Is Time Really A Factor?

LOL Ablaze, your jokes...


Two men are sitting at the bar table & one says "hey jackass throw me down a beer." So the bartender throws him down a beer. A few moments later that same person says "hey jackass throw me down another beer." So the bartender throws him down another beer. The other guy sitting at the bar table asks the bartender "hey why does he keep calling you jackass?" ...The bartender replies, "oh Hee-Hawwwwwwwalwayyss calls me that."


^lol, I was visiting w/ my grandpa & he told me that one. Than a few moments later, he told me it again. ...haha he forgets.



Okay, quick question:

As you all know, "lasers" can be pretty hazardous & my DIY night vision device won't be much safer. -Is there any way I could make my device more safe w/out defeating it's capabilities/potential?

Example: Let's just say I want to make this device eye-safe. In order to make my device "eye stafe," I would cover the tip of the laser w/ a lense off a pair of safety glasses.

^This is just for thought, but what exactly happens to the "beam" when it passes through a pair of safety glasses. Does the "power" decrease? Does the wavelength of the laser be decreased down to an "eye safe level?" If so, what exact wavelength? I take it "safety glasses" focus more on wavelength & most likely limit wavelengths. From the safety glasses that I have came across, I did not see much on power rating, it was all about wavelength. -If "power" is so much overlooked than why is it so dangerous to stare at the sun? The peak of the Suns spectrum is around 580 nM which of course is within "visible light."


What is exactly "more dangerous" to human eyes, the power or the wavelength?



The more I think about it, "safety glasses" would have to "stop" the wavelength VS "lowering/decreasing it" otherwise it'd be visible after it passes through the either safety glass lens right?

-Just some thought


Also, as you know most digital camera's LCD screens are no bigger than 3-3.5." Can anyone think of anything else that I could utilize that would have a bigger screen? ...I was looking into security cameras.

Night Vision Eye drops IR Chlorophyll - YouTube

^ This is interesting.

I do not understand how this operates. If you take a look at my device, I need some type of device that would allow IR to be "viewed" because human eyes can NOT view it ("it" meaning IR -not sure on exact wavelengths)

The lenses for safty glasses block a large % of the light at that wavelength. You could get the same effect by just turning down the laser.

I think an ideal setup would have the laser at half power most of the time and would only turn it up to full when you had your finger on the trigger.

Wavelength (nm) determines color. Power (mw) is a measure of brightness or strength. In order for a laser to do permanent damage to the eye it must literally burn the back of the eye. Therefor, in most cases the power of the laser translates directly to how dangerous the laser is.

The only way that the wavelength affects the danger is that IR lasers don't trigger our eye's defenses against bright lights and someone can unintentionally stare into a very bright IR source. The rest of the danger is determined by power.

I don't believe those eye drops for a minute. Just another snake oil salesman.

justinjja said:

Ablaze, I don't think that is correct, if it was, when you look at the sun you would see a single point in the sky,

Click to expand...

That is certainly true, the sun as an observable diameter when looking at it from earth. All other stars are considered point sources.

I depends on the mechanism of damage how relevant that is though. If its something like immediate opticution of the cells the bigger spread area will help, but if its thermal (i.e. bloodflow not adequate to remove heat) it will not matter as much... while the sun doesnt focus to the tinyest spot possible on the retina, the area it hits is very small.