Others may disagree, but my opinion is that before this person participates in your jewelry workshop that she should get a note from her Ophthalmologist or doctor (not an Optometrist) giving her permission to take your workshop. Ideally this note will list the student’s limitations and any restrictions within the workshop. I also think that that the student should sign a separate liability waiver to relieve you (the teacher) from any potential liability.
In many ways, you’re asking a medical question about a serious eye issue. My opinion is that as a jewelry teacher that you shouldn’t be in the middle of it.
There was a thread about an Orchid member with macular degeneration last spring. You may find that to be of some help.
All the best!!
Jeff