Keratoconus Expert Worldwide: Dr. Gulani’s Published Surgical Algorithm
Keratoconus Expert: A Published Surgical Algorithm for Advanced, Extreme & Failed Keratoconus Treatment
Beyond Cross-Linking, INTACS, CAIRS and Corneal Transplantation: Customized Vision Rehabilitation for Keratoconus and Failed Keratoconus Surgery
When patients search online for a keratoconus expert, keratoconus specialist, keratoconus doctor, keratoconus surgeon, advanced keratoconus treatment, extreme keratoconus treatment, failed keratoconus surgery, failed cross-linking, INTACS complications, CAIRS complications, or a keratoconus second opinion, they are usually searching for much more than the name of another procedure. They are searching for vision. Some patients have newly diagnosed keratoconus, while others have lived with distorted vision and specialty contact lenses for decades. Some have already undergone corneal cross-linking but still cannot see clearly. Others have undergone INTACS, KeraRings, Ferrara Rings, CAIRS, CTAK, laser procedures or corneal surgery and remain visually disabled. Still others have extraordinarily steep or thin corneas, severe irregular astigmatism, corneal scars, post-LASIK ectasia, previous surgical complications or have already been told that a corneal transplant is their only remaining option.
For more than three decades, Dr. Arun C. Gulani, Founding Director and Chief Surgeon of Gulani Vision Institute in Jacksonville, Florida, has approached keratoconus differently. Rather than beginning with a procedure, he begins with the patient’s vision. His philosophy recognizes that two patients can both carry the diagnosis of keratoconus while having completely different corneal shapes, thicknesses, cone locations, scars, refractive errors, previous surgeries and visual goals. Therefore, the diagnosis alone should never dictate the procedure. The individual eye must dictate the plan.
This philosophy has evolved beyond decades of clinical experience into a peer-reviewed, published keratoconus surgical algorithm. In 2024, Dr. Gulani and co-authors published “Innovative Keratoconus Surgical Algorithm: A Refractive Approach to Restoring Vision” in the Indian Journal of Cataract and Refractive Surgery. The publication presents an algorithmic approach to keratoconus across disease severity, emphasizing visual rehabilitation and positioning corneal transplantation as a last resort when appropriate alternatives remain. This distinction is important because much of conventional keratoconus discussion revolves around controlling the disease, whereas patients ultimately experience keratoconus through its effect on their vision.
Keratoconus Is the Diagnosis. Vision Is the Goal.
Keratoconus is a corneal disorder in which the normally smooth cornea progressively thins and becomes irregular and cone-shaped. Since the cornea provides much of the focusing power of the eye, this abnormal geometry can produce nearsightedness, astigmatism, irregular astigmatism and higher-order optical aberrations. Patients may experience blurred vision, ghost images, multiple images, glare, halos, starbursts, poor night vision and continuously changing prescriptions. As the disease advances, ordinary glasses may no longer adequately correct vision, and patients frequently become dependent upon rigid gas-permeable or scleral contact lenses.
But keratoconus exists across an enormous spectrum. A mildly irregular cornea and an extremely steep, thin and scarred cornea should not automatically receive the same treatment simply because both are labeled “keratoconus.” The broader ectasia spectrum can also include keratoglobus, pellucid marginal degeneration and surgically induced corneal ectasia, including post-LASIK ectasia and complex irregular corneas following previous refractive procedures. The challenge is therefore not simply diagnosing keratoconus. The challenge is determining precisely what is preventing that individual eye from seeing and whether the problem is primarily visual, structural or a combination of both.
The Published Gulani Keratoconus Algorithm: Visual Versus Structural
The Gulani Keratoconus Algorithm begins with an important distinction between Visual and Structural problems. If an eye retains useful visual potential and adequate structural characteristics, it may be considered within the Visual pathway, where the objective is to determine whether its optical abnormalities can be safely rehabilitated. Depending upon the individual eye, this can involve refractive strategies including LaZrPlastique®, phakic lens technologies such as ICL, or lens-based techniques when appropriate. Conversely, when a keratoconus cornea is structurally compromised, the anatomy may need to be rehabilitated first. The Structural pathway can involve cross-linking, intracorneal technologies such as INTACS, KeraRings or Ferrara Rings, tissue-addition approaches such as CAIRS or CTAK, and different levels of lamellar or penetrating keratoplasty when necessary.
This creates a very different way of thinking about keratoconus surgery. Cross-linking, INTACS, CAIRS, CTAK, ICL, laser techniques and corneal transplantation are not competing procedures. They are potential tools that address different components of the same optical and structural problem. Dr. Gulani describes this throughout his refractive and corneal work as the “Ingredient versus Recipe” principle. Having an ingredient does not create the recipe. The expertise lies in deciding which ingredient belongs in which eye, in what magnitude, at what location and, importantly, in what sequence.
Cross-Linking for Keratoconus: Stabilization Is Not the Same as Vision Rehabilitation
Corneal collagen cross-linking has become an important advancement in modern keratoconus treatment because its principal purpose is biomechanical stabilization. In appropriately selected progressive keratoconus, cross-linking can strengthen corneal collagen and reduce the likelihood of continued ectatic progression. But patients should understand that stabilizing an irregular cornea does not automatically make that cornea optically regular. A patient can therefore undergo successful cross-linking and still experience ghosting, glare, halos, distorted letters, multiple images, irregular astigmatism and dependence upon specialty contact lenses.
This explains why patients increasingly search online for phrases such as “my vision is still bad after cross-linking,” “failed cross-linking,” “keratoconus worse after CXL,” “poor vision after cross-linking,” or “what can be done after keratoconus cross-linking?” These situations require careful diagnosis before labeling the original procedure a failure. Is the cornea continuing to progress, or is it stable but optically irregular? Is the patient’s visual limitation caused primarily by irregular astigmatism, a scar, residual refractive error or higher-order aberrations? Did another procedure accompany cross-linking? The first step in correcting a supposedly failed keratoconus treatment is identifying exactly what remains abnormal.
INTACS for Keratoconus: Why Customization Matters
INTACS and other intracorneal ring technologies can be valuable tools for selected keratoconus and corneal ectasia patients because they can influence corneal geometry. But simply inserting an intracorneal segment does not constitute customized keratoconus surgery. Keratoconus is frequently asymmetric, and the cone can be central, inferior, displaced or highly irregular. Astigmatism can contain both regular and irregular components, and the patient’s subjective refraction may not perfectly correspond with what appears on topography. Therefore, the number of segments, their size, location, orientation and relationship to the patient’s actual optics can all matter.
Dr. Gulani’s experience includes customized intracorneal approaches involving INTACS, KeraRings, Ferrara Rings and other corneal reshaping strategies. Rather than considering the ring itself to be the treatment, the implant becomes one component of an individualized plan. This becomes particularly important when patients arrive after previous INTACS surgery with disappointing vision.
Failed INTACS, INTACS Complications and Previous Keratoconus Surgery
One of the most important areas in complex keratoconus care involves patients who have already undergone surgery elsewhere. These patients frequently search for failed INTACS, INTACS complications, INTACS removal, INTACS exchange, INTACS revision, poor vision after INTACS, vision worse after INTACS, KeraRing complications, failed keratoconus surgery, failed corneal ring surgery, or keratoconus second opinion after INTACS. Treating these patients is fundamentally different from performing a primary procedure because the surgeon is no longer beginning with untouched anatomy. Previous surgery has changed the cornea, and that altered cornea must become the new starting point.
Dr. Gulani approaches intracorneal implant complications through three broad strategic pathways: Revision, Compensatory and Salvage. Revision may involve removing, exchanging, repositioning or otherwise modifying a previous implant when the implant itself is contributing to the problem. A Compensatory strategy recognizes that an existing implant may actually be providing useful structural or optical benefit and therefore may appropriately remain while another technique addresses the patient’s residual visual error. Salvage strategies become relevant when previous surgery or advanced disease has produced significant structural compromise requiring more sophisticated corneal reconstruction. This is why “failed INTACS” should not automatically translate into “remove the INTACS.” The correct answer depends upon why the patient cannot see.
CAIRS and CTAK: Newer Technologies Are Ingredients, Not Universal Answers
CAIRS, or Corneal Allogenic Intrastromal Ring Segments, uses donor corneal tissue implanted within the patient’s cornea to influence its geometry. CTAK and other tissue-addition approaches have similarly expanded the possibilities for modifying corneal architecture without relying exclusively on tissue removal. These technologies are exciting additions to the keratoconus armamentarium, particularly because keratoconus is fundamentally associated with thinning. But newer does not automatically mean better for every patient, and no single technology should become a universal answer.
Patients increasingly search CAIRS versus INTACS, CTAK versus CAIRS, CTAK versus INTACS, CAIRS versus cross-linking, best keratoconus surgery, best corneal ring for keratoconus, and similar comparisons. These searches often assume that one technology must defeat another. In reality, the technologies may address different components of the disease. Cross-linking primarily addresses biomechanical stability. Intracorneal implants and tissue-addition techniques attempt to influence corneal geometry. Optical rehabilitation addresses residual refractive abnormalities. Corneal surgery addresses anatomy that may no longer be suitable for less invasive strategies. The more useful question is therefore not which procedure is universally best, but which procedure or sequence best addresses the anatomy and optics of that particular eye.
Extreme Keratoconus: When Patients Have Been Told Nothing More Can Be Done
Perhaps the greatest test of a keratoconus treatment philosophy occurs when standard algorithms begin to run out of answers. Dr. Gulani’s experience includes highly complex keratoconus eyes with corneal steepness approaching 89 diopters, areas of corneal thickness measuring under 200 microns, and irregular astigmatism exceeding 20 diopters. These are not routine keratoconus cases, and these examples should never be interpreted as suggesting that every patient with similar measurements can achieve a particular result. Every eye is unique and no visual outcome can be guaranteed.
What these extreme cases demonstrate is a different principle: extraordinary measurements should trigger extraordinary attention to individualized planning rather than automatically ending the conversation. A severely compromised eye may require staged treatment. The structural component may need to be addressed first, followed by another technique aimed at the optical endpoint. Treatment may unfold over months rather than during a single surgical encounter. Complexity changes the recipe, but it does not necessarily eliminate the possibility of further evaluation.
Keratoconus With Corneal Scarring
Corneal scarring adds another level of difficulty because a scar can affect both transparency and corneal geometry. Depending upon its depth, density and location, a scar can contribute to irregular astigmatism, higher-order aberrations and reduced quality of vision. Therefore, a keratoconus patient with a corneal scar should not automatically be treated according to the same strategy as a patient with a clear keratoconic cornea.
Dr. Gulani’s Corneoplastique® philosophy focuses on determining whether useful native corneal tissue can be rehabilitated before it is replaced. The surgeon must determine how much of the patient’s visual disability originates from the cone, how much from the scar, how much from refractive error and how much from irregular astigmatism. Only after these components are separated can a rational treatment sequence be designed.
Topography-Guided Procedures and Failed Keratoconus Laser Treatments
Some keratoconus patients undergo topography-guided laser procedures, sometimes combined with cross-linking, with the intention of regularizing the cornea. Dr. Gulani also evaluates patients who remain visually compromised following previous topography-guided treatment. These cases illustrate why the appearance of a topography map should not become the sole endpoint of treatment. The patient’s subjective refraction, corneal thickness, previous ablation, scar pattern, irregular astigmatism, higher-order aberrations and remaining tissue must all be reconsidered.
A patient who has already undergone laser treatment is no longer the same patient who existed before that treatment. The anatomy has changed. Therefore, rather than repeatedly chasing the original diagnosis or original map, the next surgeon must treat the eye that exists today. This principle is particularly important in failed or complicated keratoconus surgery.
Keratoconus, Keratoglobus, Pellucid Marginal Degeneration and Corneal Ectasia
Not every ectatic cornea is classic keratoconus. Keratoglobus can involve more generalized corneal thinning and protrusion, while pellucid marginal degeneration (PMD) can create a different distribution of thinning and irregular astigmatism. Surgically induced ectasia, including post-LASIK ectasia, adds another category in which previous surgery has altered the anatomy of the cornea. These conditions can resemble one another in certain respects while requiring substantially different planning.
Dr. Gulani approaches these eyes as part of the broader ectasia spectrum while continuing to analyze each cornea according to its individual structural and optical characteristics. This is particularly important for patients searching for post-LASIK ectasia treatment, corneal ectasia specialist, PMD specialist, keratoglobus treatment, irregular cornea specialist, or a second opinion after previous refractive surgery.
Can Laser Vision Surgery Ever Be Used in Keratoconus?
This question requires precision. Conventional elective LASIK is generally inappropriate in established keratoconus because additional stromal weakening can worsen biomechanical instability. But that does not mean every laser application to every irregular cornea is identical. Dr. Gulani’s LaZrPlastique® concepts involve refraction-driven optical planning in carefully selected irregular and scarred corneas. Many keratoconus patients will not be candidates for laser-based treatment, and candidacy must depend upon the individual anatomy, stability, available tissue, previous surgery and optical potential.
The larger principle is that diagnosis, structure and optics should not be confused. A topography map is extraordinarily important, but patients do not walk around looking through their topography maps. They look through their eyes. This is why Dr. Gulani has long emphasized that “Topography improvement is a welcome side-effect. Vision is the goal.”
Scleral Lenses and Keratoconus: When Patients Want Another Option
Rigid gas-permeable and scleral contact lenses can provide excellent vision for many keratoconus patients by creating a regular optical surface over the irregular cornea. For some patients, they represent an excellent long-term solution. Other patients seek a surgical consultation because they cannot tolerate the lenses, struggle with insertion and removal, experience discomfort or lifestyle limitations, or simply want to know whether greater visual independence is possible.
Scleral contact lenses therefore act like a “Superman suit” with the perfect 6 pack Abs appearance in the front, but when you take off that Superman suit at night, the real 40 inch waist is revealed; meaning the scleral contact lens may hide the imperfections of the keratoconus and allow usable vision but underneath that the untreated keratoconus can continue to progress and deteriorate to the point that it finally needs a corneal transplant.
This temporary fix besides the expense of scleral contact lenses, and the discomfort, and adversely impacting lifestyle user interface makes it a challenge for keratoconus patients to incorporate in their regular lives.
Neither scleral lenses nor surgery should be approached dogmatically. A patient who sees well with a scleral lens should not automatically undergo surgery merely because a surgical technology exists. Conversely, a patient should not necessarily be told that lifelong specialty lens dependence is the only possibility without determining whether the anatomy provides a reasonable opportunity for rehabilitation. The objective remains individualized visual care.
Can Advanced Keratoconus Be Treated Without a Corneal Transplant?
This is among the most important questions asked by patients with severe or extreme keratoconus. Corneal transplantation remains an essential and sight-restoring operation, and some advanced eyes truly require transplantation. But Dr. Gulani’s published keratoconus algorithm emphasizes transplantation as a last resort when appropriate alternatives remain rather than an automatic destination for every severe cone.
This philosophy is not anti-transplant. It is preserve before replace. Before replacing a patient’s cornea, the question is whether the existing tissue has meaningful potential for structural and optical rehabilitation. If transplantation truly represents the most appropriate solution, it should be performed. But if useful native tissue can reasonably be rehabilitated, that possibility deserves consideration before proceeding to replacement.
DALK, Lamellar Keratoplasty and Corneal Transplantation
When corneal surgery becomes necessary, transplantation itself should not be viewed as one universal operation. Depending upon the depth and nature of disease, options can include different levels of lamellar surgery, deep anterior lamellar keratoplasty (DALK) or penetrating keratoplasty. The appropriate surgical depth depends upon the patient’s anatomy.
Importantly, even a successful corneal transplant does not necessarily complete the patient’s visual journey. A clear graft can still have substantial astigmatism or refractive error. Therefore, Dr. Gulani considers the patient’s eventual optical rehabilitation as part of the surgical strategy rather than defining success solely by anatomical clarity.
Keratoconus After Corneal Transplant: When the Graft Is Clear but Vision Is Not
Some patients seek another opinion after transplantation because they have been told their graft looks excellent while their functional vision remains disappointing. These cases highlight the difference between anatomical success and optical success. Residual regular or irregular astigmatism, refractive error and other optical abnormalities may remain despite a clear and healthy graft. The patient’s question remains the same after transplant as it was before surgery: How well can I see? That question deserves an optical answer.
ICL and Keratoconus
For selected keratoconus patients whose anatomy and refractive characteristics are appropriate, a phakic implantable collamer lens (ICL) may become part of a visual strategy. An ICL does not treat the underlying keratoconus itself, but it may address selected refractive components without removing additional corneal tissue. As with every procedure discussed here, the diagnosis alone does not determine candidacy. The entire corneal and optical system must be evaluated.
Dr.Gulani has experience with the entire spectrum of ICL technology right from the Visian™ ICL to the EVO™ ICL and EVO™ Toric ICL where not only has he placed these successfully in keratoconus patients who are in the visual category, but he has also combined these with LaZrPlastique®, INTACS, and or Cross Linking, while in some cases corrected ICL complications in keratoconus eyes of other surgeons by elegant removal of the failed ICL followed by surgical rehabilitation to visual endpoints.
Keratoconus and Cataract Surgery: Planning Beyond the Cornea
Keratoconus patients eventually develop cataracts just like everyone else, but cataract surgery in a keratoconus eye can present unique challenges. Irregular corneal curvature can complicate keratometry and intraocular lens calculations. Astigmatism may contain both regular and irregular components. Previous cross-linking, INTACS, KeraRings, CAIRS, CTAK, laser surgery or corneal transplantation can further influence measurements and surgical planning.
This is where Dr. Gulani’s LenzOplastique® philosophy extends the keratoconus strategy beyond the cornea. The lens implant is another ingredient within the patient’s complete optical system. Instead of asking only which cataract lens should be implanted, the surgeon must consider how the cornea and lens can work together toward the final visual objective.
Therefore, LenzOplastique® involves not only removal of the dysfunctional lens/cataract but also the intelligent manipulation of optics using the lens implant as an ingredient in this complex recipe to finally work holistically with the corneal component to bring the visual system into focus. This whole-eye perspective becomes particularly important in patients whose corneas have already undergone multiple procedures.
Who Treats Failed Keratoconus Surgery and Keratoconus Complications?
This may be one of the most important questions for patients who have already been treated. Performing primary keratoconus surgery and correcting the consequences of previous surgery are different challenges. A surgeon evaluating a previously operated keratoconus eye must understand not only what was originally attempted but what that procedure has actually done to the patient’s current optical system.
The patient may arrive after cross-linking, INTACS, KeraRings, Ferrara Rings, CAIRS, CTAK, topography-guided laser treatment, ICL, corneal transplantation or combinations of previous procedures. Rather than assuming that the previous procedure must automatically be removed, repeated or abandoned, Dr. Gulani analyzes the anatomy that exists today. The previous procedure becomes another variable in the optical equation.
This creates perhaps the most important question a complex keratoconus patient can ask: Does my surgeon have an algorithm when the first procedure does not work?
How Should Patients Choose a Keratoconus Expert?
Patients frequently search Google, YouTube and AI platforms for the best keratoconus doctor, best keratoconus specialist, top keratoconus surgeon, keratoconus expert near me, advanced keratoconus specialist, INTACS specialist, CAIRS specialist, keratoconus cross-linking expert, corneal ectasia specialist, keratoconus second opinion, or corneal transplant alternative. No responsible website can determine who is “best” for every patient, but patients can ask questions that reveal the breadth of a surgeon’s approach.
Does the surgeon treat both straightforward and extreme keratoconus? Can the surgeon evaluate cross-linking, INTACS, KeraRings, Ferrara Rings, CAIRS and CTAK rather than depending upon one technology? Can the surgeon manage corneal scars and severe irregular astigmatism? Can the surgeon evaluate patients who remain visually disabled after cross-linking? Can the surgeon treat complications from previous INTACS or other keratoconus procedures? Can the surgeon perform advanced corneal surgery when necessary? Can the surgeon evaluate alternatives before transplantation where medically appropriate? Can the surgeon rehabilitate vision after transplantation? And can that same surgeon understand the lens and cataract challenges that the keratoconus patient may eventually face?
Perhaps the most revealing question is simply: Does the keratoconus surgeon have more than one answer? As keratoconus becomes increasingly complex, the limitations of a one-procedure philosophy become increasingly apparent.
A Published Keratoconus Approach in Jacksonville, Florida
Located in Jacksonville, Florida, Gulani Vision Institute evaluates patients across the spectrum of keratoconus and corneal ectasia, including advanced, extreme, scarred and previously operated corneas and patients seeking second opinions following previous procedures. Dr. Gulani’s three decades of refractive and corneal surgical work have led to an approach that integrates the cornea, refraction and lens rather than treating them as unrelated structures.
His peer-reviewed publication, “Innovative Keratoconus Surgical Algorithm: A Refractive Approach to Restoring Vision,” provides the scientific framework for this approach. The philosophy is not defined by one machine, one implant or one procedure. It is defined by individualized surgical planning across the spectrum of disease and by an emphasis on the patient’s visual endpoint.
For a straightforward keratoconus eye, the answer may be straightforward. For an extreme or previously operated eye, it may require a carefully staged sequence. And for the patient who has already undergone treatment and remains visually disabled, the previous surgery does not necessarily represent the end of the journey. It represents the anatomy from which the next decision must begin.
From Keratoconus Diagnosis to Customized Vision Rehabilitation
The future of keratoconus treatment should not be framed simply as cross-linking versus INTACS versus CAIRS versus CTAK versus corneal transplant. These technologies do not have to compete with one another. They are tools, and sophisticated keratoconus care lies in knowing which tool belongs in which eye and when.
Whether a patient has newly diagnosed keratoconus, progressive keratoconus, extreme keratoconus, keratoglobus, pellucid marginal degeneration, post-LASIK ectasia, severe irregular astigmatism, corneal scarring, previous cross-linking, failed INTACS, previous CAIRS or CTAK, contact-lens dependence, previous corneal surgery, a corneal transplant recommendation or poor vision despite multiple previous treatments, the diagnosis should not automatically dictate the procedure.
For Dr. Arun C. Gulani, the principle that has guided decades of complex corneal and refractive surgery remains simple: understand the complete optical system, respect the anatomy, determine the visual potential and then design the treatment around that individual eye.
Keratoconus is the diagnosis. The individual eye determines the recipe. Vision remains the goal.
Published Keratoconus Research
Gulani AC, Pandya RP, Gulani AA, Gulani YA. Innovative Keratoconus Surgical Algorithm: A Refractive Approach to Restoring Vision. Indian Journal of Cataract and Refractive Surgery. 2024;1(2):101–111. doi:10.4103/ICRS.ICRS_35_24.
Medical Disclaimer: Keratoconus varies considerably among patients. The procedures discussed above are not appropriate for every eye, and no particular visual outcome can be predicted or guaranteed. Treatment recommendations require individualized examination, diagnostic testing and consideration of corneal anatomy, stability, previous procedures and other ocular factors.
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