To purchase prescription eyeglasses at Walmart Vision Center, an appointment is not necessarily required for the purchase itself. However, it is essential to have an up-to-date prescription from an eye care professional to ensure that the glasses meet your specific vision needs. If you do not have a current prescription, it is advisable to schedule an eye exam with the optometrists available at Walmart Vision Center. The staff can assist you in checking your prescription status and inform you about setting up an eye exam if needed. Once you have the prescription, you can select your favorite frames and lenses directly at the Vision Center without the need for a prior appointment. For more detailed information about the process, including any specific policies for your local store, it may be helpful to visit the Walmart Vision Center website, where you can find contact information and additional details.