View clinical trials related to Myopia.
Filter by:The IOL-capsular complex is formed after cataract surgery and intraocular lens (IOL) implantation. Early postoperative mechanical wrapping of the anterior and posterior capsules plays a significant role in preventing IOL decentration and tilt, as well as formation of the IOL-capsular complex which reduces the incidence of posterior cataract opacity. IOL decentration ≥ 0.4 mm or/and IOL tilt ≥7degree were considered clinically significant cause of poor post-surgery visual quality especially for optical sophisticated IOLs. This negative impact does not affect various types of IOLs equally. Several studies indicated that AL was an independent risk factor of IOL decentration and tilt for emmetropic or moderate myopic eyes. For patients with high myopia, they often have a longer axial length and a larger capsule diameter, which reduces the rotational stability of the IOL and may lead to tilt, decentration and displacement of IOL. Currently, there is no literature guidance to compare the results of cataract surgery combined various types of IOLs implantation in patients with high myopia. The novel anterior segment optical coherence tomography (AS-OCT) device, CASIA2 can evaluate the IOL capsule bending and the lens position after cataract surgery. Also, CASIA2 can be used to documented the dynamic changes of IOL-capsular complex after surgery.
This is a multicenter study to compare the accuracy of IOL calculations in post-laser vision corrected eyes that are about to undergo or have undergone cataract surgery.
Myopia is the most common refractive eye disease worldwide. The number of cases is up to 2 billion. In recent years, the incidence of myopia in China is obviously rising trend. As early as the 2018 national health committee epidemiological data show that teenage myopia rate in China has been the first in the world, and has become the influence in China, especially the youth eye health major public health problem. In recent years, prevention and control measures for myopia have emerged in endlessly, such as increasing outdoor activity time, sufficient sunlight exposure, orthokeratology and local use of low-concentration atropine can partially prevent the occurrence or slow down the progression of myopia. But the effects are limited and cannot completely inhibit the development of myopia. In recent years, with the in-depth study of myopia, it is found that myopia is not only the change of diopter, but also the pathological changes of the whole eyeball shape and corresponding tissues. The incidence of myopia is closely related to the biological parameters of the eyeball, which has become a hotspot of clinical research in recent years. Current studies believe that eyeball biological parameters such as axial length, scleral thickness, choroid thickness are related to the occurrence of myopia, among which the change of scleral structure and shape, namely scleral remodeling, is considered to be an important factor in all visual stimuli leading to myopia. A large number of studies have also shown that scleral remodeling can lead to changes in the scleral biomechanics, thereby promoting the development of myopia. Multiple studies have shown a negative correlation between myopia and scleral thickness, with the thinning of the lower anterior sclera being the most significant. The lower anterior sclera is considered to be a marker for predicting the development of myopia, but some studies have found no correlation between the two. Such differences in the results may be related to the precision of the measurement instrument, the sample size of the included cases, age, and the grouping of different refractive states. The correlation between various biological parameters of the eyeball, especially the sclera, and myopia is not clear at present. Therefore, more penetrating and clearer instruments, more sample sizes, and more scientific grouping are needed for further research and confirmation.
Evaluation of the efficacy in decreasing myopia progression of the proposed ophthalmic lens prototypes.
The purpose of this open controlled multicenter trial is to assess the impact of use of an amniotic membrane on post PKR recovery.
To compare the rate of myopia progression of contact lenses utilising S.T.O.P.® technology against MiSight® contact lenses.
To explore the effectiveness of using repeated low-level red-light therapy to slow myopia progression.
In Taiwan, the prevalence of sleep problems, myopia, and dental caries in school-age children is high. Little is known regarding the implementation of oral and vision health outcomes around bedtime. A bedtime routine intervention was conducted to improve children's oral, vision and sleep health.
Approximately 60 participants at Eye Hospital of Wenzhou Medical University during October,2021 to January 2022 will be enroll in the investigators' study. And dived them randomly into 2 groups:High myopia with axial length between 26 mm and 28 mm and High myopia with axial length more than 28 mm (30 eyes) .
The purpose of this study is to examine the comfort of giving low concentration atropine eye drops.