Plural

• spectacles

  Optical instrument consisting of a frame that holds a pair of lenses for correcting defective...

• binoculars

  An optical instrument designed for simultaneous use by both eyes.

Also contains

• lens

  A transparent optical device used to converge or diverge transmitted light and to form ima...

• projector

  An optical instrument that projects an enlarged image onto a screen.

• spectroscope

  An optical instrument for spectrographic analysis.

• sights

  An optical instrument for aiding the eye in aiming, as on a firearm or surveying instrum...

• periscope

  An optical instrument that provides a view of an otherwise obstructed field.

• esophagoscope

  An optical instrument for examining the inside of the esophagus.

• jeweler's glass

  An optical instrument used by jewelers; has one or more lenses and is used to view...