Sight

Sight is a property of units, structures, and certain summoner spells, items, and abilities in League of Legends that represents a team possessing vision of a target area. Inversely, the area of the map in which a team does not have sight over is known as the Fog of War, a common hallmark of the RTS genre which is represented visually as a dark shroud over the terrain.

Possessing sight is necessary to observe most information about any non-allied units in the game. Such information can include, among many other things, the unit's current location, direction, health, mana, possessed buffs and purchased items, making the acquisition and denial of sight one of the most crucially important skills to learn in high levels of play.

All units in the game will grant vision up to a specific radius:

• 1350:  champions, pets, super minions, and  turrets
• 1200: melee, caster, and siege minions
• 900:  Totem Wards,  Stealth Wards,  Control Wards,  Zombie Wards, and  Effigies
• 500:  Farsight Wards
• 450:  Ghost Poros
•  Disabled wards do not grant vision.
• Items and abilities do not always grant sight and those that do often have differing applications of the mechanic to one another.

There are two obstacles that exist towards regular sight - impassable terrain (which is always opaque to vision granted by units, structures and most items and abilities) and  Brush (which is opaque towards vision when viewed from the outside inwards and not the reverse). Such barriers will also block vision of any areas that are directly behind them from the sight-granting unit. Units that can directly observe an area around these obstacles are commonly described as having line of sight towards that area.

Sight can be removed in three ways - the withdrawal of any sight-granting units, abilities or items from the vicinity, the expiration of a sight-granting debuff or spell, or directly with the  nearsight debuff (which currently only exists with Graves' Smoke Screen, Nocturne's Paranoia, and Quinn's Blinding Assault). Be noted, however, that despite looking like such, Rek'Sai's Burrow does not necessarily nearsight her, as she conserves allied vision.

True sight is a unique form of sight linked to the detection of  stealthed units. A unit that is stealthed is not affected by standard sight and is only visible with a source of true sight nearby. All sources of true sight currently in the game also provide standard sight - otherwise, true sight follows the same rules as standard sight. True sight does not infiltrate  nearsightedness.

 Obscured vision is a form of detection that does not innately reveal units nor make them targetable in any sort of way. Instead, the unit's position is distinguished through their movement patterns and silhouette. This mechanic currently only exists in Rek'Sai's Burrow, Fiddlesticks' A Harmless Scarecrow, Oracle Lens, and Oracle's Extract.

 Unobstructed vision is a type of sight that permeates through terrain. It allows the unit to be able to see beyond their sight radius if otherwise obstructed ( Brush). However, it can still be shrouded by  nearsight. Kayn's Shadow Step and Aurelion Sol's Comet of Legend are the only two abilities that benefit from this mechanic.

The objects listed below are abilities and items that can temporarily grant sight of an area or enemy, as well as which of those abilities and items grant true sight.

Standard Sight

Area-reveal

Champion Abilities

Items

Jungle Plants

• Scryer's Bloom

Unit-reveal

Champion Abilities

Items

• Twin Shadows

Summoner Spells

• Ignite

Other

• Dragon Slayer (true damage DoT)

True Sight

Area-reveal

Items

Unit-reveal

Champion Abilities

Summoner Spells

• Mark