When purchasing new eyewear, several common pitfalls should be avoided to ensure optimal vision correction and physical comfort. Avoid guessing your pupillary distance, as an inaccurate measurement can cause chronic eye strain and headaches even if the prescription is correct. Do not skip essential lens coatings, such as anti-reflective layers or scratch-resistant treatments, which drastically improve durability and visual clarity. Finally, avoid buying cheap frames made from brittle plastics without checking frame dimensions against your face shape, and always verify that the retailer offers a clear, dependable return policy.