For 1.22 you only have to make 1 change (and you might have to reposition the items transforms)
You need to change 
class: "ItemWearable",

to

behaviors [ { "name": "Wearable" } ],

Hope that helps :)

WizardyBusiness That is honestly a good idea, I'll add it to the to-do for this mod. I've decided im not happy with the shade of brown either so I'll be adjusting that. 

It would be really cool to have more glasses options in general, since the only ones you can get in vanilla are small rectangular frames... any chance we could get a clear version of these?

Opaque lenses I'll look into, not sure if I can get it to look like glass. But yall this game doesnt have circles. all the models are just a series of squares. 

I would love to see a variation of this that had fully opaque lenses! I don't know much about modding, but do you reckon that'd be possible by opening up the .zip and replacing a texture somewhere?

EDIT: I didn't see this at first, but I absolutely agree with cheese_collector; I'd love to see circular lenses as well!

SilentRaven88 No, this is a simple item addition, no code involved. Even the vanilla glasses don't impact the nearsighted trait afaik. 

do they work like actual glasses or is it just cosmetic?

askin cuz of the nearsighted

fantastic mod, thank you for making it!

SovietSwede Maybe. Feel free to send me pictures/articles on what you mean. I am working on my other mods right now, but I will be coming back to this one to add more.

Amazing! Gonna download this right away.

How about adding goggles? a monocle? Ancient bone snow-goggles?

This belongs right up there with Expanded Foods and Primitive Survival.

woOOOooooo~
you should add circular metal glasses that come in each metal type!
OOOOoooOOOooooo~
this is the sound of you're procrastination warning youuuu!!~
OOOOoooOOOooooo!~