Search Engine Optimization (SEO) and website accessibility are not the same thing. There are different rules to follow, different audiences to target, and different ways to test the effectiveness of each. Optimizing your website for search engine bots does not mean it will be automagically accessible to real people too. Some SEO practices may even hurt your website’s accessibility. However it is not all bad news, there are some areas where the two worlds overlap. If you have a limited budget and/or timeframe for a project, targeting these overlapping areas may simultaneously boost both SEO and website accessibility.
Link to the actual event.