1. The first thing you need to buy prescription glasses online is a prescription. The best way to get an accurate prescription is to visit an optometrist and have an eye exam, which tends to cost around $100. After the test is complete, you need to make sure you get a hard copy of your prescription so you can retain it for your records. Alternatively, you can pick up a device like the $99 EyeQue Vision Check (out of stock) to use your smartphone to check your vision and create a prescription that many online glasses stores will accept, although some do require an Rx from an optometrist.
2. Get your pupillary distance number from your optometrist or measure it yourself. Be aware that sometimes optometrists won’t give your pupillary distance because they’ll say they want to measure you for a specific set of glasses. Insist on getting one because it’s required to order glasses online….
