Corneal perforation and its repair, and re-perforation, and re-repair in a Sjogren’s syndrome patient Mary E. Kutch, OD Indiana University School of Optometry resident- Guanajuato, Mexico 2008-9 PUCO resident- Johnathan M. Wainwright Memorial VAMC, Walla Walla, WA 2007-8 Abstract: A report of the spontaneous corneal perforation in a rheumatoid arthritis patient with secondary Sjögren’s syndrome, detailing its repair, re-perforation, re-repair, complications, and co-management throughout, as well as alternative repair strategies. A 78yo Caucasian male with rheumatoid arthritis and secondary Sjögren’s syndrome presented to our clinic reporting a “blurry, leaky, red, itchy,” severely light-sensitive right eye and crusting discharge for 3 days- without any associated trauma. His current systemic medications included 200mg of Hydroxychloroquine taken twice a day and 20mg of Leflunomide for his Rheumatoid arthritis, as well as treatment for hypertension, hypothyroidism, depression, and atrial fibrillation. His ocular history includes bilateral inferior punctal cautery for keratoconjunctivitis sicca and sterile peripheral corneal ulcer of the left eye five years prior. Current ocular medications are limited to Refresh Plus unit dose, prescribed 5+ times per day- but patient commenting that he is using it every morning, and, “my wife says I should use it more often.” Uncorrected visual acuities measured 20/150 in the right eye, improving with pinhole to 20/60 and left eye at 20/40. Previously, vision was correctible to 20/20 in both eyes. The right pupil was miotic, with a marked consensual pain response. Slit lamp examination of the right eye revealed 3+ conjunctival injection, a shallow anterior chamber, and 2x1.8mm ulcerated area with a 0.3mm centrally eroded area inferior to the line of sight. Fluorescein stain confirmed a positive Seidel’s sign, and Goldmann Tonometry measured the intraocular pressures at 0 and 11mmHg OD/OS. The nearest corneal specialist, 50 miles away, was consulted, with emergency surgical referral available in 2 hours to repair the perforated corneal ulcer. One drop of Homatropine 5.0% was instilled in-office in the right eye, as well as Ciprofloxacin HCl 0.3%, to be used every 15 minutes until corneal consult. The patient was also instructed to increase his dosing of Refresh Plus to at least four times per day in the other eye. Without trauma, what led to the perforation of this cornea? The cornea is an avascular tissue, made up of stratified squamous non-keratinized epithelium, with microplicae extending at its surface.4 A glycocalyx clings closely to these microplicae and helps maintain a moist, translucent, and resilient window to the world. 4 Its hydrophilic glycosylated extracellular domain attracts the liquid tearfilm as well as repels pathogens, and allows the lids to glide past.4 The tearfilm plays a crucial role in maintaining the health and transparency of the cornea, with its major components flowing from the Meibomian glands and lacrimal gland, minor contributions from the accessory glands of Krause and Wolfring, and conjectured assistance from the sebaceous glands of Zeiss and sweat glands of Moll.4 In secondary Sjögren’s syndrome, the almond-sized lacrimal gland is attacked by CD4, B and T lymphocytes due to an autoimmune disease, such as rheumatoid arthritis (RA.) Additionally, with RA, due to the induced androgen-deficient state- it is thought that there is decreased anti-inflammatory cytokine and transforming growth factor-β (TGF- β) released. 4 In general, immune-mediated inflammation is thought to play a part in keratoconjunctivitis sicca- with unstable corneal epithelium and infection exacerbated by deficient surface immunity- as well as the upregulation of degrading collagenases and matrix metalloproteases in the corneal epithelium. Additionally, deposition of immune complexes in the limbal vessels result in activation of complement and chemotaxis of inflammatory cells further worsening the condition.12 Topical NSAIDs also induce this process, increasing the expression of proteases, such as MMP-1 and -8, which degrade the corneal epithelium and can result in ulcerative keratolysis, as has been reported in the literature following cataract surgery in a Stevens Johnson syndrome patient8. Rheumatoid arthritis (RA) is a common chronic disease, affecting about 1% of the population worldwide.7 However, it remains unknown what sparks the start of inflammation and continues it within the joints- or extra-articularly in those testing positive for Rheumatoid Factor (RF,) but not all.7 Some theories pinpoint the origin as a mesenchymal disorder. Diagnosis includes four or more of the following: morning joint stiffness lasting at least an hour, arthritis of three or more joints, arthritis of the proximal interphalangeal, metacarpophalangeal or wrist joints, symmetric arthritis, subcutaneous nodules, positive test for rheumatoid factor (RF) and radiographic erosions or perarticular osteopenia in hand or wrist joints7. RA presents with extra-articular complications in only 25% of its sufferers, manifesting rheumatoid nodules (found on the sclera), fistulas, hematological abnormalities, vasculitis, renal disease, pulmonary disease, and cardiac complications12. When RA expresses itself in the lacrimal and salivary glands, with resulting keratoconjunctivitis sicca and decreased salivary gland flow, with presence of autoantibodies, it is then termed “Sjögren Syndrome.” Sjögren’s Syndrome (SS,) as described originally by Henrik Sjögren in 1933, is a chronic autoimmune inflammatory disorder characterized by lymphocytic infiltration of lacrimal and salivary glands, leading to dry eye and mouth.5 “The exact etiology is unknown, but involves genetic and environmental features- The lacrimal and salivary glands become infiltrated with CD4+ T helper and some B cells, salivary epithelial cells express high levels of HLA-DR, antibodies made within the gland are directed against rheumatoid factor (Fc region of IgG) and antinuclear antigens (SS-A, SS-B), which are not specific to salivary or lacrimal glands.” 5 Interestingly, genetic predisposition in Caucasians is linked to HLA-DR3 and to heterozygosity of HLA-DQ, but different genetic markers in other ethnic groups. 5 Sjögren syndrome can occur alone or secondary to rheumatoid arthritis, systemic lupus erythematosus, or progressive systemic sclerosis. Patients with SS suffer from decreased production of the aqueous portion of tears due to the destruction of the serous glands as well as interruption of their neurovascular innervation. 5 The imbalance in aqueous and mucinous tear secretions leads to a relative increase in tenacious secretions and decreased tear breakup time as well as increased debris in the tears, which lead to decreased visual acuity, discomfort, filamentary keratitis, blepharitis (due to Meibomian gland abnormalities,) foreign body sensation, red eye, or painful eye, but not commonly photophobia.5 The treatment goals of SS are to decrease symptoms and slow progression. This is done topically with artificial tears, environmental changes (directing air vents away from the face, a humidifier in the home, or even moisture chamber goggles,) as well as systemic immunomodulators when the erythrocyte sedimentation rate (ESR) is elevated. In patients with arthralgias, treatment with antimalarial drugs is helpful, as well as steroids, nonsteroidal anti-inflammatory drugs (NSAIDs,) azathioprine, and chlorambucil.5 By the time our patient presented to the referral center, notes indicated the ulcerated area had increased to 1.7mm vertically x 4mm horizontally, with 0.5mm area of perforation. No infiltrates were seen, but the cornea had 1+ diffuse stromal edema. The anterior chamber was still described as flat, without hypopyon. A same-day corneal lamellar patch graft was recommended with probable tarsorrhaphy and/or conjunctival graft. Surgical repair consisted of anesthetizing the right eye, making a paracentesis in the cornea opposite the wound, filling the anterior chamber with viscoelastic (thus deepening it,) and an 8mm trephine was used to mark off the ulcerated section of cornea. The marked area was dissected with a diamond blade, and lamellar dissection performed with additional use of a crescent blade. A ½ disc of lamellar donor cornea, shaped to match the defect, was secured over the area using 10-0 nylon, with multiple interrupted sutures, carefully sparing central vision. The inferior conjunctiva was then dissected free of Tenon’s capsule and a bucket-handle of conjunctiva was made and glued to the corneal graft using Tisseel fibrin glue. Additionally, a small amount of 2% Xylocaine was injected into the superior punctal area, followed by hot-point cautery to the superior punctum. Lastly, 2% Xylocaine was also injected into the middle of the grey line of the upper and lower eyelids. 5-0 Dacron suture was passed in a double-armed fashion over silicone dams and tied on the upper eyelid to create a temporary tarsorrhaphy. At the one-day post-op appointment, the pt reported the right eye “felt fine.” Visual acuity was limited to light perception only in this eye. Slit lamp biomicroscope examination revealed 1+ periorbital ecchymosis, intact tarsorrhaphy, with a small opening nasally. The conjunctival patch graft flap was barely visible on left gaze, sutures were intact, and graft in good position. Medications now included Prednisolone acetate 1.0% four times per day in the right eye, as well as oral Cephalexin (250mg four times per day for five days,) Percocet as needed for pain and Ciprofloxacin qid OD. No topical steroids were prescribed initially to allow for maximal corneal healing. Follow-up was indicated for 10 days later. However, the patient returned to the clinic earlier than scheduled- 10/16/07 because his suture had come loose- snagged when he wiped his lid with a tissue. The eye comfort was “okay, but a little watery” and vision “is pretty good now that the lid opened a little.” Visual acuity was 20/40-3 unaided, improving to 20/40+2 pinhole. Lids showed trace ecchymosis, intact temporary tarsorrhaphy, 1-2+ conjunctival injection inferiorly. The cornea had a conjunctival flap over the inferior 20% (and covering 80% of patch graft) with the patch graft in excellent position with several interrupted sutures, remaining cornea clear. No Seidel sign was present, the anterior chamber was deep and quiet, and the iris normal. The remainder of the temporary tarsorrhaphy was then removed without complication. The medication schedule was then altered to: discontinue Ciprofloxacin OD, continue PredAcetate 1.0% qid, and use preservative-free artificial tears every 15 to 30 minutes. Follow-up was revised for two weeks later. The patient again returned sooner than scheduled, 10/22/07, to our clinic at the Jonathan M. Wainwright Memorial VA Medical Center. This time, he reported that his vision was blurred in the right eye and itchy. He was using PredAcetate 1.0% qid as instructed and Refresh Plus unit dose every 30 minutes in both eyes. Visual acuity measured 10/80 (Feinbloom). Slit lamp examination noted Gr 1+ dermatochalasis of both lids without tarsorrhaphy, quiet conjunctivae, and a corneal lamellar patch graft inferior to the line-of-sight with interrupted sutures and conjunctival flap. The graft was clear, without infiltrates. Blood staining was present on the endothelium at the top of the crescent of the graft (see photo 1). The anterior chamber Photo 1: 13 days post lamellar patch graft contained pigmented cells and trace white cells, but no flare. The iris remained flat and round. The patient was to continue with the same medication schedule, refrain from rubbing the eye, and gently clean the outer corner of right temporal lid with moistened cotton-tip applicator bid to decrease itching. No sutures were removed. Follow-up was scheduled at the surgical center for 11/3/07. The follow-up appointment shifted to 11/21/07, nearly three weeks later, at which time the graft was doing well, vision had stabilized at 20/25 and all remaining exposed sutures were removed. One week later, the patient returned to the referral center due to a watery eye- stating, “This is noteworthy, because I don’t make tears.” Vision had reduced to count fingers at 3 feet in the right eye. Slit lamp exam was remarkable for a 5x1.2mm epithelial defect on the graft with melting/thinning at the superior graft-host junction and positive Seidel sign. Same-day surgery was performed with viscoelastic injected to deepen the anterior chamber, and a Gundersen (conjunctival) flap covered the entire cornea. Visual acuity was measured as light projection OD and 20/25+ in the left eye. 11/29/07 the patient returned to our care the following morning, at which time the pressure patch was removed in-office and lids were cleaned with sterile eye wash. Current medications include Ofloxacin (one drop hourly in the right eye) and oral pain medication. Lids were remarkable only for dermatochalasis, the right eye cornea was covered by total conjunctival flap, well-apposed, with tissue glue at the seal inferiorly and 2 interrupted sutures. No Seidel sign was present. The anterior chamber appeared deep through the conjunctival graft, no hypopyon was seen, and the iris was visible. Intraocular pressure was soft and equal to the left eye by palpation. Medications were to be continued as directed, and then Ofloxacin decreased to four times daily the following day. Fox shield was to be used at night until follow-up the next week. However, that evening, the patient presented to the emergency room reporting extreme eye pain. He was given topical scopolamine and timolol 0.5%, after consultation with the patient’s surgeon. In the morning, the right eye intraocular pressure measured 57mmHg by Tonopen and angle closure or retained viscoelastic in the anterior chamber was presumed, since the view of the anterior segment was obscured by the conjunctival graft and tissue glue. Over the course of the day, the intraocular pressure slowly decreased to 37mmHg with the use of oral acetazolamide, as well as topical anti-glaucoma medications in-office. One week postoperatively, the patient reports a feeling of improved sight OD, no eye pain, but depth perception problems. Current ocular medications for the right eye included Ofloxacin four times daily, Refresh Plus (carboxymethylcellulose 0.5%) every 30 minutes, Bimatoprost twice daily, Brimonidine four times daily, Scopolomine twice daily and Cosopt (timolol 0.5% and dorzolamide 2.0%) four times daily to reduce the intraocular pressure. Visual acuity has improved to hand motion at 6 feet OD, with a pharmacologically dilated pupil. Slit lamp examination reveals the total conjunctival flap apposed to cornea with 2 sutures, decreased corneal edema, and the original corneal patch graft able to be visualized inferiorly through the conjunctival graft. The anterior chamber was well-formed and the iris was visible. (See Photo 2.) Intraocular pressure is now reduced to 8mmHg in the right eye. Ofloxacin, Brimonidine, and Bimatoprost were then discontinued, with Scopolomine continued twice daily and Cosopt reduced to twice daily, as well as Refresh Plus q30min. 12/14/07, 1 week later, pt returns to clinic reporting “scratchy feeling” on one occasion, but no pain. Visual acuity has again improved to 8/600 Photo 2: 7 days post total conjunctival graft (Feinbloom) in the right eye (with pharmacological mydriasis). Slit lamp exam is consistent with the prior visit, no staining with fluorescein OU, and intraocular pressure 10mmHg in the right eye. Cosopt and Hyoscine were then discontinued, with Refresh Plus q30min, warm compresses qam with non-preserved saline recommended for “washing” eyes. While our patient’s corneal perforation was repaired with a corneal lamellar patch graft, then conjunctival graft, many alternatives exist and there aren’t any clear guidelines for the indications of surgical procedures or systemic management of rheumatoid corneal perforations2. In the most traditional sense, a penetrating keratoplasty could be performed to repair a perforation, but due to the risk of rejection, particularly with inflammatory disease, and the small size of the perforation, it could be considered overkill. Most successful with small (<1.5mm diameter) perforations, cyanoacrylate glue with or without a bandage contact lens has been used for acute repair13,15,16,21,22. With the advantage of in-office application at a slit lamp biomicroscope, glue is inexpensive and readily available16. Several polymers of cyanoacrylate glue are on the market (N-heptyl, isobutylacryl, methyl-2-, octyl, etc…), with their main difference being the length of the carbon sidechain16. The longer the sidechain, the longer the glue takes to polymerize, but less formaldehyde is released and it is less toxic to the corneal tissue16. Due to optimum combination of these two factors, Adhist (N-butyl-2-cyanoacrylate glue was favored by Sharma, et al16. Fibrin glue (Tiseel) is also frequently used for this type of repair, and has been shown as effective as cyanoacrylate glue, with less inflammatory effects, less corneal vascularization, and more physiologic healing16. It is made at a local blood bank and is also readily available16. A bandage contact lens alone would be considered a very conservative approach, and would work better in someone who is a fast-healer- not an immune-modulated corneal perforation.23 Amniotic membrane is also being used to patch corneal perforations, but is more expensive and not as readily available. A more novel and non-biological approach, the Neuro Patch is a polyurethane patch which is used as a dura mater substitute in neurosurgery13. It is biocompatible and allows for migration of connective tissue without inflammatory cells as found on a histological examination13. Autologous lamellar scleral patching has been used when glue failed- the superior conjunctiva is dissected, a small circle of sclera is then cut with a trephine, sewn to fit over the corneal defect with 10-0 nylon sutures, and covered with a bandage lens14. Within 1 month in the study by Prydal, it was transparent. The transparency of scleral tissue can be explained by various theories- including the corneal collagen fibers replaced the scleral fibers, or that sclera needs an epithelium covering it, or it will thin. The advantage to using one’s own sclera is that it is readily available, there is no risk of rejection, and it has high tensile strength14. Deep lamellar keratoplasty is also being used to “plug the hole from the back” without the higher risk of rejection and induced irregular astigmatism like a penetrating keratoplasty, but still requiring a fresh donor cornea and is a technically more difficult surgery17. Tectonic keratoplasty, also known as a “covering graft,” works well for larger perforations or melted corneas11,20. A 360’ periotomy of the conjunctiva is performed, and the entire donor graft is sewn on top11. The donor graft has been stored in glycerin and is white opaque11. While not optimal for visual results, it preserves the integrity of the globe while waiting for a transplant or may degrade, exposing a healed cornea11,20. Returning to our patient, he returned in January for a follow-up visit, three months after the first onset of perforation. At this time, he has no complaints or reported changes in his vision and ocular comfort, feels he has usable vision for mobility/peripheral awareness OD. Current ocular medications are limited to faithful Refresh Plus use hourly OU. His visual acuity is slightly reduced at 6/600 OD, but pupils react normally. Upon slit lamp exam, there is a transparent, bulbous, fluid-filled avascular lesion at the nasal limbus, near the site of the patch graft which does not stain with fluorescein dye, no Seidel sign was present, and intraocular pressure was normal. (See Photos 3 & 4) While concerns include a second anterior chamber forming from re-perforation and leakage under the conjunctival graft, same-day consultation with the patient’s surgeon identified the lesion as an epithelial inclusion cyst, with biannual observation recommended and no negative effect toward prognosis expected. Epithelial inclusion cysts are typically avascular, pearly, white masses in the cornea, which do not stain with fluorescein dye and present on the cornea or limbus9,10. They are created by residual conjunctival epithelial cells that remain under the graft, proliferate in the anterior stroma and goblet cells secrete mucus into a central cavity10. They are most frequently found following corneal surgery or minor trauma, but have also been reported with pterygia, vernal catarrh, pyogenic granuloma, following scleral buckling, radial keratotomy, and trabeculectomy3,6,9. Mitomycin-C is used in an effort to prevent their formation10. In examining said lesion, differential diagnoses include bullous keratopathy, neoplasm, abscess, dermoid cyst, and iris prolapse3. While our patient was Photos 3&4: 3 months post total conjunctival graft with epithelial inclusion cyst, without (above) and with NaFl stain and cobalt filter (below.) not bothered by his cyst, surgical criteria for excision would include a symptomatic patient, a cyst inducing high amounts of irregular astigmatism, lagopthalmos, or decreasing vision3,9. Management options include observation, peeling the lesion off with blunt dissection, a Yag laser, cryotherapy, or chemical cautery with trichloroacetic acid9. Additional management ideas for our patient include protective eyewear, increased viscosity artificial tears to lengthen the duration on the ocular surface, oral tetracyclines, a humidifier in the home, and flaxseed oil (1 gram orally, once daily) which is thought to yield additional benefits for his macular degeneration. Due to his history of cardiac disease, Salagen (pilocarpine) is contraindicated or used with caution. Concerning the loss of binocular vision, additional management included a discussion of driving requirements and general sensibilities if the patient were to resume driving, such as increased head movement and scanning, and cognizance of his reduced depth perception. The option of a Fresnel segment add-on or Eli Pelli lens to increase right-side visual field was discussed, but the patient declined. Finally, there is the option to trephine a window in the Gundersen flap, providing clear central vision. However, the surgeon advised against this option until a minimum of 6 months post-operatively, stating that the prognosis will worsen and repair will be more difficult if the “window” were to perforate. In Sjögren’s and other extreme dry eye patients, the risk of this happening is higher. In other comparative studies of Rheumatoid arthritis (RA,) the most common ocular manifestations include keratoconjunctivitis sicca, scleritis, and sterile corneal ulceration2, 12. Lamellar patch grafts, in particular, were preferred in one study of RA perforations because host endothelium is used, decreasing rejection rate in patients with autoimmune disease. However, Malik et. al. noted penetrating keratoplasty, glue, conjunctival recession, and lamellar keratoplasty were the most popular methods. Additionally, systemic immunosuppression was found to be most effective than steroids merely perioperatively2. This included, but was not limited to: prednisone, cyclophosphamide, methotrexate, cyclosporine, and azathioprine2. While associated with undesirable ocular side effects, long-term topical steroid use was not linked to a higher rate of keratolysis12. Despite treatment efforts, 32% of RA grafts still failed at 2 years’ time in the study by Malik et. al. and 37% of penetrating keratoplasties had failed by one year’s time in rheumatoid patients in Bernauer’s study12,13,2. In conclusion, the treatment of Sjögren’s patients is an ongoing journey of management including lubrication, immunosuppression, ocular surface and visual rehabilitation. Care should be taken to thoroughly evaluate any patient suspected of a tear deficiency disorder before refractive surgery or long-term topical NSAID use is recommended to prevent unpleasant post-operative surprises19. Good communication with these patients’ primary care physician and rheumatologist should also be maintained for optimum systemic and ocular care, because as said by Tan, “Approximately 50% of noninfectious peripheral ulcerative keratitis is associated with a systemic autoimmune disease, such as rheumatoid arthritis…and the identification of systemic disease is important because there may be a high mortality rate if not appropriately managed.20” 1. Andrean S; Puklin J. Perforated corneal ulcer with subsequent endopthalmitis in a patient with graftversus-host disease. Cornea 2007 Jan:26(1):107-8. 2. Bernauer, et al. The management of corneal perforations associated with Rheumatoid Arthritis: An analysis of 32 eyes. Ophthalmology. 1995: Sep;102(9):1325-37. 3. Cullen, CL and BH Grahn. Diagnostic ophthalmology: epithelial inclusion cyst of the right cornea. The Canadian Veterinary Journal. 2001 March; 42(3):230-231. 4. Foster, C. Stephen; Dmitri Azar, and Claes Dohlman. Smolin and Thoft’s The Cornea: Scientific foundations and clinical practice. Philadelphia: Lippincott, Williams & Wilkins, 2005. 5. Fox, R and H. Kang. “Sjögren’s Syndrome.” Textbook of Rheumatology, 4th ed. 1993:931-942. 6. Grieser et al. Long-term follow-up of free-floating epithelial inclusion cyst after radial keratotomy. Cornea. 2007 May:26(4)512-513. 7. Harris, Edward D. “Etiology and Pathogenesis of Rheumatoid Arthritis.” Textbook of Rheumatology, 4th ed. 1993:833-873. 8. Isawi, H and D. Dhaliwal. Corneal melting and perforation in Stevens Johnson syndrome following topical bromfenac use. Journal of Cataract and Refractive Surgery 2007 Sep;33(9):1644-6 9. Kiratli et al. Conjunctival epithelial inclusion cyst arising from a pterygium. Journal title? 1996: 2 pages. 10. Kothari MT, Jain S, Kothari KJ. Gian inclusion cyst of the cornea following filtering surgery. Indian Journal of Ophthalmology [serial online]2006[cited 2008 May 16];54:117-8. Available from http://www.ijo.in/text.asp?2006/54/2/117/25833 11. Lifshitz, Tova and Tzafrir Oshry. Tectonic Epikeratoplasty: A Surgical Procedure for Corneal Melting. Ophthalmic Surgery and Lasers; Jul/August 2001; 32, 305. 12. Malik, R, A.B. Culiname, D.M. Tole, S.D. Cook. Rheumatoid keratolysis: A series of 40 eyes. European Journal of Ophthalmology. 2006: 16(6)791-797. 13. Nuyts, et. al. Use of a Polyurethane Patch for Temporary Closure of a Sterile Corneal Perforation. Arch Ophthalmol 1999:117:1427-1429 14. Prydal, J.I. Use of autologous lamellar scleral patch graft to repair a corneal perforation. British Journal of Ophthalmology. 2006;900;924 15. Setlik, et. al. The Effectiveness of Isobutyl Cyanoacrylate Tissue Adhesive for the Treatment of Corneal Perforations. American Journal of Ophthalmology. 2005; 920-921. 16. Sharma, et al. Fibrin Glue Versus N-Butyl-2-Cyanoacrylate in Corneal Perforations. Ophthalmology. 2003;110(2):291-8. 17. Shigeto Simmura, J Shimazaki, and K. Tsubota. Therapeutic Deep Lamellar Keratoplasty for Cornea Perforation. American Journal of Ophthalmology. 2003 Jun; 135(6):896-7 18. Symes, et al. Corneal Perforation Associated With Pellucid Marginal Degeneration and Treatment With Crescentic Lamellar Keratoplasty: Two Case Reports. Cornea. 2007;26(5):625-8. 19. Ou, J and E Manche. Corneal Perforation After Conductive Keratoplasty in a Patient With Previously Undiagnosed Sjögren Syndrome. Archives of Ophthalmology. 2007 Aug;125(8):1131-2 20. Tan, et. al. Corneal Perforation Due to Severe Peripheral Ulcerative Keratitis in Crohn Disease. Cornea 2006 Jun;25(5):628-30. 21. Setlik, et. al. The Effectiveness of Isobutyl Cyanoacrylate Tissue Adhesive for the Treatment of Corneal Perforations. American Journal of Ophthalmology Nov 2005:920-921. 22. Taravella, M and C Chang. 2-Octyl Cyanoacrylate Medical Adhesive in Treatment of a Corneal Perforation. Cornea 2001 Mar;20(2):220-1. 23. Yeh, S and A Matoba. Successful nonsurgical management of corneal perforation in a patient with autoimmune polyendocrinopathy-Candidiasis-Ectodermal dystrophy. Cornea. 2007 Aug; 26(7):880-2