A routine eye exam measures vision and checks for eye disease. A contact lens exam keeps all of that and adds a set of measurements and steps that are specific to fitting a medical device directly on the surface of the eye.
Your eye doctor measures the curvature of your cornea (the clear dome at the front of the eye), the diameter of your visible eye opening, and the quality of your tear film. None of these numbers appear on a glasses prescription. They determine how a contact lens will sit on your eye and whether it will remain comfortable through a full day of wear. Check out our Insight Vision Optometry for a contact lens exam.
Your eye doctor places a trial contact lens on each eye during the visit. The lens is then observed under a slit lamp microscope, a magnified instrument used to examine the front of the eye, to check centering, movement with each blink, and edge position. This step confirms that a prescription works as well in practice as it does on paper.
The FDA classifies contact lenses as medical devices because they rest directly on the cornea and carry a real risk of infection if not properly fitted or cared for. A contact lens exam is the required step for issuing a legal, current contact lens prescription, and it is billed separately from a standard eye exam for that reason.
A contact lens exam includes all the elements of a comprehensive eye exam. Your eye doctor evaluates the back of the eye, screens for glaucoma, and looks for any corneal changes caused by past contact lens wear. Long-term wearers can develop quiet changes that cause no symptoms, and the yearly contact lens visit is where those changes are caught early.
The visit follows a clear sequence. Each step builds toward a lens prescription that is matched to your eyes, your vision needs, and your daily routine.
The visit begins with questions about your overall eye health, allergies, current medications, and how you plan to use your contacts during the day. If you already wear contact lenses, bring your current lens boxes along with your wearing schedule. If you are new to contacts, think ahead about the activities you want your lenses to support, such as long hours at a screen, sports, or night driving, so we can guide you toward the right options from the start.
Your eye doctor measures your prescription using a refractor, an instrument with a series of lenses that helps determine the clearest vision correction for each eye. Dilating drops are often used so the doctor can examine the retina and the lens inside the eye. The drops wear off over a few hours, and your eyes may feel sensitive to light during that time, so bringing a pair of sunglasses is a good idea.
A topographer or keratometer precisely maps the curve of your cornea. A fluorescein dye, a safe orange dye viewed under a blue light, shows how quickly the tear film breaks apart between blinks. A stable tear film is essential for comfortable contact lens wear throughout the day, and a thin or unstable tear film may influence which lens material your eye doctor recommends.
A trial pair is placed on your eyes and allowed to settle. Your eye doctor then asks about clarity and comfort and examines the lens under the slit lamp. If the fit is correct, you leave with a trial supply and a scheduled follow-up. If adjustments are needed, a different base curve, diameter, or lens brand is tested at the same visit.
New wearers practice putting lenses in and taking them out in the office before going home. Our staff observe the technique and offer guidance so you feel confident on your own. You also receive detailed instructions covering solution use, case hygiene, and the wearing schedule appropriate for your specific lens type. Building these habits from the start is one of the most important steps for avoiding eye infections.
A contact lens prescription contains more information than a glasses prescription. Each element plays a role in how the lens fits, performs, and protects your eye health.
The prescription lists the corrective power for each eye. A minus number corrects nearsightedness (difficulty seeing at a distance), and a plus number corrects farsightedness (difficulty seeing up close). If astigmatism is present, the prescription also includes a cylinder power and an axis number that direct how the lens must be positioned on the eye.
The base curve (BC) describes the inner curvature of the lens, and the diameter (DIA) describes its width. These two numbers determine how the lens rests on the cornea. The same corrective power can feel comfortable in one lens and miserable in another if the base curve or diameter does not match your eye's shape. A glasses prescription does not include these values.
A contact lens prescription specifies a brand and material, not just a power. Two lenses with identical powers can have different water content, oxygen transmission, or edge design. Those differences affect comfort and long-term corneal health. The brand listed is the one confirmed to fit your eye at the time of the exam, and switching to a different brand requires a new fit check.
Your prescription carries an expiration date, typically around one year from the exam. It also notes the replacement schedule for your lens type, whether that is daily, two-week, or monthly. Your eye doctor sets these timelines based on the lens material and the health of your eyes. Using a lens beyond its scheduled replacement increases the risk of deposit buildup and irritation.
Consistent follow-up is part of safe contact lens wear. Knowing when to come in on schedule and when to come in sooner helps protect your vision and your corneal health.
Most contact lens wearers visit their eye doctor once per year. This visit renews the prescription, evaluates the fit, and allows the doctor to monitor for any gradual corneal changes caused by ongoing lens wear. Major eye care organizations support this yearly schedule as the baseline for continued safe wear.
New wearers have a short follow-up appointment, typically one to two weeks after the initial fitting. Your eye doctor assesses how the lens has been performing after regular daily use. Small adjustments to lens parameters are made at this visit if needed. This follow-up is part of the fitting process, not a separate billed exam.
Certain changes in how your lenses feel or how your eyes look are worth calling about right away. These include worsening vision while wearing your contacts, increasing redness, new or worsening dryness, a shorter comfortable wearing window, pain, light sensitivity, or any discharge. Contact your eye doctor within a day or two if any of these appear rather than waiting for the next scheduled exam.
Years of contact lens use can cause changes that develop slowly and produce no noticeable symptoms. New blood vessels may begin growing into the cornea, or the eye may retain fluid beneath the lens at night. These findings are visible under the slit lamp well before they cause discomfort. The yearly exam is the safety net that keeps small changes from progressing into larger problems that affect your ability to wear contacts at all.
Here are answers to questions we hear often about the contact lens exam process, including a few situations that call for more urgent attention.
If you currently wear contacts, put them in at least an hour before your visit so your eye doctor can see how the lens performs after a short wear period. Bring your current lens boxes, a pair of sunglasses in case dilation drops are used, and a list of the activities you want your lenses to support. If you wear glasses only, simply bring your frames so the prescription can be referenced.
If dilation drops are part of your visit, your close-up vision may be blurry and your eyes may be sensitive to bright light for a few hours afterward. Driving in those conditions can be uncomfortable, so arranging a ride is a good precaution. If you are unsure whether your exam will include dilation, ask when you schedule, since not every visit requires it.
Yes. Your eye doctor can discuss lens options designed for active use, including daily disposables suited for part-time sports wear or lenses that hold up well during extended or physically demanding days. Mentioning your activities upfront helps us fit a lens that handles both your regular routine and the demands of any specific hobby or sport.
This is more common than most patients expect, especially after years of wearing the same brand. Your prescription power may have shifted, your corneal shape may have changed, or better materials may now be available for your needs. Your eye doctor will walk through the specific options with you, whether that means a new brand, a different replacement schedule, or a material better suited to your tear film. You leave with a clear plan, not uncertainty.
Many vision plans include a yearly contact lens exam, though coverage details vary widely by plan. Vision insurance often separates the exam benefit from the contact lens fitting fee, so both components may have different coverage levels or copays. Checking with your plan before the visit, or asking our front desk to verify your benefits, helps you understand costs in advance and avoids surprises at checkout.
A gap in care is never a reason to delay coming in further. Many patients return after years away and simply need an updated prescription along with a fresh evaluation of their corneal health. Your eye doctor approaches the visit without judgment, focusing on where your eyes are now and how to get you back on a safe and comfortable wearing schedule going forward.
Whether you are new to contact lenses or a long-term wearer who is ready for an update, our team is here to guide you through every step of the fitting process. We bring specialty-level expertise and advanced technology to every contact lens evaluation, ensuring your lenses fit well, see clearly, and keep your eyes healthy for the long term. We look forward to seeing you.
