Yes, GlassesShop requires customers to have a valid prescription to purchase prescription eyeglasses. This is important because the prescription ensures that the glasses are tailored to meet the specific vision needs of the individual. Generally, a prescription should include details such as the sphere, cylinder, axis, and pupillary distance, which are necessary for constructing the lenses accurately. However, for non-prescription eyeglasses, customers do not need a prescription. These options are available for those looking for fashion eyewear or blue light blocking glasses without vision correction. It is always advisable to check the current guidelines and requirements on the website of GlassesShop for the most up-to-date information regarding prescriptions and purchasing glasses.