In Roblox, the usual value for vision blur depends on the effect you mean, but for a standard blur effect people often start with a size around 7 to 10 for a noticeable blur, and lower it for a subtle look.

What it usually means

Roblox creators commonly use a BlurEffect in Lighting or a DepthOfFieldEffect to simulate blurry vision, and one forum example uses a blur size that is adjusted based on distance while another tutorial shows blur being enabled with a camera-view change.

Practical range

  • Subtle blur: around 2 to 5.
  • Clear but noticeable blur: around 7 to 10.
  • Heavy blur: above 10, depending on the scene and effect strength.
    These values are commonly tuned by testing because the right amount changes with screen size, lighting, and how dramatic you want the effect to feel.

For a game effect

If you want a quick visual cue like low health, stun, or UI opening, start at 7 and adjust from there. If you want a more cinematic focus effect, DepthOfFieldEffect is usually the better choice than just pushing blur very high.

Example

A simple setup might use:

  • BlurEffect.Size = 7 for a mild blur.
  • BlurEffect.Size = 12 for a stronger vision blur.
  • Then reduce it back to 0 when the effect ends.
    That matches the general way Roblox tutorials and dev forum examples handle blur intensity.

TL;DR: there is no single fixed value, but 7–10 is a solid starting range for Roblox vision blur, with 7 being a common default test value.