An eyeglass prescription contains valuable information regarding your visual needs and vision correction. To those with little or no optical knowledge, how an eyeglass prescription is written may look like a chaotic mess of symbols, letters and numbers. Each component of an eyeglass prescription represents a very important value that tells your eye care practitioner a lot about your eyes, sight, and vision correction needs. When getting eyeglasses, your optician will read your prescription and determine which lens options are best suited to what has been prescribed by your optometrist.