Tested only in the first level!
AMBIENT LIGHT (with lens dirt)
1.Soma ReShade (without depth of field)
2.Soma ReShade + DoF (with depth of field)
1.Download "SOMA ReShade" here: http://www.moddb.com/mods/soma-reshade/addons/soma-reshade1
2.Extract the content where you want (for example, to Desktop).
3.Open the folder that you extracted, and double clik to "Mediator.exe".
4.In the bottom left, click "Add" and select "Soma.exe" in the main folder of the game and "Confirm".
5.On the right, open the dropdown menu arrow (to the left of the "Delete" button) and choose "Soma ReShade + DoF" or "Soma ReShade" if you don't want depth of field.
6.Play the game
IMPORTANT! Turn off in-game Antialiasing!
For FPS boost, select "adaptive v-sync" or turn off.
The depth of field can cause problems reading the subtitles sometimes. Nothing to worry about it, if, unlike me, you know English well.