As for buying glasses, I used to go to Specsavers and Boots, a pair of varifocals with thinner lenses (I’m a +4.5 and pay extra for thinner lenses) cost around £350. I then found Asda opticians, designer frames, varifocal and thinner lenses £135 (£110 without ultra thin lenses).
https://opticians.asda.com/info/our-complete-price-on-glasses