There's not really anything as "registered deaf" in Canada (nor as far as I know, the United States) since there's no organization or government body to... register with. And while yes, having a hearing loss or being deaf is something they legally cannot discriminate against and must make reasonable accommodations for, making it known drops your chances of getting employed by something like 90%, and even if they do hire you, they won't care enough to do anything for you... especially if it is a severe loss or total deafness. I speak from personal experience.
A few years ago, in my first year of college I applied for a job at a small pet store, part time. Retail, though I wouldn't be interacting with the customers very much, if ever, since I was to be unloading stock in the back and putting it on carts and maybe occasionally stocking shelves.
I got through the brief interview and so on well enough without telling my manager about the hearing loss (some residual hearing, a quiet environment, in-the-canal hearing aids and lip-reading sometimes make me able to pass as a hearing person). On the first day of the job next week, I tell my manager about the hearing loss, out of a mixture of concern for safety (though it wasn't a risky working environment) and simple practicality.
I was promptly "unhired". Company "image" and "difficulty for the customers" and "safety" concerns.
Not much avenue to follow up with it, being naive about working at the time I never got a copy of my employment contract. I never got paid for the day I did work, either.
I finally, through a friend, got another retail job, and while the store owner was understanding, both the night shift managers were not. I would get called over the PA and if one of my co-workers didn't point it out to me, about 20 minutes later the manager would come storming up to me, yelling at me "why didn't you...".
So yeah. Unless you're profoundly deaf, just fudge it. If they're not total assholes, they'll just forget so it won't actually help you, and if they are assholes you will get burned for it. Never give them anything; they will just use it against you.