Opticians Óptica Rieu

Has anyone been to these opticians, based in San Eugenio if so can you tell me if they are any good, i need my eyes testing. Do they speak English. What is the cost of eye testing in Tenerife, i read somewhere that it was free...is this correct......does it make a difference if you are receiving your state pension from England.

Had an arm on my specs break last month and went into Natural Optics Colon(San Eugenio) Had to purchase new frame at a cost of 49 euro,they sorted my lenses out to fit the new frame.
I asked about eye test told it was free,cost of new lenses from 199 ...