Last year, I used my vision insurance to buy prescription glasses online after my local optician quoted double the price. I went with a retailer that accepted direct insurance billing—VSP in my case—so I didn't have to pay upfront and wait for reimbursement. The key was double-checking my coverage details first; I called my provider to confirm the frame allowance and lens add-on limits. One tip: upload your actual prescription (including your pupillary distance) and use the virtual try-on tool if the site has one—it saved me from ordering a pair that looked great on the model but didn't suit my face. Also, check the return policy before buying; I had to swap my first pair due to lens distortion, and the hassle-free return made a big difference. Buying online with insurance can be smooth, but only if you're careful with the fine print.