View clinical trials related to Amblyopia.
Filter by:The objectives of the Spectacle Phase are: - In previously untreated pure anisometropic patients (i.e. patients who have not used spectacles in the last year and who do not have strabismus), to determine 1. the incidence of resolution of amblyopia with spectacle correction alone and 2. the time course of visual acuity improvement with spectacle correction alone. - In all other patients, to achieve maximal improvement with spectacle correction prior to entering the randomized trial. The objectives of the Randomized Trial are: - To determine whether 5 weeks of patching treatment (2 hours of patching per day of the sound eye combined with at least one concurrent hour of near activities), compared with a control group (using spectacle correction only), improves visual acuity in patients with moderate to severe amblyopia (20/40 to 20/400). - To determine the maximal improvement and time course of improvement with this patching treatment regimen.
The purpose of this study is to compare the results of two standard treatments for amblyopia in order to find out if one is more effective than the other. Amblyopia, which develops in childhood, is also called "lazy eye," because one eye is not being used properly. The brain favors the other eye for some reason, such as crossing or turning out of the eyes, and vision in the weak eye is reduced. Amblyopia is treated by forcing the child to use the weak eye. There are two ways to do this: 1) a patch placed over the "good" eye forces the child to use the weak eye; or 2) an eye drop placed in the "good" eye once a day to blur vision in that eye makes the child rely on the weak eye. The success rates with both of these methods have been reported to be about the same; this study will try to identify if one is more effective than the other. Children will be randomly assigned by computer to one of the following two treatment methods: Patch The child initially will wear a patch over the "good" eye for 8 to 12 hours every day. If vision in the weak eye improves, the patching time will be decreased. If vision remains good after 3 months, the patching will be stopped, unless the child's doctor believes treatment should continue. If vision in the weak eye does not improve, the patching time will be increased. Eye Drops The child will be given one drop per day of atropine in the "good" eye. If vision in the weak eye improves, the drops will be given less often. If the vision remains good after 3 months, the drops will be stopped, unless the child's doctor believes treatment should continue. If the initial daily drop does not improve the vision in the weak eye, the child's eyeglasses may be changed to try to further blur the vision in the "good" eye. After 6 months, treatment may be stopped if it has not been successful. If treatment has been successful after 6 months, it may be continued at a reduced amount or stopped. Follow-up visits will be scheduled every 4 weeks for the first 6 months and every 2 to 4 months after that until the end of the 2-year study. During each visit the eyes will be examined for eye movements and vision, and the pupils will be dilated to examine the inside of the eye.
- To determine whether the success rate with drug treatment (atropine) of amblyopia due to strabismus or anisometropia in patients less than 7 years old is equivalent to the success rate with occlusion (patching) therapy - To develop more precise estimates of the success rates of amblyopia treatment - To identify factors that may be associated with successful treatment of amblyopia - To collect data on the course of treated amblyopia to provide more precise estimates of treatment effects than are now available Extended Follow up of Study Patients - Primary: To determine the long-term visual acuity outcome at age 10 years and at age 15 years in patients diagnosed with amblyopia before age 7 years. - Secondary: To determine whether the long-term visual acuity outcome at age 10 years and at age 15 years differs between patients who received patching followed by best clinical care and patients who received atropine followed by best clinical care