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How Often Should You Get a Lens Refraction Test?

Contact lens wearers should have their eyes examined at least once a year, according to the American Academy of Ophthalmology (AAO), although the frequency of refraction testing depends on their prescription and eye health. A refraction test measures how well the eyes focus light and identifies the lens power needed to correct nearsightedness, farsightedness, or astigmatism, while a separate contact lens evaluation checks lens fit and eye health. For adults ages 18 to 64 without symptoms or risk factors, the American Optometric Association recommends a comprehensive eye exam at least every 2 years, increasing to once a year for adults 65 and older. Contact lens wearers fall into a higher-risk category under the association's guidelines, making annual appointments particularly important for checking prescription changes and signs of contact lens complications. Blurred vision, frequent headaches, or difficulty focusing can also signal the need for an earlier refraction assessment rather than waiting until the next scheduled appointment.

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How Often Should You Get a Lens Refraction Test?

Contact lens wearers should have their eyes examined at least once a year, according to the American Academy of Ophthalmology (AAO), although the frequency of refraction testing depends on their prescription and eye health. A refraction test measures how well the eyes focus light and identifies the lens power needed to correct nearsightedness, farsightedness, or astigmatism, while a separate contact lens evaluation checks lens fit and eye health. For adults ages 18 to 64 without symptoms or risk factors, the American Optometric Association recommends a comprehensive eye exam at least every 2 years, increasing to once a year for adults 65 and older. Contact lens wearers fall into a higher-risk category under the association's guidelines, making annual appointments particularly important for checking prescription changes and signs of contact lens complications. Blurred vision, frequent headaches, or difficulty focusing can also signal the need for an earlier refraction assessment rather than waiting until the next scheduled appointment.

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What Happens During a Refraction Eye Exam?

During a refraction eye exam, an eye doctor measures how clearly each eye sees through lenses of different strengths to determine the correction needed for sharper vision. The test typically involves looking at an eye chart positioned about 20 feet (6 meters) away through an instrument called a phoropter, which holds multiple lenses that can be switched during the examination. As the lenses change, you'll be asked to compare two viewing options and identify which makes the letters appear clearer, helping the doctor fine-tune the prescription for each eye. Some exams also include an automated refractor or retinoscope that measures how light travels through the eye, giving the doctor an initial reading without relying on your responses. The final measurements are recorded in diopters for lens power, with additional values for astigmatism when needed, and can be used to determine the optical correction required for glasses or contact lenses.

How Long Does a Refraction Test Take?

A refraction test typically takes 10 to 15 minutes, depending on the complexity of your prescription and how easily your eyes respond to different lens adjustments. Automated refraction measurements can take approximately 2 to 4 minutes, while traditional subjective testing takes around 4 to 8 minutes, according to published clinical data. Patients with astigmatism, significant prescription changes, or difficulty identifying the clearest lens setting can require additional testing time to confirm their measurements. A complete eye examination generally takes 45 to 90 minutes when it includes other assessments of vision and eye health, making refraction only one part of the appointment. Contact lens wearers should also account for additional time when a fitting or prescription update is needed, particularly when the doctor needs to evaluate how the lenses sit and move on the eyes.

Is a Refraction Test the Same as a Contact Lens Exam?

No, a refraction test and a contact lens exam aren't the same, although both contribute to determining the right vision correction. A refraction test focuses on measuring prescription strength, while a contact lens exam includes additional assessments of the cornea's curvature, tear film, and eye surface to determine whether contact lenses will fit properly. During a contact lens fitting, the eye doctor also checks how trial lenses center on the eyes, move with blinking, and affect vision and comfort. Contact lens prescriptions require additional measurements, including base curve (BC) and diameter (DIA), which aren't included in standard eyeglass prescriptions. Even when your refraction results haven't changed, a contact lens evaluation is still necessary to confirm that your current lenses remain suitable for your eyes.

Can a Refraction Test Detect Eye Diseases?

A refraction test doesn't directly detect eye diseases, but its results can reveal vision problems that require further examination. When an eye doctor can't correct someone's vision to 20/20 with prescription lenses, it can indicate an underlying condition affecting the cornea, retina, or other parts of the eye. Conditions such as cataracts, glaucoma, and macular degeneration require additional testing, since refraction measurements alone can't identify the cause of reduced vision. A comprehensive eye exam includes procedures such as eye pressure measurements, visual field testing, and pupil dilation to examine the retina and optic nerve for abnormalities. Some eye diseases develop without early symptoms, so even people with clear vision and stable contact lens prescriptions should receive routine eye health examinations.

Learn More About Lens Refraction

Do you need to remove your contact lenses before a refraction test?

Your eye doctor might ask you to remove your contacts before testing to measure your vision without corrective lenses. Depending on the type of lenses you wear and the purpose of the examination, you could also be instructed to leave them out for a longer period before your appointment.

Can you get a refraction test while your eyes are dilated?

Yes, refraction testing can be performed with dilated pupils, particularly when the doctor needs to temporarily relax the eye's focusing muscles for more accurate measurements. Certain dilating drops can cause temporary blurred near vision and light sensitivity, which can last several hours after the examination.

Can you use an old prescription after a refraction test?

An older prescription can still be used to purchase contact lenses while it's valid and the prescribed lenses remain suitable for your eyes. Contact lens prescriptions generally remain valid for at least one year, although state laws can require longer expiration periods and certain medical conditions can justify shorter ones.

Can you get your refraction test results without buying contact lenses?

Yes, you can request your prescription without purchasing contact lenses from the same eye care provider. Under U.S. regulations, eye doctors must give patients a copy of their contact lens prescription once the fitting is complete, regardless of where they plan to purchase their lenses.

References

About Contact Lenses. Centers for Disease Control and Prevention. https://www.cdc.gov/contact-lenses/about/. Published May 27, 2025. Accessed October 26, 2026.

Buying Prescription Glasses or Contact Lenses: Your Rights. Federal Trade Commission. https://consumer.ftc.gov/articles/buying-prescription-glasses-or-contact-lenses-your-rights. Published date not verified. Accessed October 26, 2026.

Comprehensive Eye Exams. American Optometric Association. https://www.aoa.org/healthy-eyes/caring-for-your-eyes/eye-exams. Published date not listed. Accessed October 26, 2026.

Eye Exam and Vision Testing Basics. American Academy of Ophthalmology. https://www.aao.org/eye-health/tips-prevention/eye-exams-101. Published February 14, 2024. Accessed October 26, 2026.

Get a Dilated Eye Exam. National Eye Institute. https://www.nei.nih.gov/eye-health-information/healthy-vision/finding-eye-doctor/get-dilated-eye-exam. Published date not verified. Accessed October 26, 2026.

Refraction. MedlinePlus Medical Encyclopedia, National Library of Medicine. https://medlineplus.gov/ency/article/003844.htm. Reviewed January 20, 2025. Accessed October 26, 2026.

The Contact Lens Rule: A Guide for Prescribers and Sellers. Federal Trade Commission. https://www.ftc.gov/business-guidance/resources/contact-lens-rule-guide-prescribers-sellers. Published June 17, 2020. Accessed October 26, 2026.