How to See in the Dark

Be friends with the dark..
Be friends with the dark..


Human beings cannot see in total darkness. In general, they do not have very good night vision. However, it is possible to improve your ability to see in the dark.

Steps   

  1. Peripheral vision is more night sensitive..
    Peripheral vision is more night sensitive..
    Take advantage of the structure of your eyes. The human eye has 'rod' cells and 'cone' cells on the retina, which is the sensory layer at the back of the eye. Rod cells and cone cells are distributed evenly throughout the retina except for the fovea, which is a small area on the back of the eye directly opposite the pupil. At the fovea, there are only cone cells. This is an important thing to know because the 'cone' cells are more proficient at color detection, whereas 'rod' cells are better for low light and detecting movement. Therefore, when trying to see in low light, try not to look directly at the places you are trying to see. By using your peripheral vision you are using more rod cells, which work much better in low light. This takes a great deal of practice for most people.
  2. Keep your eyes adjusted for the dark. If you're in a lighted area and know you're going to be going into a dark area, close your eyes tightly, or at least squint your eyelids before entering the dark to give your eyes a chance to adjust. If you can't close both eyes, close one or place a hand over one. This works well when driving into tunnels. Once you're in, avoid looking directly at any light source, no matter how dim you think it is. It takes longer to adjust back for the dark than it did for your eyes to adjust for the light you just looked at.
  3. Practice. This can be as simple as shutting out the lights in a room and closing all portals, allowing only the ambient light that slips in under the door.
  4. Scan, don't stare. If you look at something, or a place, in the dark for too long, your eyes will become less sensitive to what little light there is. If you scan your eyes back and forth over the area you are looking at, you will be using different areas of "rods" as described above, and you will be able to see details clearer.
  5. Protect your night vision. If you do need to use a light, having a coloured lens over the light will help preserve your night vision. White light, containing all frequencies, from red all the way to blue, will ruin your night vision the fastest. Red is favored when you need to recover quickly, green or blue-green should be used for acuity. Whatever light that is used, it's important to use as low intensity as possible.


Tips   

  • In the martial art Ninjutsu, students are told in order to see better in the dark, get lower than what you are trying to see. This really works.
  • Practice seeing things without looking directly at them.
  • Prepare yourself for the darkness before entering it.
  • Be aware that nicotine diminishes your ability to see in the dark. Avoid cigarettes, even second-hand smoke, when you need to see in the dark.
  • Avoid looking directly at light sources while navigating in the dark. Even if you aren't looking at them directly, light sources close to your face will diminish night vision. For example, if you are smoking you might realize that the red/orange glow in front of you provides enough light to cause your pupils to contract, therefore killing your vision. Similarly, you will not see much if you're wearing a miner's helmet with a light or carrying a flashlight (excluding the beam of light itself, of course).
  • Special Forces use the technique of squeezing their eyes shut tightly for ten seconds - once they are in the dark. While the technique can seem effective, scientific studies have not proven it works. Perhaps its a case where the brain and belief override normal physical reactions.
  • In WW2 Soviet Specops used this technique: eating a piece of sugar some time before going out in the dark and lighting their open eyes with a red flashlight for approximately 10 seconds.
  • Different people have different levels of ability in night vision. While these techniques can help you reach your full potential, your full potential may not be as great as that of others.
  • Look for shapes, not colors. In tall grass, look for horizontal lines that stand out against the vertical grass. These will indicate an obstacle/target.
  • When moving around in the dark, it is safer to move slowly and slide your feet, using your toes to sense obstacles in front of you. You're most stable when you have both feet on the ground, and are less likely to trip and sprain, or even worse, break something. Also, if you put your arms out to feel where you're going, cross them at your wrists and form a circle with your elbows out to the sides, thus helping you to keep your balance while avoiding walking into a post, tree trunk or edge of an open door.
  • If you are on a road with traffic, when traffic appears, quickly close one of your eyes. This will preserve the sensitivity in that eye to the low light conditions. When the car is gone, you can reopen it, and still be able to see well in the dark. This also works well when you need to briefly use a flashlight.
  • An illuminated watch dial can be a handy source of very-low-power light.
  • Driving at night presents special challenges especially in very dark places like mountain roads. Headlights from oncoming cars can really degrade you night vision. Obviously you don't want to look directly at the headlights but if you close your eyes you risk a terrible crash. If you look at the white line at the outer edge of the road you can maintain a safe course without having to stare into some one's high beams.
  • Quick and dirty technique: shut one eye during a temporarily bright period to preserve its night vision. If your bathroom is so dark that you need to turn on the lights to use it at night, for instance, and don't want to walk into a wall on your way back to bed after you turn the lights off, just shut one eye before you turn on the lights and don't open it until they are off again; this will give you adequate night vision to negotiate, even with one eye still blinded.
  • The fashionable eye patch worn by the pirates weren't always due to the loss of an eye. In fact many pirates did it so that the one eye was good at seeing in the dark.
  • In a stargazing program, there is an option to make the screen red, this is because red does not affect your rod cells so you can look at red light forever and then look in the dark and can see well.


Warnings   

  • Traipsing around in your home or outside the house can be very dangerous. You should weigh the facts of being "cool" walking around in pitch black against hurting yourself badly.
  • There's an urban legend about carrots helping one to see in the dark. It it true. The vitamins in it help you see better. This is actually traceable back to a misinformation campaign by the British air ministry during World War II. While there are theoretically some benefits from extremely high doses of beta-carotene in preventing ocular degeneration, and those suffering from nyctalopia, a Vitamin A deficiency, can find some relief in the consumption of carrots, this does not apply to the average person. Interestingly, extremely high doses of beta-carotene can turn your skin orange (this doesn't seem harmful, and eventually goes away without changing your diet). Overconsumption of carrots can also cause your veins to shed the plaque which has built up over the years. These plaque chunks can become lodged in a variety of places possibly resulting in blindness or stroke. Neither of which would help your quest for night vision.
  • Be careful when practicing moving about in the dark. If you fall and hurt yourself, don't panic! Take a few deep breaths and re-orient yourself before checking the extent of your injury and finding a light source.