What a scleral lens fitting involves

Why it’s a process, not an appointment

A scleral lens is custom-designed for one eye. It has to land evenly on the white of the eye, clear the cornea by the right amount everywhere, and give you the right prescription. That takes measurement, a trial or a design, and usually some adjustment once you’ve worn the lens.

In an international survey of 259 scleral lens patients, the fitting process took an average of 3.8 visits (ranging from 1 to 18) and 2.4 lenses ordered (ranging from 1 to 16).^[1] In a case series of people with eye surface disease, the average was 3 visits and 1.4 lenses per eye.^[4] Your number may be higher or lower. Needing more than one lens doesn’t mean something went wrong.

Step by step

1. The first visit: history, health, and measurements

The first appointment is mostly about collecting information and deciding whether scleral lenses are the right next step for you.

• Your history. What you’ve tried, what worked, what didn’t, and what you need your vision for. Bring copies of past prescriptions, surgical reports, and diagnoses from other eye doctors.
• Vision. How well you see now with your current correction.
• Eye health. A microscope exam of the lids, tear film, and the front of the eye.
• Mapping the eye. Imaging of the cornea’s shape. Practices use different tools: some map the surface of the cornea, some produce a 3D model of it, and some also scan the shape of the white of the eye where the lens will land.

In a survey of 423 fitters who fit scleral lenses for keratoconus, the median time for the initial evaluation was 30 minutes, whatever fitting method they used.^[2] Your appointment may be longer than that once history, eye health, and teaching are included.

2. Fitting or designing the lens

There are three main ways fitters arrive at a lens design:

• Trial (diagnostic) lenses. The fitter places a lens from a set onto your eye, filled with saline, and looks at how it sits. They check the clearance over the cornea, where the edge lands, and how you see through it. This is still the most common approach. In a survey of fitters, most reported using trial lenses for most of their keratoconus fits, even when they had scanning equipment.^[3]
• Scan-based design. A detailed scan of the front of the eye is used to design the lens, sometimes without trial lenses.
• Impression-based design. A soft molding material is placed briefly on the eye to make a 3D cast, and the lens is made from that mold.

Each method has its place. In the survey of fitters, there was no difference in the median initial evaluation time or the median number of lenses ordered (2) between the three methods.^[2] Scans were adequate to order a first lens about 80% of the time, and impressions about 90% of the time, as a median across fitters.^[2]

During the trial, be honest. Tell your fitter about comfort, vision, and how much you feel the lens edge. “It’s fine” when it isn’t makes the next lens harder to get right.

3. Ordering the lenses

Your fitter sends the design to a specialty lab, which makes the lenses to order. This is when the clock starts on the wait. Ask how long your practice’s lab usually takes and whether the fitting fee includes remakes if the first lenses need changes.

4. The dispensing visit: learning to handle them

When your lenses arrive, your fitter checks them on your eyes and then teaches you to put them in, take them out, and clean them. Plan for this to take a while. In a one-year study of 95 new scleral wearers, 36% could put a lens in correctly in under 15 minutes at this visit, while 13% needed more than an hour.^[5] Over the following months, wearers needed fewer attempts and wore their lenses longer each day.^[5]

You’ll usually leave with a care routine, a supply of sterile saline, and instructions for building up wearing time. Our guides on how to insert and how to remove scleral lenses walk through the technique.

5. Follow-up and fine-tuning

Follow-up visits are where the fit gets refined. Your fitter looks at the lens after you’ve worn it for some hours, because the lens settles onto the eye during the day. They check how much clearance is left over the cornea, whether the edge is pressing or lifting, how you see, and how your eye looks after wear.

Adjustments are common. In a study of 157 keratoconic eyes wearing scleral lenses, refits made up 54.0% of the interventions fitters made over the follow-up period.^[6] Regular check-ups continue after the fit is final. A 2026 case series on complications from poorly fitted scleral lenses stresses that fit and the underlying condition should be checked at regular intervals in all wearers.^[7]

Where the process falls short

• It takes time. Several visits over a number of weeks is typical, and complex eyes can take longer.
• It can be frustrating. Some lenses need to be remade more than once.
• The handling learning curve is real. Difficulty putting lenses in and taking them out is the most common reason people stop.^[5]
• Fees and what they cover vary widely. Ask for the fitting fee, what it includes, and the remake policy in writing before you start.

How to get the most out of your fitting

• Bring your records and a list of everything you’ve tried.
• Write down what you want to see well, and what bothers you most now.
• Give honest feedback during trials.
• Practice handling at home, and come back with questions.
• Keep your follow-up appointments, even when things feel fine.

Before you book, see questions to ask a scleral lens fitter.