Ocular melanoma

Hello everybody, I've had ocular melonoma. I had the tumour removed followed by Radiotherapy plate fitted then chemotherapy eye drops. 
I had a check up appointment on Friday. I'm lucky that I am in remission. However there is an area of my eye that is being monitored and I have a few moles on my iris.ive been advised to wear sunglasses when it is bright outside. I do wear prescription glasses all the time so sunglasses would have to be prescription as well. I don't work so have very limited income. Do you know if I may be able to get free sunglasses or a grant from somewhere? Thank you.