Fact #071

If you look up at a bright blue sky, you will start to notice tiny bright dots swimming around. These are your white blood cells, which do not absorb blue light very well and so let spots of light through the aforementioned vasculature in front of your retinas. They are usually invisible since you get ‘used’ to the shadows, but these breaks in them are visible as the tiny bright dots you see. It’s called the blue field entopic effect. http://en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s