leading to iatrogenic light-induced damage. Theoretically, the combination of a 3D visualization surgical system and coaxial illumination technology can reduce the illumination intensity and decrease iatrogenic light damage. This study aims to compare the retinal physiological changes in patients undergoing ICL surgery through 3D visualization surgical system with coaxial illumination versus a traditional microscope with standard illumination.

Prospective, longitudinal, interventional, exploratory, non-randomized, single-center study including patients with pathological myopia .

Study Purpose: This prospective, self-controlled clinical study aims to evaluate the impact of capsular tension rings (CTR) on intraocular lens (IOL) stability in high myopia patients undergoing bilateral cataract surgery. Each patient will receive CTR implantation in one eye, with the fellow eye serving as control. Postoperative outcomes, including visual acuity, refraction, IOL positioning, and visual quality, will be compared between eyes to assess the effectiveness of CTR. Study Methods: Eligible participants (axial length ≥ 26.0 mm) will undergo femtosecond-assisted phacoemulsification with identical IOLs implanted in both eyes. One eye will be randomly assigned to receive a CTR. All surgeries will be performed by the same surgeon. Follow-up will be conducted at 1 day, 1 week, 1 month, 3 months, and 6 months postoperatively. Assessments will include UCVA, BCVA, refractive error, anterior segment OCT, IOL decentration and tilt, and visual quality (iTrace). Sample Size and Population: A total of 60 patients (120 eyes) will be enrolled. Inclusion criteria include age ≥ 18 years and bilateral cataracts with high myopia. Exclusion criteria include other ocular diseases, history of severe ocular trauma, or poor visual potential. Patients will be stratified by axial length into three groups: ≤28 mm, 28-30 mm, and \>30 mm. Study Procedure: After informed consent and baseline examinations (including ocular biometry and imaging), patients will undergo surgery and be followed at specified intervals. All data will be managed securely. Comparative analysis between CTR and non-CTR eyes will be performed to evaluate the effect of CTR on IOL stability and visual outcomes in highly myopic cataract patients.

The purpose of this study was to compare Scheimpflug corneal tomography findings in keratoconus and high myopic astigmatic eyes, as well as to establish the parameters distinguishing keratoconus from high myopic astigmatism.

Small Incision Lenticule Extraction (SMILE) was introduced in 2011 using the VISUMAX femtosecond laser (Carl Zeiss Meditec, Jena, Germany). It is designed for correction of myopia and myopic astigmatism. It involves the creation of a corneal tissue disk called lenticule and its extraction through a minimally invasive incision, utilizing only a femtosecond laser. This enables rapid visual recovery with very little discomfort to the patient. This observational case series monitors visual and refractive outcomes of myopic correction for more than -7.75 D. It is to * gather long-term results and refractive stability * detect rare complications or side-effects * evaluate the efficacy in a large number of patients

Study aiming to evaluate Macular Vascular Density in High Myopes without pathological myopic maculopathy in outpatient clinic in Sohag teaching hospital using OCTA .

The purpose of this study is to evaluate the visual outcome of the cataract surgery, including best uncorrected and corrected visual acuity, spherical equivalent, wavefront aberration and other measurements.

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.