Staying "unfocused"

Over the past couple of months I have had quite a few experiences while meditating, but all of them last for maybe a few second and the disapate. For instance, yesterdya while meditating I saw the most vibrant blue eyes looking back at me but as soon as I saw them and focused on them they disappeared. I don't know if it's just a thing where everything I see I start bombarding it with thoughts and questions or what but this happens every single time I experience something during a session. I guess my question is, what are some methods used out there to NOT focus on things you see, and instead just let them happen as they will?