Specialty Lens Fitting Process for Keratoconus
Why Keratoconus Requires Specialty Contact Lenses
In keratoconus, the normally round and smooth cornea gradually weakens and starts to bulge outward in an irregular cone shape. This distortion scatters light as it enters the eye, causing blurred and distorted vision that changes as the condition progresses.
The thinning and stretching of corneal tissue can create high levels of irregular astigmatism that cannot be corrected with standard eyewear. The cone may be centered or off-center, and each eye often has a different pattern of distortion.
Regular eyeglasses can only correct the basic prescription error, but they cannot compensate for the irregular surface of a cone-shaped cornea. Soft contact lenses drape over the cornea and tend to follow its distorted shape, which means they do not provide the smooth surface needed for clear vision.
As keratoconus advances, both glasses and standard soft lenses become less effective, and you may notice increasing glare, halos around lights, and difficulty with tasks like reading or driving.
Specialty contact lenses create a new, smooth front surface for light to pass through by either vaulting over the irregular cornea or providing a rigid surface that masks its shape. The tear layer that fills the space between the lens and cornea also helps smooth out irregularities.
- The rigid or semi-rigid material holds its shape instead of conforming to the cone
- A liquid tear lens fills in gaps between the contact and the cornea
- Light rays focus properly on the retina, restoring clear and stable vision
- Many patients achieve vision quality that matches or exceeds what they had before keratoconus developed
Most people with keratoconus at any stage can benefit from specialty contact lenses if they are motivated to learn proper handling and care. We may recommend this option if your glasses no longer provide adequate vision or if you want the clearest possible sight for work, school, or daily activities.
Candidates should have healthy eyelids and tear film, be willing to attend multiple fitting appointments, and commit to a daily lens care routine. If you have significant eye allergies, chronic dry eye, or difficulty with hand dexterity, we will discuss modifications or alternatives during your consultation.
Types of Specialty Lenses We May Recommend
RGP lenses are made from a firm, oxygen-permeable material that holds a stable shape on the eye. They rest on the cornea and center themselves with each blink, creating a tear reservoir that fills in the irregular surface beneath.
These lenses tend to be smaller in diameter and may move slightly with blinking, which some patients feel as initial awareness on the eye. RGP lenses are often the first option we consider for mild to moderate keratoconus because they are durable, provide excellent optics, and allow good oxygen flow to the cornea.
Scleral lenses are larger-diameter rigid lenses that vault entirely over the cornea and rest on the white part of the eye, called the sclera. They create a fluid-filled chamber over the cornea, which not only corrects vision but also protects and hydrates the eye surface.
- The lens does not touch the sensitive corneal cone, improving comfort for many patients
- They remain stable and centered throughout the day with minimal movement
- The fluid reservoir can soothe eyes that are also dry or irritated
- Scleral lenses are often recommended for moderate to advanced keratoconus or when RGP lenses are uncomfortable
Hybrid lenses combine a rigid gas permeable center with a soft outer skirt, offering the clear optics of a rigid lens with the comfort and stability of a soft lens. The rigid center vaults over or aligns with the cone while the soft edge sits gently on the surrounding eye.
We may suggest hybrid lenses if you have trouble adapting to the sensation of RGP lenses but still need the optical quality that a rigid surface provides. These lenses require careful handling during insertion and removal to avoid tearing the junction between the two materials.
A piggyback system involves wearing a soft contact lens as a base layer and a rigid gas permeable lens on top of it. The soft lens acts as a cushion that increases comfort, while the RGP lens provides the vision correction.
This approach may be considered in specific cases when an RGP lens alone causes discomfort or does not center well. Piggyback systems require extra care to prevent complications such as reduced oxygen to the cornea or increased risk of infection, so we monitor these fittings closely.
Our eye doctor selects a lens design based on the severity and location of your corneal cone, the health of your eye surface, your lifestyle needs, and your ability to handle and care for the lenses. We also consider your previous experience with contacts and any comfort or vision issues you have had.
- We review detailed corneal maps to see the exact shape and steepness of your cone
- We assess your tear film quality and eyelid function
- We discuss your daily activities, hobbies, and vision goals
- We may try different lens types during fitting appointments to compare comfort and clarity
What to Expect During Your Specialty Lens Fitting Appointments
Your first fitting visit includes advanced imaging called corneal topography or tomography, which creates a detailed three-dimensional map of your cornea's shape. These measurements show us the exact location, size, and steepness of the cone, as well as areas of thinning.
We also measure the curvature of your sclera if we are considering scleral lenses, along with your pupil size, eyelid position, and tear quality. All of this information helps us select the best starting lens design and parameters for your eyes.
During your fitting appointments, we place trial lenses on your eyes to evaluate how they fit, move, and center. You will wear each diagnostic lens for a few minutes while we examine the alignment and assess any areas of touch or excessive clearance.
- We use special dyes and lights to see the tear layer beneath the lens
- We watch how the lens behaves when you blink and look in different directions
- We ask about your comfort level and any pressure or irritation you feel
- We may try several different lens designs in one visit to find the best match
Once a diagnostic lens is on your eye, we check your vision with an eye chart to confirm that the lens provides the clarity you need. We also observe the lens under magnification to ensure it is not too tight, too loose, or resting on the apex of the cone in a way that could damage tissue.
Comfort is important for long-term success, so we ask detailed questions about any scratching, burning, or foreign body sensation. A well-fitted specialty lens should feel tolerable from the start, with awareness decreasing as you adapt over the first few weeks.
After we determine the ideal lens type, size, and curvature, we place an order with the manufacturer for your custom lenses. Many specialty lenses are made to order based on the unique measurements of your eyes, so production can take anywhere from a few days to several weeks.
We will let you know the expected timeline and contact you when your lenses arrive. In some cases, we may need to order a second set if the first lenses require further adjustments after you wear them in real-world conditions.
When your custom lenses are ready, you return to the office for a final fitting and dispense appointment. We place the lenses on your eyes and perform the same detailed evaluation of fit, movement, and vision that we did with the diagnostic lenses.
- We verify that the prescription and fit match what we ordered
- We teach you how to insert, remove, and care for your new lenses
- We provide a wearing schedule and answer all your questions
- We schedule your first follow-up visit to monitor your progress
Learning to Use and Care for Your Specialty Lenses
We provide hands-on training in the office to teach you how to safely insert and remove your specialty lenses. The technique varies depending on the lens type, with scleral lenses requiring a different approach than smaller RGP lenses.
Most patients need several practice sessions before they feel confident handling their lenses at home. We encourage you to take your time, stay patient, and reach out if you have trouble, as mastering these skills is essential for safe and comfortable lens wear.
We recommend starting with just a few hours of wear on the first day and gradually increasing the time each day as your eyes adapt. This slow buildup helps your cornea and eyelids adjust to the sensation of the lens and reduces your risk of irritation or swelling.
- Begin with two to four hours on day one
- Add one to two hours each day if you feel comfortable
- Aim to reach a full day of wear within one to two weeks
- Remove the lenses immediately if you experience pain, redness, or vision changes
Specialty lenses require thorough cleaning each time you remove them to prevent protein buildup, bacteria, and debris from accumulating on the surface. We will recommend a specific cleaning solution designed for your lens material.
Rub the lens gently with solution in the palm of your hand, rinse it well, and then store it in fresh solution overnight. Never use tap water, saliva, or expired products, as these can introduce harmful microbes that cause serious eye infections.
Always store your lenses in a clean contact lens case filled with fresh disinfecting solution. Replace the solution every night, and never top off old solution with new.
- Rinse your lens case with solution and let it air dry each day
- Replace the case every one to three months to prevent contamination
- Keep the case in a clean, dry area away from the bathroom sink
- Never store lenses in water or saline that is not designed for disinfection
It is normal to feel aware of the lens on your eye during the first few days, along with mild tearing, light sensitivity, or a slight scratchy sensation that improves throughout the day. These feelings should gradually decrease as you adapt.
Contact our office right away if you develop sharp pain, sudden vision loss, increasing redness, discharge, or any symptom that does not improve when you remove the lens. These may be signs of infection, abrasion, or poor lens fit that requires immediate attention.
Follow-up Appointments and When to Seek Care
We typically schedule your first follow-up visit within one to two weeks after you receive your lenses, then again at one month, three months, and every six to twelve months thereafter. These appointments allow us to monitor your eye health, check the lens fit, and update your prescription if needed.
Regular visits are important because both your cornea and your lenses can change over time. We check for signs of corneal thinning, scarring, or progression and ensure your lenses continue to provide safe and effective vision correction.
If you notice that your vision is becoming blurry or unstable, your lenses are uncomfortable even after the initial adaptation period, or they are not staying centered on your eye, your fit may need adjustment. Lenses can warp, scratch, or develop deposits that affect performance.
- Your vision fluctuates throughout the day or after blinking
- The lens feels tighter or looser than it used to
- You see new glare, halos, or distortion that was not present before
- The lens frequently falls out or moves excessively
Remove your lenses and contact our office the same day if you experience sudden eye pain, a red or bloodshot eye, sensitivity to light that makes it hard to keep your eyes open, or any discharge or crusting. These symptoms may indicate an infection, scratch, or severe allergic reaction.
Do not resume wearing your lenses until we have examined you and cleared you to do so. Continuing to wear lenses when you have an eye problem can lead to serious complications, including vision-threatening ulcers or scarring.
Keratoconus can continue to progress over time, especially in younger patients, which may change the shape of your cornea and require a new lens design or parameters. We monitor progression with corneal mapping at each visit and update your lenses as needed.
If your keratoconus advances significantly despite specialty lens wear, we may discuss additional treatments such as corneal cross-linking to stabilize the cornea or, in rare cases, corneal transplant surgery. Specialty lenses often remain effective even after these interventions.
Frequently Asked Questions
From your first fitting appointment to receiving and adapting to your final lenses, the process typically takes four to eight weeks, though it can be shorter or longer depending on the complexity of your case and how quickly the lenses are manufactured. Some patients achieve a great fit quickly, while others need multiple trial lenses and adjustments before we find the perfect design.
Specialty lens fittings are more involved than standard contact lens exams, so the professional fees and lens costs are higher than regular contacts. Many vision insurance plans provide some coverage for medically necessary lenses like those used for keratoconus, and we can help you understand your benefits and explore financing options if needed.
Most specialty lenses for keratoconus are designed for daily wear and should be removed each night to allow your cornea to breathe and recover. Extended wear may be considered in specific cases with certain lens materials, but only under close supervision from our eye doctor, as overnight wear increases the risk of infections and corneal complications.
If your corneal shape continues to change, we will refit you with updated lens parameters or a different lens design to maintain clear and comfortable vision. Progression is most common in younger patients, and we often recommend corneal cross-linking to slow or halt further changes and protect your vision for the long term.
If you are unable to wear contact lenses due to severe discomfort, allergies, dexterity issues, or other barriers, we may discuss surgical options such as implantable contact lenses or corneal transplant procedures. Glasses may still provide functional vision for daily tasks in early-stage keratoconus, though they typically become less effective as the condition advances.
Getting Help for Specialty Lens Fitting Process for Keratoconus
Our eye doctor is here to guide you through every step of the specialty lens fitting process and help you achieve the clear, comfortable vision you need for daily life. If you have been diagnosed with keratoconus or are struggling with your current vision correction, we encourage you to schedule a specialty lens consultation to explore your options and begin the journey to better sight.