Answer:
-Check for airway passage blockage if none
-Size the scene right up.
-Shout-tap-shout. The response and respiration check should be at least 5 seconds but not more than 10 seconds.
-If no injuries are found during head-to-toe checks while waiting for EMS to arrive, put the person in a recovery position on his side.
I actually have that problem. I have 20/40 vision and my left eye is pretty much blind. I was prescribed glasses so that my sight in my left eye would not get worse. All to say, I would consider glasses to be necessary in this case. It definitely helps in every day life.
I hope this helps and have a great day!! :)