Red line in vision in stress

[chitransh]

Hello guys, I need an explanation on this:
today i checked my oxygen saturation in Finger Pulse Oximeter (in College)and my readings were
pulse - 67 (it showed normal 60-130)
O2-   98%
when i put stress on my brain(stop breathing and try to push air inside lungs out) my new  readings were
pulse -174
O2-  --   (not shown by meter)
when i started breathing again at that moment ,i saw RED lines either horizontal or vertical in my vision like a CRO display .
one each of horizontal and vertical on left ,one vertical  in middle, one horizontal on right.
Iooked away and they were still there.(total 3 sec)
So i closed my eyes and relaxed and they were gone.
Could somebody explained what happened?Dd my eyes be damaged  with such attempt?

[John C Hagan III, MD, FACS, FAAO]

Good plan.
JCH MD

[chitransh]

Thanks Sir,
I was worried, I won't repeat it