Keratoconus is an eye disease that affects the structure of the cornea. The shape of the cornea gradually over time changes from the ordinary round shape to a cone shape. The eye bulges out causing vision distortions and problems.

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


The initial symptom is subtle blurring of vision that cannot be corrected with glasses or contact lenses. (Vision can frequently be corrected to 20/20 with Scleral contact lenses.) Over time, patients may have eye halos, glare, or other night vision problems.

Most people who develop keratoconus have a history of being nearsighted. The nearsightedness tends to become worse over time. As the problem gets worse, astigmatism develops.


Contact lenses are the main treatment for most patients with keratoconus. However very specialized designs have been developed that improve vision and comfort far beyond yesterday’s lenses. In addition, customized soft lenses, hybrid, and scleral lenses can now be designed that can also provide excellent visual results in many cases of keratoconus.

The last remedy for keratoconus to be considered may be a corneal transplant, also called a penetrating keratoplasty (PK or PKP). Even after a transplant, you most likely will need glasses or contact lenses for clear vision. For many years, the only surgical treatment was corneal transplantation.

Precision Vision Rehabilitation (PVR) PROSE Treatment For Keratoconus

Corneal specialists agree that it is best to exhaust all non-surgical options, for Keratoconus, before undergoing corneal transplant surgery, especially for younger patients.

PVR PROSE Treatment uses prosthetic lenses that are large-diameter gas permeable contact lenses, specially designed to vault over the entire corneal surface and rest on the “white” of the eye. In doing so, PVR PROSE Lenses functionally replace the irregular cornea with a perfectly smooth optical surface to correct vision problems caused by Keratoconus, Lasik failures, post-surgical complications, and other corneal irregularities.

PVR PROSE Lenses are designed to vault the corneal surface and rest on the less sensitive surface of the sclera, these lenses often are more comfortable for a person with corneal irregularities, like keratoconus. A special liquid fills the space between the back surface of the lens and the front surface of the cornea. This liquid acts as a buffer and protects the compromised corneal tissue. CornealCorretion PROSE Lenses are custom designed to fit with little or no lens movement during blinks, making them more stable on the eye, compared with traditional corneal gas permeable lenses. CornealCorretion PROSE Lenses are almost always very comfortable and the vision provided by them is extremely good. The great majority of patients are able to wear their PVR PROSE lenses almost all of their waking hours without problems.

With the PVR PROSE Treatment, Global Contact Lens Specialists has the experience, knowledge, and technology to offer a precise-fitting process to create a new ocular surface, with the a proper fit, and great vision. Dr. Irwin Azman prescribes PVR PROSE Lenses for a variety of hard-to-fit eyes, including patients with Stevens-Johnson Syndrome, Radial Keratotomy RK and LASIK Complications, Keratoconus, Corneal Ectasia, Post-Surgical Vision Loss, and Pellucid Marginal Degeneration. Dr. Irwin Azman neither avoids nor declines the challenge of prescribing the most difficult cases. Dr. Azman tends to have a perfectionist demeanor.

Contact Global Contact Lens Specialists Today to Learn More About
Precision Vision Rehabilitation (PVR) PROSE Treatment.