From what you have told me something is going on here that makes no sense at all.
There is NO WAY a corneal abrasion has, or is, in any way contributing to what this employee, I mean his family (since his ability to use the phone was destroyed too), is telling you.
If his eye was so painful from the "never healing" corneal abrasion, why was he so comfortable waiting 3 weeks for ophthalmology care? Very strange.
I would not pay for any surgery or further treatment until you have a second opinion and all data concerning what you are being asked to pay for is shared with you. It might be wise to consult a lawyer as it seems like you are being taken for a ride.....
And, now, the obligatory word from our sponsors: :o)
I hope that this information was helpful for you. Please, allow me get credit for my time and effort in assisting you and press the ACCEPT button for this assist. I will be glad to answer additional questions until you are satisfied. Thank you very much.