This area has no light receptors because the nerve is in the way

you can find your blind spot with this test.

Look at the red cross on the left with your right eye

closing your left eye, move your head slowly closer and further away

"So weird" at a certain distance the blue dot on the right will disappear

pause if you need to, you've just found your blind spot

After images, stare at the white dot in the center of the image and try not to blink.

your eyes have three types of cones or color receptors

red, green and blue.

After images disappear when you stare at a particular color for too long

and those color receptors get tired.

so when you suddenly switch to looking at a black and white image

those tired receptors aren't working as well

This leaves an afterimage of the reverse colors.

See your veins!

Blood vessels and veins feed the photosensitive cells in your eye to keep them alive

These blood vessels cast shadows on your retina

Here's how you can see those veins.

Poke a small hole in a post it note or piece of paper

hold that against a bright white background like your computer screen

look to the hole while shaking the post-it slightly

you should see a shadowy network online sort of like the veins a leaf

these are the veins in your eye. Gross...

dominant eyes

Most people have a dominant eyes, meaning that one eye gives more priority information than the other

Eighty percent of people are right eye dominant

See which is your dominant eye.

Make a triangle between your thumbs and forefingers

With both eyes open, look at an object several feet away

Center the object inside the triangle, close one eye and then the other.

Your dominant eye will look like this

and your non-dominant eye will look like this.

It's almost visionary.. see what "I" did there