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Postoperative Corneal Edema Workup

  • Author: Michael Taravella, MD; Chief Editor: John D Sheppard, Jr, MD, MMSc  more...
 
Updated: Mar 03, 2016
 

Imaging Studies

Specular microscopy

Specular microscopy represents a photographic method of assessing the endothelium in vivo. Light is projected onto the cornea, and reflected images from an optical interface (eg, endothelium, aqueous humor) can be visualized.

High magnification photographs are taken of the endothelial layer, allowing quantification of cell density. Normal cell density varies from 3000-3500 cells/mm2 in young adults to 2000-2500 cells/mm2 in older individuals. Corneas with cell densities less than 1000 cells/mm2 are at moderate-to-high risk of developing corneal edema following intraocular surgery.

Instruments digitize and analyze these photographs, assessing such parameters as the coefficient of variation and the percentage of normal hexagonal cells present. Both of these numbers represent a way of measuring polymorphism and polymegethism (ie, variation in cell size and shape) in the endothelial layer. Endothelial cells that show a great variability in size and shape are considered to be under physiologic stress and abnormal.

Besides evaluating the risk for the development of postoperative corneal edema, specular photomicrographs can be useful as a diagnostic aid to assess corneal disease states (eg, Fuchs corneal dystrophy, posterior polymorphous dystrophy). The former is associated with characteristic guttate excrescences, while the latter may show patchy areas of normal endothelium adjacent to abnormal endothelium, as well as vesicles and plaques. Fuchs dystrophy is characteristically most severe centrally with decreasing guttata density and gradually improving cell counts peripherally. Serial specular photomicrographs can be used to follow patients at risk for progressive endothelial loss, such as that occurring with vitreous prolapse into the anterior chamber with corneal touch and corneal transplant rejection episodes. See the images below.

Specular microscopy of a normal cornea. Note the c Specular microscopy of a normal cornea. Note the compact, uniform hexagonal appearance of the endothelial cells.
Specular microscopy illustrating moderate polymega Specular microscopy illustrating moderate polymegathism and polymorphism. This is thought to be evidence of endothelial physiologic stress.
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Other Tests

Ultrasound pachymetry and optical pachymetry

Both ultrasound and optical pachymetry are methods of measuring corneal thickness. Normal corneal thickness measures about 0.55 mm centrally, increasing to about 0.8 mm in the corneal periphery. Disease states resulting in corneal edema are associated with central corneal thickening as the cornea begins to swell. Corneal thicknesses above 0.6 mm centrally are suspect for corneal edema (although a small number of normal subjects may have this thickness).

Serial measurements are helpful in gauging the progression of a disease process (eg, Fuchs dystrophy), as well as in assessing a given therapeutic regimen (eg, topical steroid use in corneal graft rejection).

Ultrasonic pachymetry is more reproducible and requires less skill than optical pachymetry; optical pachymetry is especially helpful in measuring the depth of cornea pathology (eg, scars, other lesions) when the full thickness of the corneal stroma is not involved and it is necessary for therapeutic reasons to estimate the depth of this pathology (preoperative for excimer laser phototherapeutic keratectomy).

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Histologic Findings

Pathologic findings noted on corneas removed and replaced for PBK include attenuation and absence of normal endothelial cells.[36] Occasionally, evidence of preexisting endothelial dystrophy (eg, Fuchs dystrophy) may be seen. This dystrophy sometimes is missed during the preoperative exam and, as such, is associated with the development of unexpected and uncounseled postoperative corneal edema. The hallmark of this dystrophy is the finding of corneal guttate (Latin for drop) excrescences and a thickened Descemet membrane. Cornea guttate appear as excrescences extending from the Descemet membrane toward the anterior chamber.

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Contributor Information and Disclosures
Author

Michael Taravella, MD Director of Cornea and Refractive Surgery, Rocky Mountain Lions Eye Institute; Professor, Department of Ophthalmology, University of Colorado School of Medicine

Michael Taravella, MD is a member of the following medical societies: American Academy of Ophthalmology, American Medical Association, American Society of Cataract and Refractive Surgery, Contact Lens Association of Ophthalmologists, Eye Bank Association of America

Disclosure: Received none from AMO/VISX for consulting.

Coauthor(s)

Mark Walker, MD Medical Director, Laser Eye Connection

Mark Walker, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Ophthalmology, American Society of Cataract and Refractive Surgery, Contact Lens Association of Ophthalmologists

Disclosure: Nothing to disclose.

Specialty Editor Board

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

Christopher J Rapuano, MD Professor, Department of Ophthalmology, Jefferson Medical College of Thomas Jefferson University; Director of the Cornea Service, Co-Director of Refractive Surgery Department, Wills Eye Hospital

Christopher J Rapuano, MD is a member of the following medical societies: American Academy of Ophthalmology, American Ophthalmological Society, American Society of Cataract and Refractive Surgery, Contact Lens Association of Ophthalmologists, International Society of Refractive Surgery, Cornea Society, Eye Bank Association of America

Disclosure: Serve(d) as a director, officer, partner, employee, advisor, consultant or trustee for: Cornea Society, Allergan, Bausch & Lomb, Bio-Tissue, Shire, TearScience, TearLab<br/>Serve(d) as a speaker or a member of a speakers bureau for: Allergan, Bausch & Lomb, Bio-Tissue, TearScience.

Chief Editor

John D Sheppard, Jr, MD, MMSc Professor of Ophthalmology, Microbiology and Molecular Biology, Clinical Director, Thomas R Lee Center for Ocular Pharmacology, Ophthalmology Residency Research Program Director, Eastern Virginia Medical School; President, Virginia Eye Consultants

John D Sheppard, Jr, MD, MMSc is a member of the following medical societies: American Academy of Ophthalmology, American Society for Microbiology, American Society of Cataract and Refractive Surgery, Association for Research in Vision and Ophthalmology, American Uveitis Society

Disclosure: Nothing to disclose.

Additional Contributors

Richard W Allinson, MD Associate Professor, Department of Ophthalmology, Texas A&M University Health Science Center; Senior Staff Ophthalmologist, Scott and White Clinic

Richard W Allinson, MD is a member of the following medical societies: American Academy of Ophthalmology, American Medical Association, Texas Medical Association

Disclosure: Nothing to disclose.

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Pseudophakic bullous keratopathy. Large multiple bullae, such as depicted here, are associated with moderate to severe pain and discomfort.
Pseudophakic bullous keratopathy in a patient with a Binkhorst style iris-fixated lens.
Pseudophakic bullous keratopathy. This patient has a closed-loop anterior chamber intraocular lens (Leiske model).
Specular microscopy of a normal cornea. Note the compact, uniform hexagonal appearance of the endothelial cells.
Specular microscopy illustrating moderate polymegathism and polymorphism. This is thought to be evidence of endothelial physiologic stress.
Fuchs endothelial dystrophy. The apparently empty spaces are occupied by guttate.
 
 
 
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