Here's something you don't see everyday. It's a vision measurement tool for the PC-8001. To establish some form of accuracy, they expect you to use a standard NEC 12" monochrome monitor for the test, and you are supposed to stand 5 meters away from the screen.

When you run the program, a demo launches, displaying a person standing 5m away from a screen and stating which direction the circle opens, and then a screen demonstrating the pressing of the key corresponding to the direction the test-taker observed. The photos were taken randomly so they don't really match up with reality, but this is the flow of the demo.

And this is what happens when you end the demo and go to actually use the program. It takes a good 15 seconds or so to go from screen to screen. Maybe I just don't understand something!

Does it work? Anyone's guess! This program is laboriously slow so I can't imagine it got much use in 1980s optometrist offices. It is, in any event, a curiosity.

The packaging is one of the generic I/O packages.

I found another site talking about it and apparently there is a bug in the code that causes it to error out. It also includes the way to fix it so it displays and calculates the result properly.