Braille Note #1
Commentary: This note is in the same building where you could have saved Cadogan Bates. The Braille note lies on the bed, near the man.
Braille Note #2
Commentary: The second Braille note can be found south-east from The Turquoise Turtle Pub. Examine the corpse of a dead Priwen guardian.
Braille Note #3
Commentary: East from the Hospital, walk along the river to reach a passage that leads to the sewers. Go through them - one of the rooms contain this Braille note.
Braille Note #4
Commentary: This Braille note can be found in the large trading complex. Enter the store that sells fabric - a dead man can be found on the upper floor. Search his corpse to find the last note.
The formula to bring sight back
Commentary: Give all the notes to Mason Swanbrough. He now asks you to get a recipe that can bring back sight. Return to the place where you got Braille note #3. You can now open the door that leads to the laboratory. Inside you will find the journal with the recipe. Go back to Mason and decide - you can give him the journal or keep it for yourself.