Buying glasses in Spain

Not sure if under correct heading. My question is about buying glasses in Spain. Eyetest not needed as up to date and have prescription.

Firstly what is average price of buying glasses. We have no Spanish healthcare as we live in France but some countries are cheap anyway and will be there  Dec 10th/Jan 10th

My husbands lenses are damaged by sun ( bought in Greece) and really only needs new lenses, varifocal plus reactalite, will they put new lenses into owners existing frames? 

Are there decent reasonable opticians nearby?

I think there are British specsavers near Alicante anyone been..any good are they like UK.

Here in France prices are extortionate even with healthcare sceme plus mutual insurance. Non fancy frame,varifocal,reactalite type quote 1,200E and without health and insurance it was nearly 2,000E crazy prices and they will not repair existing or just sell new lenses, of course not - no money in it!,