This is a paid asset, but now you can download UMA Spectacles pack for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
UMA Spectacles pack v1.0
Contains 8 Spectacles for Male and Female
Secret Anorak tutorials
RPG starter 1 setup (For reference only. RPG 1 is not required)
Convert UMA to Standalone Humanoid tutorial
How to Add new Materials via Substance Painter tutorial