Colorblindness, partial

This pilot study tests whether a non-invasive headset that delivers mild electrical stimulation to nerves behind the ear can safely improve sleep in adults who are blind or severely sight impaired. Sixty participants will use the device for 30 minutes a day, five times a week for…

This early-stage study at Johns Hopkins is testing whether cannabidiol (CBD) can reduce stress and nicotine withdrawal symptoms in people who smoke. Ninety healthy smokers will receive CBD and then be exposed to stress while researchers measure their mood, heart rate, and stress …

This study looks at how older adults with and without vision problems step over obstacles of different heights and colors. Researchers want to understand how vision and eye movements affect walking to help prevent falls. About 200 adults who can walk on their own will take part.