The short version. Keratoconus is a progressive thinning of the cornea that distorts vision and can no longer be corrected with regular glasses or soft lenses after a certain stage. In 2026 there are five well-established non-surgical paths to clear vision: aspheric freeform glasses (for very early cases), rigid gas-permeable (RGP) lenses, hybrid lenses, custom toric soft lenses for the milder edge of the disease, and scleral lenses for moderate-to-advanced cases. At Vision Experts in Amman we fit all five and rarely need to refer for surgery in the first year — most patients reach functional vision in 2–3 fittings. This guide walks through what each option does, when it is appropriate, and what to realistically expect at the chair.
What keratoconus actually is
Keratoconus is a corneal ectasia — the cornea thins and bulges outward into a cone-like shape. The result is irregular astigmatism that glasses cannot fully correct because the optical surface is no longer regularly curved. The condition typically appears in the late teens or twenties, can progress for 10–20 years, and then usually stabilizes. The classic patient is a young adult who needs new glasses every six months and still cannot read the bottom row of the chart.
It is not rare. The most cited epidemiological data puts global prevalence at roughly 1 in 2,000, but Middle-East studies — including data from Iran, Saudi Arabia and Egypt — consistently show rates 3–10× higher in our region, possibly because of a combination of genetics, eye rubbing in allergic conjunctivitis, and intense sun exposure during the developmental years. In our practice we see new keratoconus cases nearly every week.
Why surgery is rarely the first stop
Most patients land in an optometry chair before any surgeon has been involved. There is good reason for that. Corneal cross-linking (CXL) is a useful intervention to halt progression — it does not improve vision. Intracorneal ring segments and corneal transplant are reserved for advanced cases where contact-lens fitting has been exhausted. In 2026 the rational starting point for nearly every patient is a properly fit contact lens, and surgery becomes a question only when the contact-lens path runs out.
The American Academy of Ophthalmology’s Preferred Practice Pattern on Corneal Ectasia reflects the same sequencing: “In most patients, contact lenses provide adequate visual rehabilitation.”
The five non-surgical paths
1. Aspheric freeform glasses (early cases only)
If the cornea is only slightly irregular, modern aspheric freeform lenses with optimized progressive design can recover most of the visual quality that ordinary glasses lose. The freeform manufacturing tolerances (modern equipment cuts surfaces to about 1 micron of accuracy) mean we can build a lens that compensates for the patient’s specific higher-order aberration profile. This works in a narrow window: early forme-fruste keratoconus and some pellucid marginal degeneration cases. Once the cone reaches even moderate severity, glass-based correction stops being competitive with contact lenses.
2. Custom toric soft lenses (mild irregularity)
The same logic applies one step further. A high-modulus custom soft lens with stable rotational axis can correct mild keratoconus, especially in patients who cannot tolerate rigid lenses. The fitting set runs into dozens of trial parameters, but for the right patient — typically someone in their early twenties with mild ectasia and a strong preference for soft lens comfort — it works.
3. Rigid gas-permeable (RGP) lenses
For most of the last forty years RGP lenses were the standard. A small, high-Dk-permeability rigid lens sits on the cornea and replaces the irregular front surface with its own regular surface. The tear film between lens and cornea fills the irregularities. Vision is excellent — often 20/20 — but the lens is small enough that the cone apex is in direct contact, which can cause apical scarring over time. RGP remains the right choice for many mild-to-moderate keratoconus cases, especially in patients who already wear them and tolerate them well. Newer aspheric, multi-curve and reverse-geometry RGP designs have made the fit much more refined than the spherical-front lenses of the past.
4. Hybrid lenses
A hybrid is an RGP centre fused to a soft skirt. The patient gets the optical quality of the rigid centre with the comfort of a soft outer ring. SynergEyes (the dominant manufacturer) makes specific keratoconus designs (UltraHealth, ClearKone). Fitting is more demanding than soft lenses but easier than scleral. For patients who do not tolerate full-RGP comfort but need better optics than custom soft, hybrid is often the answer.
5. Scleral lenses (the answer for moderate-to-advanced cases)
Scleral lenses are large-diameter rigid lenses (typically 15–22 mm) that vault entirely over the cornea and land on the white of the eye (the conjunctiva over the sclera). The space under the lens is filled with preservative-free saline. The cornea never touches the lens. Vision is excellent because the rigid front surface is regularly curved; comfort is excellent because nothing rubs the sensitive cornea; and the saline reservoir creates a constant moisture bath that helps the dry-eye component most keratoconus patients also carry.
For moderate-to-advanced keratoconus, scleral lenses are the modern standard. The Scleral Lens Education Society has published consensus fitting protocols and clinical evidence is now extensive — wear times of 12+ hours are routine, and a properly fit scleral lens can recover near-perfect visual acuity in eyes that would have been transplant candidates a decade earlier.
The fitting is more demanding than for any other lens type. Our clinic uses a fitting set of approximately 60 scleral lens parameters and a Scheimpflug Tomographer (TMS-5) to map the corneal and scleral elevation. Most patients reach a stable fit in 2–3 visits; complex cases (post-graft corneas, severe asymmetry between eyes, scleral asymmetry from previous filtering surgery) may take 4–6.
How we sequence the fit at Vision Experts
The decision tree for a new keratoconus patient walking into our clinic is roughly this:
- Comprehensive measurement. Refraction, slit-lamp exam, Scheimpflug tomography (TMS-5) for elevation maps, anterior-segment OCT where appropriate. Severity is staged by maximum keratometry (K-max), thinnest pachymetry, and visual acuity with best correction.
- Patient priorities. Wearing time, profession, hobbies, allergic-conjunctivitis history, dry-eye symptoms, and tolerance for handling devices all matter. A pilot who needs 14-hour wear time has a different optimal lens than a student who reads for 6 hours and prefers to wear glasses on weekends.
- Trial fit. We start with the least-invasive option that is likely to work — soft → hybrid → RGP → scleral. We do not over-fit. Scleral lenses are not the default for every keratoconus patient.
- Follow-up over the first 60 days. Final tweaks happen here. Most lenses need 1–2 parameter adjustments after the trial fitting.
- Annual review. Keratoconus progresses. We re-measure, re-fit if needed, and check for any sign that the patient should now also see a corneal surgeon for cross-linking.
When to add cross-linking to the picture
Corneal cross-linking does not improve vision; it stops progression. If you have demonstrable progression on tomography (a K-max increase of ≥1 D over 6–12 months, for instance, or a thinning of ≥10 microns), CXL is worth considering — typically before age 35 when the cornea is still actively evolving. After 35, most corneas have stabilized and CXL adds less value. We routinely co-manage with corneal surgeons in Amman and refer when the criteria are met.
What it costs and how long it takes
Costs vary widely depending on the lens type. For scleral lens fitting at Vision Experts, the all-in fee covers the workup, the fitting visits, the lens(es) themselves, and the early follow-ups. Most patients are seeing well by visit 3. The lenses themselves typically last 18–24 months before replacement; some specialty designs last longer. We don’t post prices on the public site because the fitting complexity varies — a phone call or an in-person consultation gets you a concrete number for your specific case.
Frequently asked questions
Can keratoconus be cured?
No, not in the sense of restoring the cornea to a perfectly regular shape. But the visual consequences of keratoconus are almost always fully correctable — most patients reach 20/20 or near-20/20 with the right lens. Cross-linking can halt the progression, and lenses recover the vision.
Do I need surgery if I have keratoconus?
Most patients do not. The current standard of care is to start with contact lenses, add cross-linking if progression is documented, and reserve corneal ring segments or transplant for the small subset of cases where lens fitting can no longer give functional vision. We see roughly one transplant referral per 50 new keratoconus patients in our practice.
How long does scleral lens fitting take?
The first appointment is approximately 90 minutes. Most patients have a working lens by the third visit, with the entire fitting process completed inside 4–6 weeks. Complex post-surgical cases can take longer.
Can I wear scleral lenses overnight?
No. Scleral lenses are daily-wear only. Sleeping in them is contraindicated. We dispense each pair with explicit handling, cleaning and storage protocols.
Is keratoconus hereditary?
It runs in families more often than chance would predict. If a parent or sibling has keratoconus, you should have a baseline corneal tomography (not just a regular eye exam) at some point in your teens or twenties even if your vision feels normal. Early detection means earlier cross-linking if you turn out to be progressing.
I rub my eyes a lot. Is that a problem?
Yes — vigorous eye rubbing is one of the strongest non-genetic risk factors for progression. Treating any underlying allergic conjunctivitis (which is what drives most chronic rubbing) is a routine part of our keratoconus protocol.
Are scleral lenses safe?
When properly fit and properly cared for, yes. The main complications — corneal hypoxia from a too-tight fit, microbial infection from contaminated saline, and conjunctival impingement from a too-large diameter — are managed by fitting quality and patient education. We follow the Scleral Lens Education Society care guidelines and our complication rate is consistent with the published literature.
Will my insurance cover it?
In Jordan, private health insurance coverage of specialty contact lens fitting for keratoconus varies by carrier and policy. We provide an itemized invoice that some carriers will reimburse against a “medically necessary contact lens” benefit. Worth calling your provider before scheduling.
What to do next
If you have been told you have keratoconus, or your glasses prescription is changing more often than once a year, or you have a relative with the disease, the first step is a proper corneal exam — not just a refraction. We do this at Vision Experts using a Scheimpflug Tomographer (TMS-5) which gives a posterior corneal map that a standard topographer cannot. The exam takes about 45 minutes and is the basis for every fitting decision afterward.
You can book an appointment online, send an email to info@visionexperts.net, or call +962 6 566 6122 or WhatsApp +962 77 566 6122. We see patients from across Jordan and from neighbouring countries — many of our scleral-lens fittings come from the GCC.
If you want to read more about specific lens types before your visit, our keratoconus services page covers the operational details and our scleral lens page goes into the fitting protocol.
Bilal Rawashdeh is the founder and lead clinician at Vision Experts in Amman, Jordan. He is an Optometrist and Contact Lens Specialist with 20+ years of experience fitting specialty contact lenses for keratoconus and irregular corneas. This article is for general information and does not substitute for an in-person clinical assessment.