View clinical trials related to Strabismus.
Filter by:The purpose of this study is to identify genes associated with impaired development and function of the cranial nerves and brainstem, which may result in misalignment of the eyes (strabismus) and related conditions.
Every year over 1,000 children undergo eye muscle surgery provided by physicians at this institution. For many of these children this is not and will not be the only surgical procedure for eye muscle correction. All of these children will experience differing degrees of postoperative pain. The pain associated with strabismus surgery is due to the manipulation in the conjunctival area and further handling of Tenon's capsule, sclera and the stretching of the eye muscle . Research has demonstrated that repeated painful procedures result in increased anxiety and increased pain. Previous studies have demonstrated that children experiencing preoperative anxiety are more likely to have increased postoperative pain . This increased preoperative anxiety may also contribute to sleep difficulties and increased analgesic consumption. Depending on the age of the child, different methods are used to reduce anxiety such as distraction, child life services, or anti-anxiolytic agents. In addition to pain, children undergoing strabismus surgery frequently experience postoperative nausea and vomiting (PONV).This increased incidence of nausea and vomiting is thought to be related to the use of opiates for pain control. Short acting opiates are used preferentially at this hospital in the belief that this reduces recovery issues of sedation and PONV. Preliminary data, however, suggests no difference in recovery outcomes for fentanyl versus hydromorphone. The purpose of this study is to investigate the optimal analgesia to create a standardized approach for pain management in pediatric patients undergoing surgery for strabismus.
The hypothesis is that pediatric patients with increased levels of anxiety on the day of surgery, in particular at point of anesthetic induction, will demonstrate decreased compliance with assessment in ophthalmology clinic postoperatively.
This project will assess whether there is a significant difference in compliance with patching in amblyopic patients whose parents are instructed to pinch the superior and inferior edges of the patch before applying (in order to improve comfort) versus patients whose parents are instructed to place the patch evenly around the orbit.
The occurrence of emergence agitation (EA) in pediatric patients who have received sevoflurane anesthesia is a common postoperative problem. Among various strategies for reducing the incidence and severity of EA, the use of pharmacological agents at the end of anesthesia is thought to be the most convenient and easily applicable method in clinical situation. The one of typical agents that can be administered in this way is propofol. Previous studies demonstrated that the use of propofol 1mg/kg at the end of anesthesia could reduce the incidence of EA with low incidence of postoperative nausea and vomiting. However, it was also demonstrated that the use of propofol 1mg/kg at the end of anesthesia could delay the emergence time. The purpose of this study is to compare the preventive effect on EA and the emergence time between propofol 1mg/kg and propofol 0.5mg/kg administered at the end of sevoflurane anesthesia.
Amblyopia is a developmental condition that is characterized by reduced vision of the eye due to the presence of a sensory impediment during visual development, such as strabismus (ocular misalignment) or anisometropia (unequal refractive error), occurring early in life. Recent studies in humans and animals point towards a cortical locus for the processing deficit in amblyopia, revealing sensory deficits at the signal cell level. If changes in retinal neuronal function are also present, is unknown. Like in the brain, blood flow in the retina is coupled to neuronal activity. This phenomenon has been measured by different study groups with non invasive techniques in the brain and retina. It has been shown in previous studies that stimulating the retina with diffuse luminant flickering light increases retinal vessel diameter and blood flow. However, it is unknown whether this is also the case in the retina of amblyopic eyes. Additionally, the introduction of blood oxygen level dependent (BOLD) fMRI also makes it possible to directly access the vascular response in the brain to visual stimuli. Therefore, the aim of the present study is to investigate the effect of luminant flickering light on retinal vessel diameter and retinal blood flow in subjects with amblyopia. Also, oxygen saturation in retinal vessels will be assessed as well as pattern ERG for assessment of retinal function. Additionally, a high resolution image of the visual pathway will be taken with 7 Tesla MRI to investigate whether anatomical or functional alterations are present.
This study seeks to determine if bupivacaine injection of eye muscles can make them stronger and stiffer, and thereby correct the position of eyes that are turned in or mis-aligned, a condition generally termed strabismus. It seeks further to find out the different effects of various concentrations or formulations of bupivacaine, and whether addition of Botox to other eye muscles can add to the effect of bupivacaine and enhance the correction of strabismus.
Vision therapy (VTO) is a group of non-surgical treatment helping patients in 3 subjects;1)increasing the the visual acuity 2)improving the mechanical skills resulting in increasing the power of extraocular muscles,biocular vision,peripheral vision 3) increasing the perceptual skills making the brain to percept the colour and visual memory better.In this study we are going to compare the effect of vision therapy /orthoptic on motor & sensory of the 3 to 7 years old strabismic patients