https://github.com/hyiltiz/profileblindspot

An interactive game that accurately traces out your blind spot
https://github.com/hyiltiz/profileblindspot

Last synced: 3 months ago
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An interactive game that accurately traces out your blind spot

• Host: GitHub
• URL: https://github.com/hyiltiz/profileblindspot
• Owner: hyiltiz
• License: gpl-3.0
• Created: 2021-10-05T05:24:42.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2021-10-05T23:45:19.000Z (over 3 years ago)
• Last Synced: 2025-02-10T05:41:52.165Z (4 months ago)
• Language: MATLAB
• Size: 1.78 MB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Demo

See this for yourself. Close your left eye, and look at the plus sign `+`

below, and slowly move your head closer to the `+` sign. Pay attention to the

money while trying to move your head into the sweet spot distance. Then what

happens?

Spoiler


The money disappears!

 


Note: if you are using your phone to look at this, it may barely work since

your phone screen is not wide enough. Simply replicate it on a piece of paper,

or try viewing your phone in horizontal mode.

```

    +                                        $

```

Where did the money go!? How about the following?

```

                                  $$$$$$$$$$$$$$$$$$$$$$

                                  $$$$$$$$$$$ $$$$$$$$$$

    +                             $$$$$$$$$$   $$$$$$$$$

                                  $$$$$$$$$$$ $$$$$$$$$$

                                  $$$$$$$$$$$$$$$$$$$$$$

```

How come the logo on the flag disappeared? 

# Explanation

The optic nerve (that transmits visual signal) goes right through the retina (the "camera sensor", so to speak).

Thus, we are effectively blind there. Inside the eye, these optic nerves are

closer to the nose. As a result, your right eye is blind slightly to your

right, regardless of what you are looking at. If you stretch your hands forward

next to each other with your palms facing down and look at your left pinky, the

blind spot of your right eye roughly corresponds to your right pinky direction.

See the model below as illustrated from behind the retina of the right eye.

![Blind spot on the retina](https://raw.githubusercontent.com/hyiltiz/ProfileBlindSpot/main/BlindSpotEyeball.gif)

As a result of the missing sensors in this region, you'll be blind within

corresponding region *in the world* (called the visual field), as illustrated

below for the right eye:

![Blind spot in the world](https://raw.githubusercontent.com/hyiltiz/ProfileBlindSpot/main/BlindSpotVisualField.png)

With this game, you can actually trace the out how *your very own* optic nerves

block your vision. Your blind spots were always there; it is just our

perceptual system was kind/smart enough to "fill in" the missing information

based on the surroundings.

# How to use

Run the program `ProfileBlindSpot.m` using `Octave` or `Matlab`. You'll need to

[install `Psychtoolbox`](http://psychtoolbox.org/download.html) as a

dependency. Follow the game

instructions. Once finished, the sub-function `analyzeBlindSpot` automatically

traces the blind spot boundary and its retinal map on a spherical eye model.

During the game, your mouse cursor turns into a highly visible and colorful

dot, using which you can then probe your own blind spot interactively.

The game looks like this.

![Game screen](https://raw.githubusercontent.com/hyiltiz/ProfileBlindSpot/main/raw.png)

Note that the boundaries are created with the `boundary(x,y)` function that

traces the boundary polygon given the point coordinate vectors. This function

is included in Matlab since R2014, but not in Octave by default.