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Jacobs DS. Open-angle glaucoma: Epidemiology, clinical presentation, and diagnosis. In: Post T, editor. UpToDate. [Internet]. Waltham, Mass.: UpToDate; 2019 [cited January 21, 2020]. Available from: www.uptodate.com
Replace the purple text with the author of the topic, the red text with the title of the topic, the year with the year in which the topic was most recently updated, and include the date you cited the topic.
When you are in DynaMed, scroll all the way to the bottom of the topic you want to cite. You will see a section called How to cite that includes the topic in NLM citation format -- all you need to do is include the date you cited it.