I am not at all  sure we should be advertising supermarkets like Asda particularly as they will help put high street optometrists out of business but I recently read about  this price war  they started .  Could be useful if, because of your eye problems, you are going through a phase of having to change your glasses frequently, or if like me you have a habit of losing glasses.
The newspaper reported that the supermarket giant Asda has started a price war with high street opticians by launching an ‘all-round’ price for spectacles, regardless of the complexity of the prescription. They will cost £50 for standard frames and £70 for designer frames.