Image enhancement
A number 1 optical instruments were telescopes used for magnification of distant images, and microscopes used for magnifying very tiny images. Since a times of Galileo and Van Leeuwenhoek, these instruments have been greatly improved & extended into more portions of the electromagnetic spectrum. A binocular device is a typically compact instrument for two eyes designed for roving have. The camera could be considered a nature and severity of optical instrument for storing an image.

Analysis
An additional class of optical instrument is utilized to analyze a properties of light or optical materials. It include:

Interferometer for measuring a interference properies of light waves Photometer for measuring weak intensity Polarimeter for even measuring dispersion or rotation of polarized light Reflectometer for measuring a reflectivity of a surface or even object Refractometer for measuring refractive index of various materials, invented by Ernst Abbe Spectrometer or monochromator for even even generating or with measurements of the part of the optical spectrum, for the purpose of chemical substance or lesson analysis.