View clinical trials related to Visual Impairment.
Filter by:In this study, the study team utilize virtual reality (VR) to simulate visual impairments of different types and severity in healthy subjects. The platform implements three of the most widespread forms of visual impairment in the United States (US): age-related macular degeneration (AMD), diabetic retinopathy (DR), and glaucoma, each with three levels of severity, (mild, moderate, and severe). At present, glaucoma is further developed toward a multidimensional visual impairment simulation. The platform is utilized: i) to provide a safe, controllable, and repeatable set of environments for development and preliminary testing of electronic travel aids (ETAs) in a variety of conditions (i.e., using the ETA to navigate in the immersed environment); and ii) to equip blind and low vision (BVI) professionals, inclusive of orientation and mobility (O&M) instructors, with a controlled, tunable training platform for skill/capacity building, assessment, and refinement of O&M techniques, as well as visually impaired trainees with a safe and immersive environment to improve their O&M skills and learn novel techniques. Two sets of hypothesis-driven experiments are proposed to assess the feasibility of the platform with respect to these two objectives.
Cerebral Palsy (CP) is the most common childhood disorder that occurs with a lesion in the developing infant brain, seen in 2-3/1000 live births. CP is a posture, movement and tone disorder that occurs due to prenatal or postnatal causes. It is not progressive, but since the anatomy of the lesion and the physical development of the individual are not completed, the course of the disorder may vary throughout life. Accompanied by motor dysfunctions, it varies according to clinical types. In addition to this, various visual, sensory and behavioral problems, speech disorders that cause learning difficulties and cognitive problems can also be observed. Ophthalmic disorders are the most common problem in CP and can also affect the developmental process of the patient. Since ophthalmic disorders and neurological deficits are associated in CP, the relationship between neurological disorder and ophthalmic disorders has been investigated in the literature. The aim of this study is to establish the Turkish validity and reliability of the Visual Function Classification System (VFCS) specific to individuals with Cerebral Palsy (CP).
The purpose of the current study was to compare the visual performance after bilateral implantation of the Panoptix IOL , or the AT LISA IOL or Tecnis Symfony IOL . The focus was on intermediate vision, defocus curves, and contrast sensitivity.
This study is aimed at examining the BCVA from try-on glasses constructed from measurements from the EyeQue VisionCheck.
Prompted by the current COVID-19 pandemic, the American Academy of Ophthalmology has recommended the use of telemedicine to continue ophthalmic care while maintaining patient and provider social distancing. As part of remote examinations, patients may be expected to perform home eye testing for visual acuity and the use of various home visual acuity charts have been proposed to provide clinicians with this vital data. However, the use of home visual acuity exams has not been validated in our patient population. This project aims to determine the efficacy and validity of measuring visual acuity at home with a printed-out ETDRS chart.
Youth and some adults have photoscreening refractions and hand-held auto refraction before cycloplegia refraction during new and follow up eye examinations. Vector math is applied to each refraction to determine how closely the hand-held "dry" devices match actual refraction.
An individual senses the world and reflects feedbacks via independent behaviors. Such precise collaboration of the sensory and behavioral systems is fundamental to survival and evolution. When a sensory modality is altered, the behavioral system has the potential to fit in a substitute modality. However, the specific dynamics of human behaviors in response to sensory loss remain largely unknown due to the paucities of representative situations and large-scale samples. Here, the investigators focused on thousands of human infants who suffered varying degrees of visual stimuli deficiency in early stages, while their behavioral systems remained sensitive and thus retained high behavioral plasticity. Having access to this unique population provides an unprecedented opportunity to investigate the effect of diverse visual conditions on the behavioral system and develop a domestic apparatus for screening visual impariment of infants.
During recent years, the interest in studying the risks of being born moderate-to-late preterm (MLP), defined as birth between gestational week 32 to 36, has increased. Today the investigators know that morbidity and mortality are significantly higher in these individuals compared to individuals born full-term. However, few studies have focused on the development of the eye in MLP individuals. The purpose of the study is to evaluate eye morphology and visual function in relation to growth, metabolism, blood pressure, neuropsychiatric factors, and quality of life in adolescents born MLP. The results of the examinations will be compared to an age-matched control group. The study will evaluate the structural, functional, and metabolic aspects of the eye with the hypothesis that early eye abnormalities may detect the risk of developing metabolic and cardiovascular diseases.
Background: One of the most difficult refractory glaucomas in treatment is the neovascular type and its association with dense cataract add to this difficulty. This study aimed to provide results of triple surgical treatment of such conditions. Methods: A total of 12 eyes of 12 patients with dense cataractus NVG patients were included in this study. The patients mean age was 57.25 ± 5.9 years. The mean pre-operative intraocular pressure (IOP) was 47.25 ± 4.04 mmHg with maximum antiglaucoma therapy. The mean best corrected distant visual acuities (BCDVA) in log MAR was 2.13 ± 0.38. All the patients received intra-vitreal injection of 1.25 mg (0.05 ml) bevacizumab followed by phacoemulsification, pars plana vitrectomy (PPV) including pan-retinal photocoagulation (PRP), and assisted trabeculectomy with Mitomycin c (MMC). Mean IOP and BCDVA changes were the main outcome results of this study.
This study will provide a profile of blindness/visual impairment, avoidable blindness and cataract surgery service in Chaonan, mainland China. We also evaluate the diagnostic accuracy of Rapid Assessment of Avoidable Blindness (RAAB) comparison with conventional survey.