Round See Through

You have two options to create this effect

• Round Cone Mask

• See Through Dissolve

Each one with its own advantages and disadvantages. Most of them are highlighted here:

See Through Dissolve	Round Cone Mask (World Dissolve)
Breaks SRP batcher (uses material property blocks)	Modyfies all materials equally
Up to 6 different masks	Up to 4 different masks
Customization options for edge cases (depth offset), when the player is near multiple objects, in a corner, etc...	One fixed shape that dissolves everything within its range
Screen Space shader controlling the effect	World based shape (Round Cone) that control the effect
Stable Screen Space Radius	Not supported

If you're unsure which one to use, you can experiment with the demo scenes that showcase these two techniques and observe how they behave differently.