My vision is kinda weird, I don't have a very high prescription at all, doc said I barely need glasses and I would likely never use them. But boy do I need them. One of my eyes overcompensates for the other, so I used to tire real quickly. If I put my glasses on I need to "manually" focus my eye (focus with one, then focus with the other) to make my good eye give up some of the workI've had many vision tests over the years and always got the same "you don't really need glasses". Didn't get them until about 5 years ago. As a kid they thought the droopy eye was a lazy eye. Maybe it is afterall.. it is my "bad" eye.![]()
I went for my driver's test 5 years ago and realized I had no depth perception whatsoever.. how different things could've been had I gotten glasses sooner. I was the joke in PE since I couldn't catch a ball and have terrible aim, always picked last for teamsWell... duh!![]()
It's sort of freaky, when I focus my eyes after putting my glasses on everything seems to shift into place. It feels as if I wake up and everything comes to live. I describe as 2D movies vs 3D movies. My world becomes 3D.
Insufficient convergence. You probably have prisms in your glasses to compensate. The difference between you and me is my brain doesn't look at the same place in both retinas for an image so it can't fuse. Thus no 3D. You can!

One string about 6 feet long
3 different color beads, about 3/4" diameter, with holes through the center
Put the beads on the string and connect one end to the wall slightly lower than eye height
Spread the beads so the string is ~ 4 equal lengths
Pull the other end of the string so it is tight and hold it to your nose
- Look at the first bead. If you are seeing "normally" you will see 2 strings going to the first bead then the string will split and you will see two strings going to two points on the wall with the two other beads on each string.
- Shift to the second bead. You should see two strings each with the first color bead, then the strings converge at the second bead, then split again to the "two" 3rd beads and the wall. It will look like an X
- Shift to the 3rd bead and you should see two strings each with the first two beads, then converging at the 3rd bead and then splitting to two strings attached on the wall.
- Move back and forth among the beads
Another exercise you can do with this is to put the first bead at arms length. Focus on it. Then reach out and pull the bead a little closer and focus on it. Repeat until the bead is at your nose.
This video is quite good, I found others that were not:
At the end she describes what to do if you see only one string - blink. Which reminded me that Michelle my vision therapy tech would often say "blink, blink, blink".
There are a lot of other vision therapy tools, some pretty basic and some technology driven, such as computers with 3D glasses and programs where you move the images seen by each eye.
For everyone - try the Brock string just for fun. If you or any family member doesn't see two strings crossing in an X at each bead then splitting - find a vision therapist! The younger you catch this the easier it is to train your brain to ALWAYS use both eyes (once corrected for near or far sightedness if necessary).
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