Catch a retinal net

You can use a dim point of light to cast a shadow of the blood supply of your retina onto the retina itself. This will allow you to see the blood supply of your retina, and even your blind spot.

A [...]

A Mini-MagLite
3/8 inch dowel, cut to the length of a AA battery
Aluminum foil

Wrap the dowel in aluminum foil.
Unscrew the back of the Mini-MagLite and remove one AA battery, replace the battery with the aluminum-foil wrapped dowel.
Unscrew and remove the front of the Mini-MagLite.
The light will come on as [...]