Using binoculars is not a risk free activity. Binoculars are two identical telescopes placed side-by-side that are designed to point accurately in the same direction.
Two views are drawn together to make one total picture and allow the viewer to see things at some distances up close and personal. Will you be hunting, whale watching, or watching birds, or looking for a pair of military binoculars. With a cheap telescope, this will be of no use to you, as it will be hard to keep up.
That is to say, different users with different space between the eyes will be able to view the reticle horizontally. Glass also has a tendency to reflect as much as five percent of the light that arrives at its surface back towards the light source.
Some binoculars are designed with a roof prism to make the best use of natural lighting. The majority of pocket binoculars can be folded up when not in use. If you are still in your twenties you can probably use all of that 7mm exit pupil above as your pupils will dilate to about that size in very dark conditions, however as you get older your pupil does not dilate more than about 4 to 5 mm so large exit pupils are wasted.
Purchasing a pair of binoculars that have been designed with coated lenses will help extend the life of your binoculars. My experience says you will need to spend at least two hundred and fifty dollars for a pair of binoculars worth having.
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