Giant Fresnel Lens Deathray: An Experiment in Optics

Step 3 Eye Protection!!!

This is such a good idea, I decided to make it a whole step. Let me tell you - throughout this project you will spend a lot of time playing with this device, and you'll want to look at the focus a lot to see the results.

However, you will find that after a few seconds, spots linger in your vision when you look away. The center of your retina will become more and more desensitized until it starts taking permanent damage. Then you won't be able to see anything.

When you're looking at this spot, it may not seem so bright. That is because your eyes are already being desensitized. Thus, you have to wear at very least some dark sunglasses. With welding goggles, you can't really see anything except the focal point, so I recommend glacier glasses (used in mountain climbing so you aren't blinded by the sun reflecting off of ice).

Comments

[spamattakky]

I use a regular polarized sunglasses and wear the Real circular polarized 3D glass in front of the other pair, they darken up quite nicely and I always have sunglasses on when you lift the Real to undarken you view. This is the only way for the two polarized glasses will work, put them in any other order or angle and it will not get any darker.

Polarized lens are so cool to work with.