ZENNI OPTICAL is where I have been getting mine for 20 years; they are great. Delivered to your door. All you need is to go to any optometrist and get a script, Some may say that you need to buy their glasses; tell them that you just need a script for your measurements and you will pay 100 or 200 baht for their services. Go to their site, pick your frames, and if you want Bifocal or multifocal, progressive, and anything else. Takes about 9 days for delivery. Half the price of any joint in Thailand. Go luck