Conditions PROSE Treats

Keratoconus and Corneal Ectasia

 "Thanks to PROSE treatment, I was able to put off cornea transplant surgery, which, at the age of 41 when I got my treatment, was a true blessing from God."

86% of patients with keratoconus or ectasia reported significant success with BostonSight® PROSE treatment.

Contact us today to find out if we can help you!

Read our guide here: Keratoconus and Corneal Ectasia: BostonSight PROSE Treatment Can Help

"I had intacs and PROSE treatment. Between the two I would do PROSE hundreds of times over!"
— Amber H., keratoconus patient, July 2012

About Corneal Dystrophies and Ectasia

PROSE treatment can improve vision and alleviate symptoms in patients with corneal dystrophies and ectasia. Corneal ectasia is an umbrella term for a group of conditions that cause a progressive thinning and distortion of the corneal shape, including:

• Keratoconus
• Keratoglobus
• Pellucid marginal degeneration
• Terrien’s marginal degeneration
• Post-LASIK, post-RK (radial keratotomy), post-PRK
  (penetrating keratoplasty)
• Post-cornea transplant

Together, keratoconus and post-refractive ectasia are the second most frequent indication for corneal transplantation, accounting for about 15% of the corneal transplants performed in the US. 

Patients with intolerance to contact lenses, corneal scarring or pain, and/or recurrent corneal erosions due to poor fitting contact lenses are often good candidates for PROSE treatment.

To learn more about keratoconus in general, please visit the National Keratoconus Foundation website at

How BostonSight PROSE Treatment Can Help

Thousands of patients with keratoconus, corneal dystrophies and ectasia - just like you - have had their vision restored and quality of life transformed with our innovative treatment: PROSE. BostonSight PROSE (prosthetic replacement of the ocular surface ecosystem) treatment uses FDA-approved custom made prosthetic devices to replace or support impaired ocular surface system functions that protect and enable vision.

The prosthetic devices created during PROSE are transparent domes, about the size of a nickel. They look similar to an oversized hard contact lens and resemble a margarita glass without the stem in shape. PROSE devices fit under the eyelids, vaulting the damaged cornea and resting on the sclera (the relatively insensitive white tissue of the eye). Worn during waking hours, patients are trained in daily application, removal and cleaning as part of the treatment process.

PROSE devices are made out of a highly gas-permeable hard plastic that allows oxygen to reach the cornea. They are designed to create a space between the prosthetic device and the eye that is filled with sterile saline. The liquid remains in the reservoir, providing constant lubrication by bathing the eye in a pool of artificial tears.

Benefits of BostonSight PROSE 

  • Reduces symptoms and supports healing by restoring a healthy ocular surface environment
  • Improves blurry vision by masking irregularities on the cornea’s surface and transmitting a sharp image to the back of the eye
  • Prevents further damage by protecting and shielding the cornea against the environment  and eyelids

Note: The prosthetic devices used in PROSE were formerly known as Boston Ocular Surface Prosthesis (BOS-P), Boston Scleral Lens devices and Boston Scleral Lens Prosthetic Devices.  

Updated 9/15

Seeing is Believing

Harry Daniels


Severe complications from keratoconus and related corneal contact lens issues had left Harry Daniels barely able to read and in danger of not passing the vision test to renew his driver’s license. His quality of life — and his law career — were in serious more.

Keratoconus Symptoms and Treatment Success

A 2010 BostonSight survey of 200 people with keratoconus and other corneal dystrophies and degenerations (121 PROSE patients) found that:

  • 77% had difficulty reading regular print newspapers, magazines or websites
  • 73% had difficulty with work or hobbies that require seeing up close
  • 69% had moderate or severe light sensitivity
  • 78% had difficulty driving at night
  • 59% had eye pain

When asked about their success with various treatments:

  • 1% had significant success with soft contact lenses
  • 7% with hybrid contact lenses
  • 22% with rigid gas-permeable (RGP) contact lenses
  • 45% with scleral lenses (not BOS-P or Boston Scleral Lens used in BostonSight PROSE)

86% had significant success with BostonSight® PROSE treatment*

* Survey questions refer to success with Boston Ocular Surface Prosthesis (BOS-P) and Boston Scleral Lenses used exculsively in BostonSight PROSE treatment.

Read more patient survey results in our Report Back to the Community.

A Changed World

“Dr. Patel said I would be able to wear just prosthetic devices, without glasses, and I would be able to drive. And he said I wouldn’t be in pain anymore.” And to her amazement, he was more