Binoculars were devices used to look at things from a distance.
On Vortis, the First Doctor used binoculars to observe the Zarbi. (PROSE: The Lair of Zarbi Supremo) On Skaro, he used binoculars to survey the Dalek City. (TV: The Daleks) On Bruhl, he used binoculars to observe Grahm being pursued by the police. (PROSE: Justice of the Glacians)
In 1066, the Monk used anachronistic binoculars to scan the sea for longships. (TV: "The Meddling Monk")
In 1941, Captain Jack Harkness used futuristic binoculars to observe Rose Tyler hanging from a barrage balloon. (TV: The Empty Child)
In 2018, Anton used binoculars to observe the Second Doctor frolicking on an Australian beach. (TV: The Enemy of the World)
In 2020, the Eleventh Doctor used binoculars to observe the future Amy Pond and Rory Williams. (TV: The Hungry Earth)