The irritation you have is due to dryness and it can be soothed by the lubricant eyedrop. Very safe to use. The dark patch in front of your eyes is due to the swelling in the retina . Dryness doesn't cause this type of central vision blurring.
Next Steps
It will take a minimum of six months for your problem to resolve, keep a doing regular follow up every month.
Health Tips
Continue to use the lubricant drop