The BlurEffect class, added in version 243, inherits from PostEffect.
Three images, showing a place without blur (left), with the size adjusted at the default 24 (center), and with the size adjusted to the maximum 56 (right).
Description[]
This class allows to create blurriness. When placed in 
Lighting, it will show for everyone. If placed in a CurrentCamera, it will only show for the Local Player.
Properties
Size: float
Determines the intensity of the blur effect.
- Category: State.
- Serialization: can save and load.
- Thread safety: read safe
External links[]
- BlurEffect in the Roblox Creator Documentation
- BlurEffect in the Roblox API Reference