Contact Lens Fittings
What to Expect from Your Contact Lens Fitting
A contact lens fitting is a specialized evaluation that ensures your lenses match the unique shape of your eyes and deliver clear, comfortable vision throughout the day. According to the CDC, approximately 45 million people in the United States wear contact lenses, representing about 16% of U.S. adults, and 93% of them wear soft contact lenses (CDC, 2024). Whether you are considering contacts for the first time or switching to a new lens type, a proper fitting is essential for both eye health and visual performance. At Greenwich Ophthalmology Associates, our contact lens specialists use precise diagnostic measurements and trial lens evaluations to find the ideal lens for every patient in the greater NY/CT region.
Your appointment begins with a discussion of your vision needs, lifestyle, and any previous experience with contact lenses. If you spend significant time on digital devices, we can discuss options that help address screen-related eye strain. Our contact lens specialists review your ocular history and perform a thorough examination of the front surface of your eye using a slit lamp, a specialized microscope that illuminates and magnifies the structures of the cornea, eyelids, and tear film. This step helps identify any conditions that may affect lens wear, such as dry eye syndrome or allergies.
Precise measurements of your cornea and surrounding eye structures are taken to determine the correct lens size and curvature. These include keratometry readings, which measure the curvature of the front surface of the cornea, as well as corneal diameter and pupil size assessments. For patients with irregular corneas or complex prescriptions, additional imaging such as corneal topography may be performed.
Based on your measurements and prescription, our contact lens specialists select a trial lens for you to wear during the appointment. The lens is placed on your eye so we can evaluate how it centers, moves, and interacts with your tear film. After wearing the trial lens for a short period, we check your vision with the lens in place and examine the fit under magnification. If the lens is too tight, too loose, or does not provide adequate vision, adjustments are made by selecting a different lens design, material, or base curve.
Why a Contact Lens Fitting Is Separate from an Eye Exam
A comprehensive eye exam focuses on determining your refractive error (the prescription that corrects nearsightedness, farsightedness, or astigmatism), screening for eye diseases, and assessing overall eye health. A contact lens fitting goes further by evaluating how a lens physically interacts with the surface of your eye. Because contact lenses rest directly on the cornea, factors like tear production, corneal shape, and lid anatomy all influence which lens will work best for you.
Contact lens prescriptions include parameters that are not part of a glasses prescription, such as base curve, lens diameter, and the specific lens brand or material. These values are determined during the fitting process and cannot simply be estimated from your glasses prescription. An improperly fitted lens can cause discomfort, blurred vision, or corneal damage over time, which is why this dedicated evaluation is so important.
The fitting process also includes teaching new wearers how to insert, remove, and care for their lenses safely. Proper contact lens hygiene reduces the risk of infection and other complications. Our contact lens specialists confirm that you can handle your lenses confidently before you leave the office.
Measurements Taken During a Contact Lens Fitting
Keratometry measures the curvature of the front surface of the cornea in multiple meridians. This measurement determines the base curve of your contact lens, which dictates how the lens aligns with your eye. A lens with the wrong base curve can move too much or too little with each blink, leading to discomfort or reduced oxygen flow to the cornea.
The horizontal visible iris diameter, sometimes called the white-to-white measurement, helps determine the overall diameter of the contact lens. Pupil size is also evaluated, particularly for patients being fitted with multifocal lenses, because the optical zones of these lenses must align with how the pupil changes size in different lighting conditions.
A healthy tear film is essential for comfortable contact lens wear. We assess tear production and tear quality to identify patients who may need lenses made from materials that retain more moisture or who may benefit from supplemental lubricating drops. Patients with borderline tear production can often still wear contacts successfully with the right lens choice and care routine.
For patients with astigmatism, keratoconus, or prior refractive surgery, corneal topography provides a detailed map of the entire corneal surface. This technology captures thousands of data points and reveals subtle irregularities that standard keratometry may miss. The resulting map helps our team select specialty lenses that conform to the cornea more precisely.
How Long a Contact Lens Fitting Appointment Takes
A straightforward fitting for a patient with a mild prescription and healthy corneas typically takes 30 to 60 minutes. More complex fittings, such as those for multifocal contact lenses or toric lenses for astigmatism, may require additional time because multiple trial lenses often need to be evaluated before the best option is identified.
First-time wearers should expect a longer visit because the appointment includes both the fitting itself and hands-on training with lens insertion and removal. Experienced wearers returning for a routine refitting or lens update typically have shorter appointments since they already know how to handle their lenses. In some cases, a follow-up visit is scheduled within one to two weeks to verify the fit after you have worn the lenses in your daily routine.
If you are new to contact lenses, a dedicated portion of your appointment is spent practicing lens insertion and removal under the guidance of our staff. This training helps you develop the confidence and technique needed to handle your lenses safely at home. We do not rush this process, and new wearers should plan for extra time during their first visit.
Frequently Asked Questions
The lens type recommended for you depends on your prescription, lifestyle, and eye health. Common options include daily disposable and monthly replacement soft lenses for everyday wear, toric soft lenses designed to correct astigmatism, multifocal lenses for patients who need help with both distance and near vision, and rigid gas permeable lenses for patients who need sharper optics or have irregular corneas. Our contact lens specialists discuss the advantages and limitations of each option so you can make an informed decision based on your priorities.
Patients with very flat or very steep corneas may find that certain lens brands fit better than others, since each manufacturer offers a limited range of base curves. Significant differences in curvature between the two meridians of the cornea indicate astigmatism, which typically requires a toric lens design. During your fitting, we match your curvature readings to the lens options that offer the most stable and centered fit for your particular corneal shape.
A trial lens is placed on your eye and you are asked to wear it for roughly 10 to 20 minutes so it can settle into position. Our team then re-examines the lens under magnification to assess its centering, movement with each blink, and edge alignment against the cornea. Your vision is tested at multiple distances, and you are asked about comfort.
Contact lens prescriptions in the United States are valid for one to two years depending on state regulations. Even if your prescription has not changed, an annual contact lens evaluation allows us to confirm that your lenses continue to fit well, that your corneal health remains stable, and that your current lens type still meets your needs. Changes in tear production, corneal shape, or visual demands over time can warrant a lens update.
A glasses prescription accounts for the distance between the lens and your eye, known as the vertex distance. Because contact lenses sit directly on the cornea, the corrective power often needs to be adjusted, especially for higher prescriptions. A contact lens prescription also specifies the base curve, diameter, and exact lens brand or model, none of which appear on a glasses prescription.
Yes. Patients with astigmatism can wear toric contact lenses, which have different corrective powers along different meridians to compensate for the uneven curvature of the cornea. Patients with presbyopia, the gradual loss of near focusing ability that typically begins in the early to mid-40s, can benefit from multifocal contact lenses or a monovision approach, where one eye is corrected for distance and the other for near.
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