Contact lenses are medical devices, so you need a contact lens prescription in order to buy them, and your optometrist is required to make sure that your vision examination for your contact lens prescription involves finding the right fit for your lenses.
What is a Contact Lens Exam?
If you wear or want contacts, you need a contact lens exam in addition to a comprehensive eye exam. Your eye optometrist will perform special tests during a contact lens exam to evaluate your vision with contacts. The first test will measure your eye surface to determine what size and type of contacts are best for you. Your optometrist may also do a tear film evaluation to make sure you have enough tears to comfortably wear contacts.
With the results of those tests, your eye optometrist can provide a contact lens prescription that is the right fit for your eyes. An eyeglass prescription is no substitute for a contact lens exam because the two are very different. An eyeglass prescription measures for lenses that are positioned approximately 12 millimeters from your eyes; whereas a contact lens prescription measures for lenses that sit directly on the surface the eye. An improper fitting or prescription of contacts can damage the health of the eyes.
Once you have the correct fit and prescription for contacts, you’ll need to decide whether you want disposable contacts or extended wear, and if you want your contacts to be colored.
Your optometrist will fit you with a trial pair of contacts and have you wear them for a few days. In about a week, you’ll need a follow-up exam to make sure you have adjusted to your new lenses.
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