Sight or Vision is an attribute of units and structures that allows players on the same team to see enemy units or structures, or to reveal things through the Fog of War. Every unit or building provides vision of a certain distance, and this vision continues to be provided for a brief time after the unit or structure blinks, is warped, or is destroyed. Areas with sight or vision are shown on the minimap as well as the main window. Units which are provided sight are able to attack units that they could not see on their own.
Ground units cannot see up cliffs. A scan will also reveal highground terrain.
Detection is a separate ability. Although detection is tied to a unit's sight range, it will provide detection within that range when its own line of sight is blocked by terrain or sight blockers as long as vision is provided by another unit. The Radar ability of the Sensor Tower works slightly differently from Sight. It shows the player the position of enemy units as symbols, but not the unit type or allow them to be attacked. The Oracle's Revelation provides the Protoss temporary 1-range vision around its targets. The Observer & Overseer have abilities that increase their sight range by 25% at the cost of immobilizing them.
The Tempest and the Siege Tank (in Siege Mode) are notable for having an attack Range longer than their Sight range. For these units to attack at maximum range, some other unit or ability must be used to grant vision of the target. The range of the Liberator in Defender Mode with Advanced Ballistics is also longer than its sight, but it receives vision of its targeted area.
Unless otherwise noted, buildings have a sight range of 9. Buildings under construction have reduced sight range.
Burrowed Zerg units have their sight reduced by 4, except for:
All Zerg Cocoons have a sight range of 5, except the Infested Terran Egg, which has 0.
The Xel'Naga Tower provides a Sight range of 22.
By Sight Range
- Unit vision up ramps has been reduced by 1.
- Adept Shade sight increased from 2 to 4.
- Observer – New ability "Surveillance Mode.": Increases vision by 25% and immobilizes the observer.
- Liberator no longer receives a sight range bonus after transforming into Defender mode but will receive vision of the targeted location.
- Overseer – New ability "Oversight": Increases vision by 25% and immobilizes the Overseer.