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I was diving this week and was going down and experienced a mask squeeze. I have never had one like that ever and the next day my eyes were bloodshot. How can i make sure this does not happen again. I went to the doctor and he called it somthing i can't pronounce but said don't worry about a thing.
Heh, reminded me of what happened on my next-to-last dive this year. The plastic knob holding the strap to the mask broke and the mask was beyond repair. Luckily there was a spare mask that I could borrow.
So down we went, me with the borrowed mask. At a few metres below surface I was really surprised as for the first time ever in my diving the eyes felt as though they would pop out. What happened was that the strap was a little tight, I put the strap a little higher on my head and the upshot was that the "exit ports" of my longish nose were blocked by mask, so I could not exhale into the mask I actualy couldn't pull the bottom edge off my face, so I needed to flood it from the top, take it off, and loosen the strap.
Thinking about it afterwards, I realised that I must have my nasal passages open at all times so that I never consciously need to equalise the mask pressure.
What is described sounds much like subconjunctival hemorrhaging related to mask squeeze.
Given that there is no significant itching, swelling, discomfort, visual disturbance or incursion into the corneal area, the expectation is that the redness will resolve (the blood will be absorbed) without treatment or residua.
If the condition does involve itching, swelling, discomfort, visual disturbance or alters for the worse in any fashion, medical attention would be prudent.
Be alert to the possibility of mask squeeze and how to prevent it: