Binoculars, field glasses or binocular telescopes are a pair of identical or mirror-symmetrical telescopes mounted side-by-side and aligned to point accurately in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most are sized to be held using both hands, although sizes vary widely from opera glasses to large pedestal mounted military models.
Unlike a (monocular) telescope, binoculars give users a three-dimensional image: for nearer objects the two views, presented to each of the viewer's eyes from slightly different viewpoints, produce a merged view with an impression of depth.
Almost from the invention of the telescope in the 17th century the advantages of mounting two of them side by side for binocular vision seems to have been explored. Most early binoculars used Galilean optics; that is, they used a convex objective and a concave eyepiece lens. The Galilean design has the advantage of presenting an erect image but has a narrow field of view and is not capable of very high magnification. This type of construction is still used in very cheap models and in opera glasses or theater glasses. The Galilean design is also used in low magnification binocular surgical and jewelers' loupes because they can be very short and produce an upright image without extra or unusual erecting optics, reducing expense and overall weight. They also have large exit pupils making centering less critical and the narrow field of view works well in those applications. These are typically mounted on an eyeglass frame or custom-fit onto eyeglasses.
I'm a peeping Tom, I shamelessly
Watch the windows next to me
When it's dark outside
There's nowhere they can safely hide
I can see you when you're getting ready to go out
and other stuff you're embarrassed about
and when you sing off key I can't hear you
but I see that your mouth is moving
Can you see me
I only watch you when I'm bored
Your place - all the gadgets I can't afford
Don't know your name
but I like the PJs that you wear
Please don't be freaked out by me
You're my miniature TV
Comb your hair and brush your teeth
So obliviously
Can you see me
When your lights are off
I wonder where you go
'cause I want to serenade you
from my window
I can sit and be amused
by your scandalous dance moves
and if you're sick I'll dance it alone
I will come and dance with you
Can you see me
Am I creepy?
I'll come dance with you (can you see me?)
I'll come dance with you (can you see me?)
I'll come dance with you
I'll come dance with you