- #1
Envergure
- 6
- 0
Why can't our eyes focus on that one type of deep blue Christmas lights? It always appears fuzzy from a distance, even if another bulb right next to it appears in focus.
Envergure said:Why can't our eyes focus on that one type of deep blue Christmas lights? It always appears fuzzy from a distance, even if another bulb right next to it appears in focus.
I had noticed the same effect with 390 nm lasers. A faint violet, hazy blur appeared around the mirrors where the beam would hit. But as I would have to remove my uv-blocking glasses to notice this, even normal objects did not appear entirely sharp to me.Andy Resnick said:I've noticed the same effect with deep-blue (say 405 nm) laser light. Not sure why, I wonder if it has to do with the fact that only the blue cones get stimulated, and they only make up around 2% of the detectors in our eyes. There's some interesting information here:
http://hyperphysics.phy-astr.gsu.edu/hbase/vision/rodcone.html
Apparently, the blue cones are usually defocused with respect to the red and green cones.
rcgldr said:Blue and violet light are diffracted the most by a lens, so it can end up being more out focus than other colors
DaveC426913 said:What exactly does it mean for a light to be "out of focus" by its own optical components? Focusing phenomena usually occur at the receiving end of the light path.
I'm guessing that the deep blue light is selectively scattered by material in the eye.
The blue color in those Christmas lights is a result of the lights having a high intensity in the blue region of the visible light spectrum. This causes our eyes to perceive the lights as blue.
Blue light scattering occurs when the particles in the lights interact with the light waves, causing the blue wavelengths to be scattered in all directions. This gives the appearance of a blue glow from the lights.
One reason for the popularity of blue Christmas lights is that blue is associated with winter and the holiday season. Additionally, blue lights tend to stand out more against the darkness of night, making them more visually appealing.
The color of the lights does not have a significant effect on their energy consumption. The amount of energy used by the lights depends on the type and number of bulbs used, as well as the length of time they are turned on.
There is no evidence to suggest that the blue light emitted by these lights poses any health concerns. However, it is important to limit exposure to bright lights in general, as they can cause eye strain and discomfort.