The immediate first aid
treatment following the fall of acid into the eyes is thorough wash of the eyes by water. This you have done as you have told in the history.
The next part is to look for the acid particles which may be there in the eyes even after washing the eyes and to look for the severity of injury
the acid has caused.
Hence I advice you to consult your ophthalmologist for examination of the eyes to look for any left out acid particles and remove them and treatment depending on the severity of injury. The treatment usually requires antibiotic eye drops, artificial tear eye drops.