What is the best technique for viewing dim objects at night?

Using off-center viewing is the best technique for observing dim objects at night because it takes advantage of the eye's physiology. The human retina contains two types of photoreceptor cells: rods and cones. Rods are more sensitive to low light levels and are primarily located in the peripheral regions of the retina. By avoiding direct vision and instead gazing slightly away from the dim object, more light can hit the rod cells, enhancing visibility.

This technique is especially effective in low-light conditions, where the ability to see fine details is diminished. Directly staring at a dim object can often result in less detail being perceived because it relies more on the cone cells, which are less sensitive in low-light environments.

Using a flashlight can significantly alter the light conditions, which may overpower the dim light from the object you want to see, washing it out or causing glare. Closing one eye does not necessarily enhance night vision; it could even hinder depth perception and does not leverage the available light in the same manner as off-center viewing. Hence, utilizing off-center viewing is the most effective strategy for enhancing night vision and better observing dim objects.