View clinical trials related to Myopia.
Filter by:A new multi-purpose solution (MPS)was clinically evaluated against Opti-Free RepleniSH MPS at specific time points over the course of four days. The study was conducted with PureVision lenses.
The aim of this trial is to assess Complete Easy Rub compared to a competitor multi-purpose solution in terms of lens cleanliness, subjective response and ocular response, when lenses are worn bilaterally on a daily wear basis for two months. The hypotheses for this trial are: - Lens cleanliness measures between solutions will be no different. - Subjective ratings between solutions will be no different. - Ocular response between solutions will be no different.
The purpose of this study is to assess the performance of an investigational contact lens among contact lens wearers.
Myopia is the main reason of vision loss in the world which is seen in 30.4 million adults in USA (1). In a myopic eye, images are focused in front of retina because, cornea and crystalline lens become more powerful in focusing the image or the eye axis become too long (axial myopia) (2). Myopia prevalence in adolescents has been raised in recent years and nowadays it has reached to 10-25% and 60-80% in western and eastern countries respectively (3). Tehran eye study showed that the prevalence of myopia in Tehran is 21.8% and 17.2% based on manifest and cycloplegic refraction respectively (4). One study in Dezful, Iran showed that 3.7% of 7-15 years old children are myopic (5). Today potential role of early life nutrition in myopia development in later life is becoming an attractive field of study. It has been shown that until weaning; breast milk is the main source of many nutrients [such as docosahexaenoic acid (DHA)] which are important for photoreceptors and cortical neuronal development (6). But results about the relationship between breastfeeding and likelihood of childhood myopia are controversial. A hypothesis-generating study (7) showed an independent and inverse relationship between breastfeeding and likelihood of myopia in 10-12 year old Singaporean children. However, data pulled from three English birth cohorts done in 10-11y and 15-16y children did not show any effect (8). To examine the association between breastfeeding pattern and likelihood of myopia in 6-7y children, a retrospective case-control study is designed in National Nutrition and Food Technology research Institute of Iran. This study will try to assess breastfeeding pattern and almost all cofactors which may relate to myopia.
The purpose of this study is to investigate the front surface wettability of soft contact lenses while on eye.
The purpose of this study is to compare the performance of commercially marketed contact lenses to habitual contact lenses in a selected segment of the contact lens wearing population.
In this study 126 eyes in 63 patients with moderate bilateral myopia and astigmatism between -3 and -5 (SE difference between two eyes should not be more than 0.75 and the residual corneal thickness>350 μ ) were entered in the study. One eye went randomly under PRK with mitomycin C 0.02% in 15 min and then the other eye went under the operation without MMC. UCVA,BCVA, refractory error after the operation and the number of endothelial cells before and after the surgery would be compared in 6 months.
The purpose of this study is to evaluate the performance of two daily disposable contact lenses in a population of neophytes (new wearers).
The aims of this study are to investigate the effects of ortho-k for astigmatic and myopic reduction and myopic control in children, and the long term effects on corneal curvatures and biomechanics.
The primary objective of the current study is to investigate changes in peripheral refraction and aberration in children wearing orthokeratology lenses and single-vision spectacles.