This wont beat the online prices for sending off a prescription then waiting for your new glasses to arrive from abroad. With only scratch resistance, they also wont compete with the number of free coatings offered from these online overseas offers, however, it is the cheapest you will pay to see an optician and get a pair of glasses in the UK - so handy if you have no access to online payment methods, or want to ask an optician questions about your sight.
Also, thanks to "Barky" who informs me Tesco offer you the "PD" value on your prescription, something other opticians either decline to tell you, or charge £20 for the ten seconds it takes to measure. Remember without this PD value measured correctly, your glasses bought online could not be as good as hoped, and yet here for half the price of being told your PD value, you are getting a pair of specs too.
I took a look today, and they seem robust enough despite the low price.
Until now I have been buying £2/3 readers, but liked the idea of trying a prescription pair as a first set of prescription glasses without breaking the bank to see if they are worth it over the cheap readers.
They cover the majority of prescriptions with minus to plus 5 for the Sphere, and minus to plus 2 for the cylinder, with the add of up to 3 for readers. So if you want then to address astigmatisms then most are catered for in the £10 price.
If you know a better deal, tell me please, as I want a pair bought locally before I try any of the online companies, and so knowing the PD is a must.