Omnioculars is a collectable object.
|“||Replay action...slow everything down...and they flash up a play by play breakdown if you need it.||”|
On the second zoom they are in the third section over on the left side of the bottom row.
There is currently no use for this item on Pottermore.
From the Story
Discovered in Book 4, Chapter 7, Bagman and Crouch
"Omnioculars are similar to Muggle binoculars, but can also be used to replay action, or to slow motion down. They flash up a play-by-play breakdown of Quidditch matches if the user needs it. They are ten galleons each. Harry buys himself, Hermione and Ron a pair of omnioculars each at the Quidditch World Cup."
Discovered in Book4, Chapter 8, The Quidditch World Cup
"Harry uses his Omnioculars during the Quidditch World Cup match between Ireland and Bulgaria. He is able to spin a dial on the side of the Omnioculars to slow down the Quidditch players long enough to read the word 'Firebolt' on their brooms, and to see their names embroidered on the back of their shirts. Pressing the 'play-by-play' button on the top of the Omnioculars allows him to watch the match in slow motion, whilst glittering purple lettering flashes across the lenses. The Omnioculars tell the exact Quidditch moves used by the players, such as the Hawkshead Attacking Formation and the Porskoff Ploy. When watching the Quidditch match through the Omnioculars, it is easy to get lost; Harry is confused when he hears that Ireland have scored when, through slow motion on his Omnioculars, he is busy watching a Bulgarian player flying with the Quaffle."