BostonSight SCLERAL: We Fit the 18mm Class Locally
BostonSight SCLERAL offers the widest diameter range of any scleral lens — 14.5 to 19mm. We fit the 18mm class in our office for keratoconus and ocular surface disease, delivering the same fluid reservoir and corneal protection as PROSE without travel or PROSE-level cost.
Medically Reviewed by Dr. Alexander Bonakdar, O.D.
What Is BostonSight SCLERAL?
BostonSight SCLERAL is a large-diameter gas-permeable scleral lens designed by BostonSight — the same organization that created the PROSE prosthetic device. It is available in diameters from 14.5 to 19mm, making it the most versatile scleral platform on the market.
Unlike PROSE, which is custom-manufactured at BostonSight facilities, BostonSight SCLERAL is fitted by trained specialists in their own offices using profilometry-guided design. This means local care, faster turnaround, and significantly lower cost.
For most keratoconus and OSD patients, the 18mm class provides maximum fluid volume and corneal clearance. The marginal benefit of increasing from 18mm to a 19mm PROSE device is minimal — most patients achieve equivalent outcomes with BostonSight SCLERAL at a fraction of the cost.
BostonSight SCLERAL vs PROSE
Why We Fit the 18mm Class
BostonSight SCLERAL comes in a range of diameters. We typically fit the 18mm class for patients who need large-diameter scleral coverage — particularly ocular surface disease, severe keratoconus, and post-keratoplasty cases.
Maximum Fluid Reservoir
The 18mm diameter holds substantially more saline than standard 15.5–16mm sclerals — providing hours of continuous corneal hydration for severe dry eye patients.
Full Corneal Vault
The larger diameter clears the entire cornea with room to spare — even in advanced keratoconus with steep, protruding cones that smaller designs struggle to vault.
Stable Scleral Landing
The wider landing zone distributes bearing pressure over more scleral tissue, reducing focal compression and improving all-day comfort.
For standard keratoconus without OSD, a 15.5–17mm design (Zenlens, Onefit, Jupiter) is typically sufficient. We reserve BostonSight SCLERAL 18mm for cases where the extra diameter provides a measurable clinical advantage.
Need Large-Diameter Scleral Lens Care?
We fit BostonSight SCLERAL locally in Santa Ana — no travel to a PROSE center required.
When BostonSight SCLERAL Is the Right Choice
Ocular GVHD
Maximum fluid reservoir replaces destroyed lacrimal function. The 18mm class provides continuous hydration that smaller sclerals cannot match.
Stevens-Johnson Syndrome / TEN
Large diameter protects the cornea from lid scarring and symblepharon. The rigid dome acts as a mechanical barrier over compromised tissue.
Advanced keratoconus
Steep, protruding cones that approach or exceed the vault capacity of 15.5–16mm designs. The 18mm provides clearance without excessive edge lift.
Post-keratoplasty
Irregular post-graft surfaces with significant corneal-scleral junction asymmetry. The wider landing zone accommodates graft-host junctions that smaller lenses bridge.
Neurotrophic keratitis
Full corneal protection for insensate corneas at risk of epithelial breakdown. The sealed fluid environment promotes healing.
See also: scleral lenses for OSD · scleral lens brand comparison · PROSE vs scleral lenses
Is BostonSight SCLERAL Right for You?
Tell us about your condition and we'll determine whether a large-diameter BostonSight SCLERAL — or a standard scleral design — is the best fit for your eyes.
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Insurance Plans We Accept
We work with most major vision and medical insurance providers to maximize your benefits.
Vision Plans
- VSP (Vision Service Plan)
- EyeMed
- Davis Vision
- Spectera
- Superior Vision
- Avesis
Medical Plans
- Medicare
- Blue Shield of California
- Anthem Blue Cross
- United Healthcare
- Cigna
- Aetna
- Tricare
*Medical insurance is often used for medically necessary contact lenses.
CareCredit Financing
Make keratoconus treatment affordable with CareCredit. We offer 0% interest financing for 6- and 12-month plans on scleral lens fittings and other treatments. Apply in minutes — no impact to your credit score to check eligibility.
Lost or Broken Scleral Lens? Same-Day Help Available
Emergency scleral lens dispensing for keratoconus patients
If your scleral lens is lost, cracked, or damaged, you may be functionally unable to see. We understand the urgency. Dr. Alexander Bonakdar keeps diagnostic and loaner scleral lenses on-site and can often restore functional vision the same day while your custom replacement is being fabricated.
Emergency Scleral Lens Pricing
- $250 flat fee + insurance (during office hours)
- $500 flat fee + insurance (after-hours care)
If your lens is cracked but still wearable, stop wearing it — a damaged edge can scratch the cornea and turn a lens replacement into a corneal injury.
Call Now: (949) 693-4900