Optical Instruments
Process light waves to enhance an image for viewing, or analyze light waves (or photons) to determine characteristic properties.
Binoculars Glasses Telescopes
Binoculars, As Optical Devices

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.

Glasses, As Apparel Eyewear

Also called eyeglasses, spectacles, or specs.Fames bearing lenses worn in front of the eyes, normally for vision correction or eye protection. Safety glasses are a kind of eye protection against flying debris or against visible and near visible light or radiation.


View distant objects through a single optical path.he earliest evidence of working telescopes were the refracting telescopes that appeared in the Netherlands in 1608.The word "telescope" (from the Greek tele "far" and skopein "to look or see".

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