The reason is that contacts sit on your eyes, while eyeglass lenses rest a short distance in front of them. That throws off the requirements for your corrective lenses. During the exam, the optometrist or ophthalmologist will perform a variety of tests to gauge the health of your eyes and quality of vision.
Eye doctors are legally required to provide you with your prescription, whether you intend to buy new glasses from them or someone else. Shop Eyeconic Contact us at blog eyeconic. But that took a lot of business away from optometrists. Also, consumers were shopping round their prescriptions year after year, and no one was checking their eyes for worsening eyesight or other issues.
As a result, many states implemented laws limiting those prescriptions to just one year. In a few states, it is two years. But it's actually a good thing, according to the medical community, and even eyeglass providers. Doctors say you should have your eyes checked annually, to catch any changes in vision. But from the doesn't that stink file: why you sometimes can't use that prescription you get.
Your doctor may give you just an eyeglass prescription, which cannot be used to order contacts, and vice versa. Each has to be fitted to your eye. You cannot use an eyeglass prescription to purchase contacts.
If you get the wrong prescription, you'll say doesn't that stink? However, different state laws require different minimum prescription lengths, so we recommend checking your minimum eyeglass prescription expiration by state. So how long is an eyeglass prescription good for? Typically one to two years, but we recommend checking your prescription expiration date. That being said, if you are at higher risk of vision changes, your glasses prescription expiration date might be one year, rather than two, after your last exam.
However, if you feel like your eyesight may have changed, you may want to get a new prescription before purchasing new lenses. Reputable eyewear websites and retailers will reject expired glasses prescriptions. Plus, if a retailer is willing to sell you eyeglasses based on your expired Rx, you may want to steer clear of them anyway. Even if your eyeglasses prescription is not expired, it might still be time to get a new prescription and new eyeglasses if you can tell that your vision has changed.
Keep in mind, gradual changes to your eyesight or vision might not be obvious. But, you can watch out for a few common signs. If you are experiencing any of these signs or symptoms, we recommend making an eye appointment and getting your vision checked, even if your prescription is not expired.
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