Presentation software can incorporate a rich mix of multimedia content including pictures, animations, audio and video. It is incorrect to assume that blind and partially sighted people are not interested in the information conveyed by such media.
Say what you see
At its simplest, you could make a point of briefly describing images and multimedia elements such as video clips as they come up in your presentation. The important thing is to ensure that any key points are verbalised so they are not missed by blind or partially sighted members of your audience.
Similarly, animated elements which don't actually convey information can be very briefly described in order to ensure blind and partially sighted members of your audience are not excluded. Humour is a good example here where sighted members of your audience may be laughing at a purely visual animation.
Where animations are used to convey important information a verbal description could also be given. For example, "A Bee is buzzing around various investment options but finally settles on our Daffodil fund"
Audio description
More extensive use of video in a presentation may require more than a basic description of the action. It is important for blind and partially sighted people to be able to follow what is going on. Often, the audio content alone of a video is insufficient to convey this information.
In these circumstances you could consider having an audio description option added to your video especially if it is being used to convey important information to a wide audience. For this to be effective it is well worth seeking professional advice on audio description.
Alternative formats
If you have converted your presentation to another format as detailed in Providing accessible formats you will also be able to add text descriptions to any graphics or multimedia used in order to aid accessibility.
Further information on accessibility for presentation software can be found on the Slide design and layout, Projected presentations, Transitions and effects, Producing handouts and Providing accessible formats pages.