Do I Need a Separate Prescription for Contact Lenses?

Thinking about making the switch from glasses to contact lenses? You might be surprised to learn that you’ll need a different prescription for contacts than for glasses. While both are designed to correct your vision, contact lenses require more specific measurements and considerations to ensure a proper fit and optimal eye health.
 

Why Is a Contact Lens Prescription Different?

Glasses rest a short distance from your eyes, while contact lenses sit directly on the surface of the eye. Because of this difference in position, your contact lens prescription must account for additional factors that aren't needed for glasses, such as:
 

• Base curve and diameter: These measurements ensure the lens fits the shape of your eye properly.

• Lens material and brand: Different types of lenses may suit different needs, such as daily disposables, extended wear, or lenses for astigmatism.

• Oxygen permeability: Contacts need to allow enough oxygen through to keep your eyes healthy and comfortable.
   

A glasses prescription doesn’t include these details, which is why a separate evaluation is essential. At 4S Eyecare & Optometry, our contact lens exam and fitting process is designed to be thorough and personalized.
 

Comprehensive Eye Exam

The process begins with a comprehensive eye exam. Before fitting you for contact lenses, we conduct a full evaluation of your eye health and vision needs. This includes checking for any underlying conditions, updating your glasses prescription if necessary, and ensuring your eyes are healthy enough for contact lens wear.
 

Corneal Measurements

Next, we take corneal measurements using specialized instruments that map the curvature of your cornea. These measurements are crucial for determining the appropriate base curve and size of your contact lenses. A proper fit is essential to ensure that the lenses stay in place, provide clear vision, and feel comfortable throughout the day.
 

Tear Film Evaluation

A tear film evaluation is also an important part of the exam. We assess your eye’s natural moisture levels to determine whether your eyes produce enough tears to comfortably support contact lens wear. This step is especially important for patients who experience dry eye symptoms, as it helps us recommend the right type of lens material or treatment options to enhance comfort.
 

Lens Trial and Instruction

You’ll then be given a trial pair of contact lenses to wear in-office. This allows us to evaluate the fit, vision quality, and overall comfort of the lenses. If you’re new to contacts, we’ll also provide a hands-on training session where you’ll learn how to insert, remove, and properly care for your lenses to maintain healthy eyes and clear vision.
 

Follow-Up Appointment

Finally, we schedule a follow-up appointment after you’ve worn the trial lenses for a few days. This allows us to check how your eyes are adjusting and make any necessary changes to the lens type or prescription. Once everything looks good, we’ll finalize your contact lens prescription and help you order your supply.
 

Ready to Get Started with Contact Lenses?

A contact lens exam and fitting is a crucial step in getting the right prescription and ensuring your lenses are safe and comfortable to wear. At 4S Eyecare & Optometry, we’re here to guide you through the process and help you find the best lenses for your lifestyle and vision needs.
 

Ready to experience the freedom of contact lenses? Schedule your contact lens exam with 4S Eyecare & Optometry and let us help you find the perfect fit for your eyes. Visit our San Diego, California, or call (858) 675-2020 to book an appointment today.