I am short sighted, visually, perhaps metaphorically as well?
One essential qualities, I feel, as a good martial artist is to possess auxiliary vision. The ability to take in peripheral visions. More often than not, we are caught ‘off-sided’ when we fail to see incoming objects from our flanks.
An Aikido stance faces the opponent squarely, up front. sometimes this is not always possible, especially when movement gets fast and fluid. Opponents might not meet you head on, more often than not, they will launch their attack from behind and the sides.
Even if they don’t and chooses to attack you from the front, having peripheral vision enables us to see things and spaces to our sides, that will help us maneuver around our opponent. With our primary vision ‘locked’ on our impending target, we need to have that spare side view to navigate out of a tight corner.
In a tactical situation, it is not often easy to check out a fellow by looking at him/ her directly, so a slanted view help. Peripheral vision also takes into accounts , mirrors, reflections and even puddles of water on the floor. Shadows will also help.