Contact lens prescriptions and eyeglasses prescriptions are not the same. They are significantly different because eyeglasses lenses are positioned approximately 12 millimeters from your eyes, whereas contact lenses rest directly on the surface of your eyes. If you want to wear both contact lenses and eyeglasses, you will need too separate prescriptions. You can request a copy of your glasses prescription at the conclusion of your comprehensive eye exam. But a contact lens prescription cannot be written by your eye doctor and given to you until he or she performs a contact lens fitting or has access to your previous prescription and has evaluated the fit of your current lenses.