Contact Lens Exam in Chattanooga: What to Expect

By East Ridge Eye Center Editorial Team

What Happens During a Contact Lens Exam?

A contact lens exam at East Ridge Eye Center follows a structured clinical sequence designed to produce a safe, accurate lens prescription.

The appointment typically includes these steps:

Medical history review — The clinician asks about prior lens wear, any history of dry eye syndrome, allergies, or conditions such as keratoconus that affect corneal integrity.
Comprehensive refraction — A phoropter test determines the corrective power needed to achieve 20/20 or best-corrected visual acuity. This differs from a simple screening because it measures sphere, cylinder, and axis values precisely.
Keratometry — An instrument called a keratometer (or automated corneal topographer) maps the curvature of the cornea. The result, expressed in diopters, determines the base curve of the contact lens.
Pupil and iris diameter measurement — These measurements confirm the correct lens diameter so the lens centers properly and does not cause glare at night.
Tear film assessment — The Schirmer tear test or a slit-lamp evaluation checks whether the patient produces enough tears to keep a soft lens hydrated. Patients with chronic dry eye may be directed toward daily disposable lenses such as Alcon DAILIES TOTAL1 or CooperVision Clariti 1 day, which have high water content and low friction.
Trial lens insertion and evaluation — The clinician places a diagnostic lens on the eye and examines fit, centration, and movement under a slit lamp. The patient also reads an acuity chart with the trial lens in place.
Follow-up and final prescription — After a short adaptation period, the final contact lens prescription is written. In Tennessee, this prescription is legally valid for one year and must be provided to the patient upon request under the Federal Trade Commission's Contact Lens Rule.

The entire process is non-invasive. Most patients leave the same day with a trial pair and printed care instructions.

How Does a Contact Lens Exam Differ from a Regular Eye Exam?

A regular eye exam and a contact lens exam share some steps but are not interchangeable. The distinction matters both clinically and financially.

A standard comprehensive eye exam covers visual acuity, refraction, eye health screening for conditions like glaucoma and macular degeneration, and an internal eye pressure check (tonometry). It produces a spectacle prescription — a flat lens power — but it does not account for the three-dimensional relationship between the contact lens and the corneal surface.

A contact lens exam adds the following that a standard exam omits:

Keratometry or corneal topography — Essential for confirming that the lens base curve matches the cornea. A mismatch as small as 0.3 diopters can cause lens rotation in toric lenses for astigmatism, blurring vision.
Fit evaluation at the slit lamp — The practitioner checks that the lens moves 0.5–1.0 mm with each blink, the benchmark published in the Contact Lens Spectrum clinical guidelines.
Material selection — Options range from daily soft lenses to rigid gas-permeable (RGP) lenses made from materials like Contamac Boston XO2 for patients with high astigmatism or keratoconus.
Patient education on insertion, removal, and replacement schedule — The U.S. Centers for Disease Control and Prevention (CDC) reports that approximately 1 million Americans visit a doctor each year for contact lens-related eye infections, most linked to improper hygiene or over-wear.

Because of these additions, insurance companies, including VSP Vision Care and EyeMed, often list a contact lens fitting fee as a separate line item from the comprehensive exam charge. Patients at East Ridge Eye Center should verify their specific benefit tier before their appointment.

Who Needs a Specialized Contact Lens Exam in Chattanooga?

Most contact lens candidates benefit from a standard soft lens fitting. Several patient groups require a more detailed evaluation.

Patients with Astigmatism

Toric contact lenses, designed for astigmatism, use a weighted lower edge to maintain rotational stability. A small error in corneal curvature measurement — or a missed axis reading — causes blurred, unstable vision. Brands such as Bausch + Lomb ULTRA for Astigmatism and Johnson & Johnson ACUVUE OASYS for Astigmatism are commonly fitted at practices in the Chattanooga area, but only after precise keratometry confirms the correct parameters.

Presbyopic Patients Over 40

After age 40, most adults develop presbyopia, the gradual loss of near-focusing ability. Multifocal contact lenses — including CooperVision Biofinity Multifocal and Alcon AIR OPTIX plus HydraGlyde Multifocal — require additional fitting steps to balance distance and near zones for each individual eye.

Children and Teenagers

Myopia (nearsightedness) progression in school-age children has increased sharply. The 2021 Brien Holden Vision Institute global report projected that 50% of the world's population will be myopic by 2050. Myopia management lenses — such as MiSight 1 day by CooperVision, FDA-approved in 2019 for slowing myopia progression in children ages 8–12 — require an exam protocol that includes axial length measurement and parental education.

Patients with Dry Eye or Previous Refractive Surgery

LASIK and PRK reshape the cornea, altering the base curve values a clinician would normally measure. Post-surgical patients require corneal topography, not just standard keratometry, to arrive at an accurate lens fit.

Patient Profile	Additional Test Needed	Typical Lens Type
Standard myopia/hyperopia	Basic keratometry	Soft spherical daily or monthly
Astigmatism	Axis measurement, rotational stability check	Toric soft or RGP
Presbyopia (40+)	Dominant eye test, near-add power trial	Multifocal soft
Keratoconus	Corneal topography	Scleral or RGP
Post-LASIK	Topography, elevation maps	Custom soft or scleral

Why Choose East Ridge Eye Center for Your Contact Lens Exam?

East Ridge Eye Center serves patients in the Chattanooga, Tennessee metropolitan area with a focus on timely, personalized eye care. The practice emphasizes that patients should not delay receiving appropriate care — uncorrected refractive error and poorly fitted lenses both carry real clinical consequences.

Several factors distinguish an ophthalmology-based contact lens exam from a retail optical chain fitting:

Medical-grade diagnostic equipment — Corneal topographers used in clinical settings produce higher-resolution curvature maps than the automated screeners common in retail settings, which matters for toric and scleral lens fittings.
Co-management of systemic conditions — Chattanooga has a relatively high prevalence of type 2 diabetes, which causes diabetic retinopathy and dry eye that complicate contact lens wear. An ophthalmology practice can manage these conditions concurrently.
Access to specialty lenses — Scleral lenses, custom RGP lenses, and orthokeratology (overnight corneal reshaping) lenses require fitting expertise not universally available at optical retail locations.
Continuity of care — A single provider who knows a patient's corneal history can catch subtle changes — such as early corneal neovascularization from over-wear — before they become serious.

East Ridge Eye Center accepts most major vision and medical insurance plans. Patients are encouraged to call ahead to confirm whether their plan covers the contact lens fitting fee as a separate benefit or bundles it with the comprehensive exam allowance.

How Often Should Chattanooga Patients Schedule a Contact Lens Exam?

Contact lens prescriptions in Tennessee are valid for 12 months from the date of the exam. The American Academy of Ophthalmology (AAO) recommends annual contact lens evaluations regardless of whether vision has changed, for three clinical reasons.

First, the cornea's shape can shift subtly over time — particularly in younger patients whose prescriptions are still stabilizing, or in patients developing early keratoconus. Annual topography catches these changes before the lens fit becomes compromised.

Second, lens materials degrade and new options enter the market each year. A patient currently wearing a monthly lens from 2019 may benefit from switching to a newer daily disposable with a silicone hydrogel surface that transmits more oxygen. The Dk/t value (oxygen transmissibility) of modern daily lenses has increased significantly; the Alcon DAILIES TOTAL1, for example, carries a Dk/t of 156, compared to older hydrogel monthlies that often measure below 30.

Third, annual exams allow the clinician to monitor for complications. The CDC's Healthy Contact Lens Habits campaign identifies sleeping in lenses not approved for extended wear and topping off solution in a case as the two most common behaviors leading to Acanthamoeba keratitis, a severe corneal infection.

Patients who experience redness, discharge, sudden blurring, or pain while wearing lenses should schedule an urgent appointment rather than waiting for an annual renewal.

How to Prepare for Your Contact Lens Exam in Chattanooga

Arriving prepared shortens the appointment and improves the accuracy of the exam results.

Before the appointment: - Remove soft contact lenses at least 2 hours before the exam. Lenses slightly alter corneal curvature, and wearing them up to the moment of testing skews keratometry readings. - Remove rigid gas-permeable (RGP) lenses at least 3 days before a corneal topography session, per ANSI Z80.20 standards for contact lens measurement. - Bring any current contact lens boxes or packaging. The brand name, base curve, diameter, and power printed on the box give the clinician a useful starting baseline. - List all medications, including antihistamines, antidepressants, and blood pressure drugs. Many of these reduce tear production and influence lens material selection. - Bring valid insurance cards, including both medical and vision plan cards, since portions of the exam may bill to each separately.

During the exam: - Be direct about comfort issues with current lenses — end-of-day dryness, halos around headlights at night, or difficulty with lens removal are all clinically useful data points. - Ask the clinician to explain the trial lens parameters selected, including base curve, diameter, and replacement schedule. A correct vision starts with understanding the prescription.

After the exam, patients typically leave with a trial lens supply, a printed or electronic prescription, and written care instructions. Follow-up calls within one to two weeks are standard practice at East Ridge Eye Center to confirm the fit is comfortable in real-world conditions.

Frequently Asked Questions

How much does a contact lens exam cost in Chattanooga?

A contact lens exam in Chattanooga typically costs between $100 and $200, separate from the comprehensive eye exam fee, though prices vary by practice and complexity of the fitting. Insurance plans such as VSP Vision Care and EyeMed often cover a portion of both fees. Specialty fittings — for scleral lenses or orthokeratology — may run higher. Patients should call East Ridge Eye Center before their appointment to confirm their specific plan's contact lens fitting benefit.

Do I need a separate exam if I already have a glasses prescription?

Yes. A glasses prescription does not include the corneal curvature measurements, lens diameter specifications, or slit-lamp fit evaluation required for a valid contact lens prescription. Under the FTC Contact Lens Rule, a contact lens prescription must be issued separately and must list the brand, base curve, diameter, and expiration date. A clinician who provides only a spectacle prescription is not legally authorized to release a contact lens prescription from that data alone.

How long does a contact lens exam take?

A standard contact lens exam takes 45 to 60 minutes, which includes the refraction test, keratometry, trial lens insertion, slit-lamp evaluation, and patient education. Complex fittings — for multifocal lenses, toric lenses for high astigmatism, or scleral lenses — may require 75 to 90 minutes plus one or more follow-up visits to finalize the prescription. First-time wearers should budget extra time for insertion and removal training.

Can children get a contact lens exam in Chattanooga?

Yes. Children as young as 8 years old are candidates for contact lenses, particularly FDA-approved myopia management options like CooperVision MiSight 1 day. The American Academy of Ophthalmology does not set a minimum age; instead, the clinician evaluates the child's maturity, hygiene habits, and motivation. A contact lens exam for a child includes the same corneal measurements as an adult exam, plus a discussion with parents about daily care responsibilities and replacement schedules.

What is the difference between a contact lens prescription and an eyeglass prescription?

An eyeglass prescription lists sphere, cylinder, and axis power for a lens that sits roughly 12 mm from the eye. A contact lens prescription includes those same values but also specifies base curve (the curvature of the back surface of the lens), lens diameter, brand, and material — all determined by direct measurement of the patient's cornea. Using an eyeglass prescription to order contact lenses without a proper fitting is unsafe and is prohibited under U.S. federal law.

What happens if my contact lens does not fit correctly?

A poorly fitted contact lens can cause corneal hypoxia (oxygen deprivation), mechanical abrasion, giant papillary conjunctivitis, or in severe cases corneal ulcers. The CDC estimates that 1 million Americans seek medical care for contact lens-related eye problems annually. Symptoms of a poor fit include persistent redness after lens removal, end-of-day blurring, lens awareness or discomfort, and unusual discharge. Patients experiencing these symptoms in Chattanooga should schedule a re-evaluation promptly rather than continuing to wear the current lens.

Conclusion

A contact lens exam is more than a formality before placing a lens order — it is the clinical foundation that determines whether a lens will be safe, comfortable, and optically correct for a specific person's eyes. The measurements taken during a proper fitting at a qualified practice protect corneal health, catch evolving conditions early, and ensure the prescription reflects current visual needs.

For Chattanooga residents ready to pursue clear, comfortable contact lens wear, East Ridge Eye Center provides thorough evaluations, specialty fitting options, and the continued care that accurate vision requires. Scheduling an appointment is a straightforward first step toward a correct vision — and one that should not be put off.