If you have never heard about them, they are a device used in medical field to train your eyes, especially nowadays that we spend lot of time in front of a screen.
I won't be listing the benefits, but here you can have a look:
The ones posted here have no medical approval, but I replicated the same dimensions reported in researched and commercial ones.
Hole size has to be between 0.9 - 1.2mm
Hole distancing has to be 2 - 3mm
Pattern on lenses shall be regular and perfectly symmetrical.
I will be investigating more about some studies about them.
Be sure you print them with the lenses on the print bed. This will guarantee a perfect regular hole shape.
Be sure you fine tune your printer (flow rate, horizontal expansion, holes compensation) cause the precision of the holes is essential and is the main point of this device.
I will be posting soon the articulate version (have a look at my original glass framehttps://www.thingiverse.com/thing:4361937).
If you want a pair like this with different shape or a different size or hole spacing, contact me.
Be sure you read the usage guidelines before using them and do it at your own risk.
Here some info:https://www.healthline.com/health/pinhole-glasses
Apart from this, just google them.
Hope you like them and enjoy it.
And if you want to leave a tip:https://ko-fi.com/lundreu