If your contact lenses still seem to provide clear vision, an expired prescription may feel like little more than a paperwork issue. However, contact lenses sit directly on the surface of your eyes, so renewing a prescription involves more than confirming that you can still read the eye chart.
 

At Palo Alto Eyes Optometry, we provide comprehensive contact lens exams and fittings to help make sure your lenses continue to fit properly, provide clear vision, and support healthy eyes.
 

Why Do Contact Lens Prescriptions Need Renewing?

Your eyes can change even when you do not notice a major difference in your vision. Prescription strength, corneal shape, tear-film quality, and contact lens tolerance may all change over time.
 

Regular contact lens exams allow us to evaluate these factors before renewing your prescription. A lens that worked well previously may eventually become less comfortable or may no longer fit your eyes as appropriately as it once did.
 

For Palo Alto contact lens wearers, routine follow-up is an important part of safe lens wear rather than simply an administrative requirement.
 

What Happens During a Contact Lens Exam?

A contact lens evaluation looks at both your vision and how the lenses interact with your eyes.
 

Depending on your current lenses and individual needs, we may evaluate:
 

• Whether your contact lens prescription has changed

• How the lenses center and move when you blink

• The shape and curvature of your corneas

• Tear-film quality and signs of dryness

• Redness, irritation, or other changes to the eye surface

• Whether your current lens design still suits your lifestyle
   

Tell us if your lenses feel comfortable in the morning but become dry, blurry, or irritating later in the day. Those details can help us understand how the lenses perform outside the exam room.
 

Why Is a Contact Lens Prescription Different From Glasses?

A glasses prescription and a contact lens prescription are not interchangeable. Glasses sit in front of your eyes, while contact lenses rest directly on the eye surface.
 

A contact lens prescription includes information related to the specific lens design and fit, not just the amount of vision correction you need.
 

This is why having an up-to-date glasses prescription does not automatically mean your contact lens prescription can be renewed without evaluating the lenses on your eyes.
 

What if Your Current Contacts Still Feel Fine?

Comfort is encouraging, but it does not tell us everything about eye health. Some contact lens-related changes may develop before you experience significant discomfort.
 

A professional exam allows us to look at the cornea and surrounding tissues for signs of irritation or other problems. It also gives us an opportunity to discuss whether newer lens materials, daily disposables, multifocal contacts, specialty lenses, or another option might better suit your current needs.
 

At Palo Alto Eyes Optometry, specialty contact lens options are also available for patients who need more customized vision correction.
 

When Should You Schedule an Exam Before Your Prescription Expires?

Do not wait for the expiration date if your lenses begin causing problems. Schedule an evaluation sooner if you develop recurring dryness, redness, fluctuating vision, or lenses that feel different from one eye to the other.
 

Significant pain, strong light sensitivity, discharge, or sudden vision changes require prompt eye care. Remove your contacts and avoid reinserting them until you have received appropriate guidance.
 

Safe habits remain important regardless of how long you have worn contacts. Follow the recommended replacement schedule, wash and completely dry your hands before handling lenses, and avoid sleeping, swimming, or showering in daytime contacts unless specifically instructed otherwise.
 

If your contact lens prescription has expired or your current lenses are no longer providing the comfort and clarity you expect, contact Palo Alto Eyes Optometry at 540 University Ave., Suite 110, Palo Alto, CA 94301 by calling (650) 321-2015 to schedule a contact lens exam and fitting.