Posted by Winded on May 03, 2001 at 16:07:42:
In Reply to: Problem Focusing when performing... posted by David Rabinowitz on May 03, 2001 at 12:03:47:
If it's a really high airflow passage, you may be experiencing a bit of hyperventilation. When you go blank, does the light seem to close down from all sides to a spot in the center? One of the first effects of hyperventilation is the loss of most of your peripheral vision.