Nerves in the anterior cornea are severed during creation of the LASIK flap. Deeper corneal nerves are destroyed by laser ablation during LASIK. Medical studies demonstrate that corneal nerves do not recover normal densities and patterns after LASIK. Some patients report severe eye pain after LASIK. Eye pain after LASIK is frequently diagnosed as dry eye, but there may be more to it than just dry eyes in some cases. Confocal microscopy examinations of post-LASIK corneas reveal aberrantly regenerated nerve fibers in the cornea, which may lead to corneal neuralgia (pain). For some patients, eye pain after LASIK is incapacitating.
If you experience pain after LASIK, you should file a MedWatch report with the FDA. You may also call FDA at 1-800-FDA-1088 to report by telephone, or download a copy of the paper form and either fax it to 1-800-FDA-0178 or mail it using the postage-paid addressed form. Read a sample of LASIK MedWatch reports currently on file with the FDA.
Faith A. Hayden. Treating unexplainable pain. EyeWorld, March 2012
From the article: "Patients go to their ophthalmologists, some of them suicidal because of the pain, and their eyes on the slit lamp look perfectly normal," said Perry Rosenthal, M.D., founder, Boston Foundation for Sight... No one knows exactly what causes this neuropathic pain to develop after photorefractive keratectomy (PRK) and LASIK, but there are some theories. First, it's important to note that the cornea is the most powerful pain generator in the human body, 200 times more powerful than skin. "The most common cause of neuropathic pain anywhere in the body is damage to the sensory nerves," Dr. Rosenthal said. "Obviously, LASIK and PRK are classic examples of this. It's what happens next after the damage that determines if the post-op pain resolves as the corneal tissue heals or whether it triggers the development of that chronic disease called neuropathic pain."
EyeWorld, February 2012. Ectasia, topography readings hot topics among military refractive surgeons
From the article: Corneal neuralgia is a newly described disease process refractive surgeons wish was mythological. Lt. Cmdr. John B. Cason, M.D., cornea, external disease, and refractive surgery, Naval Medical Center, San Diego, gave an overview of the symptoms, which many patients find excruciating. "The hallmark of this is how uncomfortable these patients are," he said. "But when you examine them, you don't see anything causing it. These patients are extremely difficult to treat; they keep coming back to your clinic. All the therapies you give them fail, and because of this, many of us think they're making it up." The pain these patients are feeling, however, is very real. Some patients are so uncomfortable and so despondent over failed treatments that they become suicidal. As one patient Dr. Cason had in fellowship said, "I want my eyes taken out or I want to die."
Patient with corneal neuropathy after LASIK files injury report with the FDA
I had LASIK eye surgery in [redacted] 2009. Two weeks later I started to suffer with severe headaches and severe eye pain, in addition I had sudden vision regression. I have been seeing a neuro-ophthalmologist at the [redacted] for my condition. I have been diagnosed with a rare form of corneal neuropathy pain from LASIK.
Patient Testimonial - Matt K
I had LASIK with IntraLase technology in 2006. For the first two years after LASIK, I experienced intense, unremitting eye pain and dry eyes. My LASIK surgeon focused solely on treating the dry eye condition with the expectation that the extreme eye pain I was experiencing would resolve as my dry eye condition improved. At one year post-LASIK, my dry eyes had moderately improved but the intense, unremitting eye pain intensified to a level that was nearly unimaginable. I started seeing a neurologist when it was determined that I had post-LASIK induced neuropathy. I tried many different neurological pain medications including Garbentin and Lyrica in addition to Restasis and lubricating drops for dry eyes; however, the pain was intractable.
At about 2.5 years post-LASIK my neurologist prescribed Verapamil, which helped more than any other medication. I'm also taking Carbamezipine (i.e. Tegretol). I'm currently on 240 mg. of Verapamil and 800 mg. of Tegretol. I still get eye pain, but the pain level is much less than it used to be and I can go days, if not weeks at times, without pain. When I do get pain, it's usually only for a day or two. Even then, I've recently found a medication that helps. It's called Butal-Acetamin-CAF 50-325-40. I use this like most people use Ibuprofen. On the occasional days when I have eye/head pain, I take one tablet for a day or two and it helps.
I should note a few additional things that I still do on a daily basis. I take 3 fish oil softgels a day for my dry eyes (TheraTears Nutrition 1200 mg Omega-3 supplement) and I have a 5-minute warm compress routine followed by a TheraTears SteriLid eyelid cleanser scrub using a Q-tip to gently go across my upper and lower eyelids. I let the eyelid cleanser sit on my lids for at least 60 seconds and then I rinse my eyes well. This routine is primarily to treat my dry eyes because, while the dry eye has improved from my early post-LASIK days, it still can negatively affect my quality of life if I don't stick with the routine.
I also tried different holistic remedies during the first 2 years post-LASIK including approximately 40 acupuncture sessions and 30 cranial sacral therapy sessions. I think both helped to a degree but neither allowed me to fully regain my quality of life.
While I'm not certain that each medication I take will work the same for another post-LASIK patient with chronic eye pain, I am certain that there's lots of different medications to treat neurological pain and you need to work with a good neurologist who’s caring enough to work with you through the trial process. I know the process can be long and painful, but please understand that there is a light at the end of the tunnel and you can get there.
The cornea is the most highly innervated tissue on the surface of the human body. When the cornea is damaged, the corneal nerves can emit an incredible amount of intense physical pain. There is a good reason why most eye doctors wear glasses and do not get LASIK. Due to greed, the eye care community does not feel a sense of obligation to insist that a harmful procedure like LASIK not be done on the general public. Remember, the health and well-being of your eyes are at stake and you only get two eyes in this lifetime.
I should note that I have 20/20 vision from LASIK, but I wish that I could turn back the clock and go back to glasses. LASIK surgeons often have very few options to fix LASIK complications. Therefore, if you become one of the LASIK complication statistics, you will find yourself in a place you wish you never knew existed.
Email sent to an eye doctor - 11/25/2011
My Wish: I had Lasik eye surgery in August 2009. Two weeks later I started to suffer with severe headaches and severe eye pain, in addition I had sudden vision regression. I have been seeing Dr. [REDACTED] a Neuro-ophthalmologist at the [REDACTED] for my condition. I have been diagnosed with a rare form of corneal neuropathy pain from Lasik. I have been on 800 mg Gabapentin 3x's a day, using Restasis twice daily, 800mg IB Profen daily, Ambien to sleep, have just been fitted with the scleral lenses, Wellbutrin and Zoloft. I also had an MRI that came back normal. The intensity and constancy of corneal neuralgia can be incapacitating. It has been 2 years and 3 months of daily chronic pain. I am desperately searching for help! I believe there may be solutions for me, but I do not have the finances to search for different types of treatments or search out doctors that may have the answer. I am searching for help so I can find doctors to help me, try acupuncture or any other natural or holistic medicines, I will and want to try everything I can to help me stop this pain. I can see what this pain has been doing to me when I look in the mirror; I honestly feel like I have aged ten years since my surgery and wonder how it will be possible to continue to face this in the years to come. I am a good person and want to be that active, hard working person again. I would never take your help for granted. I am pleading with you to open your heart and help me, my life is at stake. I am only 39 years old and I have been feeling like I can no longer go on with this suffering I have become extremely depressed. This is my sincerest, desperate cry for any help you may give me. Sincerely, [REDACTED]
Miriam Karmel. Addressing the Pain of Corneal Neuropathy. EyeNet, Jul/Aug 2010.
From the article: "A woman with devastating, unrelenting eye pain and photophobia presented to Perry Rosenthal, MD, after being dismissed by a number of other physicians. First she had seen two different ophthalmologists, who found no supporting signs for her pain and recommended psychiatric treatment. The psychiatrist recommended a pain specialist, who said she suffered from corneal neuralgia and referred her on to a cornea specialist, who, in turn, told her there is no such disease...
The cornea is the most powerful pain generator in the human body, said Dr. Rosenthal. The density of corneal pain receptors has been estimated to be 40 times that of dental pulp. He explained that the damaged nerve fibers in the cornea, the sensory fibers, cause all the symptoms, whether or not the initial disease is severe dry eye or corneal neuropathy.
The intensity and constancy of corneal neuralgia can be incapacitating and even induce thoughts of suicide, said Stephen C. Pflugfelder, MD. Dr. Pflugfelder, who is professor of ophthalmology and director of the Ocular Surface Center at the Baylor College of Medicine in Houston, had a patient with so much corneal neuropathy following LASIK that he begged to have his eyes enucleated."...
"Jayne S. Weiss, MD, professor of ophthalmology and pathology at Kresge Eye Institute in Detroit, recalls such a case. A young man presented to her with excruciating corneal pain and evidence of a healed lamellar keratotomy. “Confocal microscopy revealed abnormal collections of unusually tortuous corneal nerves consistent with corneal neuropathy. Although vision eventually recovered to 20/20, the patient had asked at one point if he could have retrobulbar alcohol injected to dull the pain,” she said."
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Carlos Belmonte, MD, PhD. Eye Dryness Sensations After Refractive Surgery: Impaired Tear Secretion or "Phantom" Cornea? Journal of Refractive Surgery Vol. 23 No. 6 June 2007
A negative side effect of this therapy is the high incidence of abnormal sensations that occur to the ocular surface. The most common complaint is ocular dryness, which appears in >40% of patients who undergo PRK and LASIK, particularly on waking...
The application during photorefractive surgery of a laser beam to the stromal surface, after debridement of the epithelium (PRK) or cutting a corneal flap with a microkeratome (LASIK), incurs damage to the corneal nerves. Corneal nerves are present in the external third of the stroma and form a dense subepithelial plexus from which branches ascend, traversing the Bowman's layer to enter the basal epithelial layer...
Nerve damage is evidenced morphologically by an altered appearance of stromal and subepithelial nerve trunks seen with confocal microscopy in operated human corneas and by a reduction in their number, which persists months after surgery. Experimental studies in animals have additionally shown that after injury of the peripheral branches, some of the corneal trigeminal ganglion neurons die, whereas the rest initiate, with variable success, the regeneration of their peripheral, cut stumps and form nerve-end neuromas in the borders of the wound. Also, peripheral axons of uninjured neurons innervating neighboring territories sprout and invade temporarily the denervated areas with new axonal branches. Furthermore, injured nerves exhibit altered functional properties. In intact afferent fibers, impulse generation occurs exclusively at the sensory endings. Nerve fibers cut during surgery lose their distal end, ie, the transduction area where specific stimuli are converted into a discharge of propagated nerve impulses. Consequently, responsiveness to natural stimuli is impaired. It is well established that axotomized sensory neurons also change the expression of ion channels involved in the transduction and generation of nerve impulses. This leads to abnormal intrinsic electrical excitability at injured nerve stumps, which causes appearance of spontaneous impulses (ectopic activity) and abnormal responsiveness to minimal stimuli at damaged sensory fibers, producing dysesthesias and neuropathic pain of peripheral origin. This neuropathic pain develops spontaneously or is evoked by stimuli that under normal conditions would not elicit such a response, applied on or near the cut end of an injured sensory nerve, giving rise to abnormal sensations including the "phantom limb" sensations reported by patients with amputated extremities.
Vanessa Caceres. Not all post-op dry eye is dry eye. EyeWorld
"Dr. Tervo theorized that all dry-eye symptoms patients experience more than a year after refractive surgery may not actually be dry eye; instead, they are caused by aberrantly regenerated nerve fibers in the cornea."
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Oliver Stachs, PhD; Andrey Zhivov, MD; Robert Kraak, MD; Marine Hovakimyan, PhD; Andreas Wree, MD and Rudolf Guthoff, MD. Structural-functional Correlations of Corneal Innervation After LASIK and Penetrating Keratoplasty. Journal of Refractive Surgery Vol. 26 No. 3 March 2010
Although two-dimensional mapping after LASIK was achieved only with reduced quality, none of the patients showed a whorl-shaped [normal] pattern of the subbasal nerve plexus. Nevertheless, morphological changes in nerves were found. One week after LASIK, no nerve fibers were found at all, and only very thin nerve fibers were present 1 month after surgery. In 9 of 10 eyes, the subbasal nerve plexus was present in the central flap zone and corneal sensitivity was positive in these corneas. During follow-up, the number of nerves returned to near-normal. However, nerve fibers were mostly non-branching and intensively curved...
Degeneration of nerve structures, characterized by thinning or even complete absence of subbasal nerve fibers, is visible in the flap area just a few hours after LASIK. The subbasal nerve plexus was not detectable 1 week after LASIK, although the first very thin nerve fibers were visualized 1 month after the procedure. Although the subbasal nerve plexus incorporating parallel and branched fibers began to be visualized 1 year postoperatively, complete physiological reinnervation was not seen up to 2 years after LASIK. The whorl-shaped [normal] configuration of the subbasal nerve plexus was not detected in any patient. In most cases, the subbasal nerve fibers recovered to a near-normal state but abnormal curved or thin and non-branching subbasal nerves were found in all corneas.
Disclaimer: The information contained on this web site is presented for the purpose of warning people about LASIK complications prior to surgery. LASIK patients experiencing problems should seek the advice of a physician.