Adapting
Rebuilding depth perception with one eye
You lose the depth that comes from two eyes, but your brain has other ways to judge distance. With a little practice, they get strong.
How one eyed depth works
Two eyes judge close distance by comparing two slightly different views. With one eye, your brain switches to other clues it already knows: the way nearer things move more than far ones when you shift your head, how objects overlap, their relative size, shadows, and perspective. These clues give you reliable distance judgement, especially beyond arm's reach. The hardest distances are very close, within about a metre, which is exactly where practice helps most. Most people adapt well over three to nine months.
Three techniques that work
Move your head
A gentle side to side or up and down shift makes near things move more than far things. This motion is your most powerful depth clue.
Reach and touch
Practice reaching slowly until you touch the object. Each time, you teach your brain to match what you see to the real distance.
Scan your blind side
Turn your head regularly toward your blind side so nothing surprises you. It feels deliberate at first, then becomes a habit.
Everyday tasks, made easier
- Pouring drinks: rest the spout or bottle on the rim of the cup before you pour, so touch tells you the distance.
- Stairs and curbs: use a handrail, and glance down to find the edge. Going down is harder than going up at first.
- Crowds and doorways: keep your blind side near a wall, and let people pass on your seeing side. End seats at a table are comfortable.
- Shaking hands or catching: these get easier with the reach and touch practice above. Give yourself time with fast moving objects.
- Sport: keep playing. Practice judging the ball, wear protective eyewear, and pick a position that suits your field of view.
Keep your one eye safe while you adapt
Adapting is easier when you are not worried about your remaining eye.
