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Practical, sourced references for optometrists and ophthalmologists considering a scleral lens referral: who benefits, when to refer, what to send, and what to expect back.
When to refer for scleral lenses Refer when spectacles and conventional contact lenses no longer give functional vision on an irregular cornea, or when ocular surface disease persists despite first- and second-line therapy. Corneal irregularity accounts for most scleral lens fits. A scleral lens corrects optics and protects the surface; it does not treat ectatic progression, so a progressing cornea needs a cross-linking evaluation as well. Updated October 2, 2026 Scleral lens candidate criteria The strongest predictor of success is a clear visual or therapeutic need, typically an irregular cornea, that the lens meets. The most common reason for stopping is difficulty with insertion and removal. Neurologic comorbidity, poorer vision gain, and ocular surface disease as the indication have each been associated with lower continuation. Few of these are reasons not to refer; most are reasons to flag the issue so the fitter can plan training, devices, or caregiver help. Updated October 2, 2026 Scleral lens referral checklist Send the reason for referral and the goal, serial topography or tomography, a current refraction with BCVA, the contact lens history and why each lens failed, surgical reports (especially keratoplasty and glaucoma surgery), current medications with their preservatives, and relevant systemic history. Graft patients should come with whatever endothelial and pachymetry data exist. Fitting typically takes several visits, so set that expectation with the patient. Updated October 2, 2026 Co-managing scleral lens patients The fitter manages the lens: fit, surface response, care regimen, and handling. You continue to manage the underlying disease and everything else in the eye. At your visits, examine the cornea and conjunctiva after lens removal, check acuity in the lens, and measure IOP with the lens out. Average IOP measured after removal has not changed in pooled studies, but pressure during wear is harder to measure and remains an open question for glaucoma and at-risk patients. Updated October 2, 2026 What the fitter sends back A complete report gives the final lens parameters and material, acuity in the lens, how the lens sits on the eye (central and limbal clearance, landing zone, any blanching or impingement), the corneal and conjunctival findings after wear, the care products and wear schedule, the follow-up plan, and anything the fitter needs you to act on. Expect an initial note after the evaluation and a final report once the fit is complete. Updated October 2, 2026 Scleral lenses for ocular surface disease referrals Scleral lenses protect the ocular surface by holding a reservoir of non-preserved saline against the cornea and shielding it from lid shear and evaporation. They are a step 3 therapy in TFOS DEWS II, generally used after lubricants, anti-inflammatory therapy, and punctal occlusion, and often alongside them. Outcome data are strongest for exposure, neurotrophic keratopathy, and ocular GVHD, and weaker for dry eye without corneal involvement. Continuation is lower than in irregular cornea, so set expectations. Updated October 2, 2026 Scleral lens complications to watch for Most scleral lens problems are lens-related rather than physiological: broken lenses, deposits, poor wetting, and midday fogging. Physiological complications are less common and include conjunctival changes at the landing zone, corneal edema (higher risk in grafts), hydrops in keratoconus, and, rarely, microbial keratitis. Infection, rejection, and acute hydrops need same-day care; fit-related findings go back to the fitter. Updated October 2, 2026 Pediatric scleral lens referrals Children can be fit with scleral lenses, and published series report durable visual gains. In pediatric keratoconus the first priority is progression: it is often more advanced at diagnosis and progresses faster in children, and cross-linking reduced progression in a randomized trial of 10- to 16-year-olds. Refer for CXL evaluation and lenses in parallel. Most published pediatric scleral lens fits are for ocular surface disease, such as Stevens-Johnson syndrome, neurotrophic keratopathy, and exposure. Caregiver involvement is central. Updated October 2, 2026 Sample scleral lens referral letter A good referral letter states the question, the diagnosis, current refraction and acuity, tomography and cross-linking status, the lens history, relevant surgery, medications, and anything that affects handling or infection risk. It also says who manages what afterward and how you want reports sent. The template below covers each of these in about one page. Updated October 2, 2026 Managing midday fogging in scleral lens wearers Midday fogging is debris accumulating in the post-lens fluid reservoir, and it is common: a quarter to over half of wearers report it, depending on the study. No single lens parameter or care product explains it; the most consistent associations are with signs of ocular surface inflammation, front-surface nonwetting, and dry eye symptoms. Management is stepwise and mostly supported by small studies: treat lid and surface disease, confirm the filling solution, consider a different filling solution, and refit to change tear exchange or landing zone alignment. Updated October 2, 2026 Monitoring corneal edema in scleral lens wearers In healthy corneas, modern high-Dk scleral lenses worn open-eye cause small swelling, roughly 1 to 2% in short-term studies, that resolves after removal. The concern is eyes with reduced endothelial reserve: penetrating keratoplasty grafts, Fuchs dystrophy, and other low cell counts, where swelling is larger, more variable, and has ended treatment in some patients. Measure pachymetry with the same device before wear and immediately after removal, and send any rise or new clinical edema back to the fitter, and to the surgeon for a graft. Updated October 2, 2026 Scleral lenses in glaucoma patients IOP measured after lens removal is essentially unchanged in most studies, but that number does not describe pressure during wear. Indirect measurements during wear show rises from about 1 to 5 mmHg in healthy eyes, with small reversible optic nerve changes, and there are no long-term outcome data in glaucoma. For patients with glaucoma or ocular hypertension, rely on structural and functional monitoring, coordinate with the fitter on landing zone design, and expect blebs and anterior tubes to need customized lenses. Updated October 2, 2026 Conjunctival prolapse and scleral lenses Conjunctival prolapse is limbal or perilimbal conjunctiva drawn into the space under a scleral lens. It is common: in an OCT study of 10 healthy adults, 8 showed it at least once during 90 minutes of wear, most often nasally, and its height tracked how far the lens settled at the limbus. Reviews describe it as usually benign but capable of causing discomfort or, if extensive, blocking vision. It is a fit issue to send back to the fitter, who may change the edge, landing zone, or limbal clearance. Updated October 2, 2026 Limbal and conjunctival findings in scleral lens wearers A scleral lens bears on the conjunctiva, so some landing zone change is expected: a faint impression ring after removal usually fades within hours. Sectoral or circumferential blanching during wear with rebound hyperemia after removal, edge impingement, quadrant staining, or limbal staining point to a fit problem that the fitter can usually correct with design changes. Imaging studies show measurable conjunctival vascular and thickness changes under the landing zone, of uncertain long-term significance. Limbal compromise in eyes with limbal stem cell deficiency needs closer attention. Updated October 2, 2026 Scleral lenses and corneal neovascularization New corneal vessels in a scleral wearer usually point to hypoxia, limbal bearing, or a tight landing zone, or to the underlying disease. A practitioner survey estimated that 0.53% of wearers stopped lens wear in a year because of neovascularization, so it is uncommon but real. Document vessels at baseline, report new or advancing vessels to the fitter promptly, and treat inflammation. In severe surface disease, small case series report regression of existing vessels with PROSE, including when used to deliver topical bevacizumab. Updated October 2, 2026 Corneal cross-linking and scleral lens timing There is no trial-based standard for when to resume scleral lens wear after cross-linking. Epithelial healing comes first. After that, the US trial data show Kmax and acuity worsening at 1 month, improving through 6 months, and stabilizing thereafter, with haze peaking at 1 month. Small studies suggest a lens fitted before CXL often still fits at 1 to 3 months, and that lenses prescribed months after CXL perform well over the following year. The surgeon decides when lens wear may resume; the fitter decides whether a refit is needed. Updated October 2, 2026 Managing scleral lens wearers with neurotrophic keratitis Scleral lenses can protect the neurotrophic cornea, heal persistent epithelial defects, and improve vision, but the evidence is case reports and small series, with no randomized trials. The main risk is infection that the patient can't feel: reduced corneal sensation blunts the pain that normally prompts a visit. Continuous wear for active defects has been used under close supervision, sometimes with a non-preserved antibiotic in the reservoir, and transitions to daily wear once healed. Schedule exams rather than relying on symptoms, and coordinate any topical NGF therapy, which requires lens removal before each dose. Updated October 2, 2026