The University of Washington gathered suggestions from several popular presenters. about how to make presentations more accessible. 

Here are a few that are easy to follow:

• Minimize the number of slides. No one wants to be shot with a fire hose while trying to understand your talk.
• Minimize the amount of text on slides. When you advance a slide, pause to let people read it before saying anything. This will allow people who are deaf and everyone else in the audience to read the slide before you start talking.
• Avoid presenting images of complex charts or tables. Make graphics as simple as possible. No one wants to read a complicated graphic when there are only a few important facts about it.
• Make sure that videos are captioned and audio described. Sometimes it is good to give a brief description of what is in the video before it is played. This will help audience members to establish a context for what comes next.
• Ensure the question and answer period is accessible. If there is a microphone for questioners, make sure they use it. Otherwise, repeat the question so everyone can hear it/it gets interpreted.
• Face people with hearing impairments, and avoid covering your mouth, so they can see your lips. Avoid talking while chewing gum or eating.
• Speak clearly at a normal volume. Speak louder only if requested.
• When using an interpreter, speak directly to the person who is deaf; when an interpreter voices what a person who is deaf signs, look at the person who is deaf, not the interpreter.

This 10-minute video from AHEAD will also give you all sorts of tips and advice on how to make your presentations engaging and accessible to all of your audience.