It's possible that your eyes will need to adjust to prescription sunglasses. Your eyes will need to adjust for a while, just like with any new prescription. For a few days, you may have headaches or dizziness, but this should only last a few days. If you've been experiencing symptoms for more than a week, you should visit an optometrist to confirm you have the correct prescription. The adjustment process will be accelerated if you wear your sunglasses for an extended amount of time. Heavyglare has the best selection of Prescription Sunglasses in the United States at a fantastic price.