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Patterns and Classifications in Ectatic Corneal Diseases

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Abstract

Classification of ectatic corneal diseases is important not only for diagnosis, but also for treatment planning. There are three major entities that can be differentiated in terms of morphology and tomographic features; they are keratoconus (KC), pellucid marginal degeneration (PMD), and keratoglobus (KG). In addition, there are several terms under the name of KC, such as symptomatic, asymptomatic, progressive, non-progressive, keratoconus suspect (KCS), forme fruste keratoconus (FFKC), early keratoconus, established keratoconus, and pellucid-like keratoconus (PLK). Each of these terms has its definition and criteria. Moreover, grading of the ectatic diseases is essential for treatment planning, particularly in KC and PMD. The most clinically used grading systems are Amsler-Krumeich classification and its modifications, and Belin et al. categorization. This chapter overviews the new definitions and characterizations of the ectatic disorders, including classification and grading.

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References

  1. Chan JS, Mandell RB, Burger DS, Fusaro RE. Accuracy of videokeratography for instantaneous radius in keratoconus. Optom Vis Sci. 1995;72:793–9.

    Article  CAS  PubMed  Google Scholar 

  2. Szczotka LB, Thomas J. Comparison of axial and instantaneous videokeratographic data in keratoconus and utility in contact lens curvature prediction. CLAO J. 1998;24:22–8.

    CAS  PubMed  Google Scholar 

  3. Holladay JT. Detecting Forme Fruste Keratoconus with the Pentacam. Suppl Cataract Refract Surg Today. 2008;11:12.

    Google Scholar 

  4. Rabinowitz YS. Keratoconus. Surv Ophthalmol. 1998;42:297–319.

    Article  CAS  PubMed  Google Scholar 

  5. Perry HD, Buxton JN, Fine BS. Round and oval cones in keratoconus. Ophthalmology. 1998;87(9):905–9.

    Article  Google Scholar 

  6. Armitage JA, Bruce AS, Philips AJ, Lindsay RG. Morphological variants in keratoconus: anatomical observation or etiologically significant? Aust N Z J Ophthalmol. 1998;26 Suppl 1:S68–70.

    Article  PubMed  Google Scholar 

  7. Sorbara L, Dalton K. The use of videokeratoscopy in predicting contact lens parameters for keratoconic fitting. Cont Lens Anterior Eye. 2010;33(3):112–8.

    Article  PubMed  Google Scholar 

  8. Rasheed K, Rabinowitz YS, Remba D, Remba MJ. Inter-observer and intra-observer reliability of a classification scheme for corneal topographic patterns. Br J Ophthalmol. 1998;82:1401–6.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  9. Hall JN. Inter-rater reliability of ward rating scales. Br J Psychiatry. 1974;125:248–55.

    Article  CAS  PubMed  Google Scholar 

  10. Sparrow JM, Ayliffe W, Bron A, et al. Inter-observer and intra-observer variability of the Oxford clinical cataract classification and grading system. Int Ophthalmol. 1988;11:151–7.

    Article  CAS  PubMed  Google Scholar 

  11. Ramos IC, Correa R, Guerra F, et al. Variability of subjective classifications of corneal maps from LASIK candidates. J Refract Surg. 2013;29(11):770–5.

    Article  PubMed  Google Scholar 

  12. Wilson SE, Klyce SD, Husseini ZM. Standardized color-coded maps for corneal topography. Ophthalmology. 1993;100:1723–7.

    Article  CAS  PubMed  Google Scholar 

  13. Smolek MK, Klyce SD, Hovis JK. The universal standard scale: proposed improvements to the American National Standard Institute (ANSI) scale for corneal topography. Ophthalmology. 2002;109:361–9.

    Article  PubMed  Google Scholar 

  14. Belin MW, Khachikian SS, Ambrosio R Jr. Suggested set-up and screening guidelines. In: Belin MW, Khachikian SS, Ambrosio R Jr, editors. Elevation based corneal tomography. 2nd ed. Jaypee-Highlights Medical Publisher, Inc. New Delhi, India; 2012. p. 57–69.

    Google Scholar 

  15. Ziemer Ophthalmic Systems AG. ZIEMER® GALILEI™ Software Version 5.2 Upgrade Information Package. Ziemer Ophthalmic Systems AG; 2010.

    Google Scholar 

  16. Bogan SJ, Waring III GO, Ibrahim O, et al. Classification of normal corneal topography based on computer-assisted videokeratography. Arch Ophthalmol. 1990;108(7):945–9.

    Article  CAS  PubMed  Google Scholar 

  17. Dingeldein SA, Klyce SD. The topography of normal corneas. Arch Ophthalmol. 1989;107:512–8.

    Article  CAS  PubMed  Google Scholar 

  18. Rabinowitz YS, Yang H, Brickman Y, et al. Videokeratography database of normal human corneas. Br J Ophthalmol. 1996;80(7):610–6.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  19. Abad JC, Rubinfeld RS, Valle MD, et al. Vertical D – A novel topographic in some keratoconus suspects. Ophthalmology. 2007;114(5):1020–6.

    Article  PubMed  Google Scholar 

  20. Sinjab MM. Classifications and patterns of keratoconus and keratectasia. In: Quick guide to the management of keratoconus. Heidelberg: Springer; 2012. p. 13–57.

    Chapter  Google Scholar 

  21. Litoff D, Belin MW, Winn SS, et al. PAR Technology Corneal Topography System. Investig Ophthalmol Vis Sci. 1991;32:922.

    Google Scholar 

  22. Belin MW, Litoff D, Strods SJ, et al. The PAR Technology Corneal Topography System. Refract Corneal Surg. 1992;8:88–96.

    CAS  PubMed  Google Scholar 

  23. Khachikian SS, Belin MW, Ambrosio R Jr. Normative data for the Oculus Pentacam. In: Belin MW, Khachikian SS, Ambrosio R Jr, editors. Elevation based corneal tomography. 2nd ed. Jaypee-Highlights Medical Publisher, Inc. New Delhi, India; 2012. p. 71–9.

    Google Scholar 

  24. Benes P, Synek S, Petrova S. Corneal shape and eccentricity in population. Coll Antropol. 2013;Suppl 1:117–20.

    Google Scholar 

  25. Belin MW, Khachikian SS, Ambrosio R Jr. Understanding elevation based topography: how elevation data is displayed. In: Belin MW, Khachikian SS, Ambrosio R Jr, editors. Elevation based corneal tomography. 2nd ed. Jaypee-Highlights Medical Publisher, Inc. New Delhi, India; 2012. p. 25–45.

    Google Scholar 

  26. Sinjab MM. Elevation maps. In: Corneal topography in clinical practice (Pentacam System): basics and clinical interpretation. 2nd ed. Jaypee-Highlights Medical Publisher, Inc. New Delhi, India; 2012. p. 39–50.

    Google Scholar 

  27. Krachmer JH, Feder RS, Belin MW. Keratoconus and related non-inflammatory corneal thinning disorders. Surv Ophthalmol. 1984;28:293–322.

    Article  CAS  PubMed  Google Scholar 

  28. Kennedy RH, Bourne WM, Dyer JA. A 48-year clinical and epidemiologic study of keratoconus. Am J Ophthalmol. 1986;101:267–73.

    Article  CAS  PubMed  Google Scholar 

  29. Gomes JAP, Tan D, Rapuano CJ, et al. Global consensus on keratoconus and ectatic disease. Cornea. 2015;34(4):359–69.

    Article  PubMed  Google Scholar 

  30. Zadnik K, Steger-May K, Fink BA, CLEK Study Group, et al. Between-eye asymmetry in keratoconus. Cornea. 2002;21(7):671–9.

    Article  PubMed  Google Scholar 

  31. Jones-Jordan LA, Walline JJ, Sinnott LT, et al. Asymmetry in keratoconus and vision-related quality of life. Cornea. 2013;32(3):267–72.

    Article  PubMed  PubMed Central  Google Scholar 

  32. Amsler M. Le keratocone fruste au javal. Ophthalmologica. 1938;96:77–83.

    Article  Google Scholar 

  33. Amsler M. Keratocone classique et keratocone fruste, arguments unitaires. Ophthalmologica. 1946;111:96–101.

    Article  CAS  PubMed  Google Scholar 

  34. Krumeich JH, Daniel J, Knull A. Live-epikeratophakia for keratoconus. J Cataract Refract Surg. 1998;24:456–63.

    Article  CAS  PubMed  Google Scholar 

  35. Belin MW, Kim JT, Zloty P, Ambrosio Jr R. Simplified nomenclature for describing keratoconus. Int J Kerat Ect Cor Dis. 2012;1(1):31–5.

    Google Scholar 

  36. Alio JL, Shabayek MH. Corneal high order aberrations: a method to grade keratoconus. J Refract Surg. 2006;22:539–45.

    PubMed  Google Scholar 

  37. Ishii R, Kamiya K, Igarashi A, et al. Correlation of corneal elevation with severity of keratoconus by means of anterior and posterior topographic analysis. Cornea. 2012;31(3):253–8.

    Article  PubMed  Google Scholar 

  38. WaveLight GmbH. WaveLight® Allegro Oculyzer™ 1074 User Manual (English). Erlangen: WaveLight GmbH; 2001.

    Google Scholar 

  39. Kanellopoulos AJ, Asimellis G. Revisiting keratoconus diagnosis and progression classification based on evaluation of corneal asymmetry indices, derived from Scheimpflug imaging in keratoconic and suspect cases. Clin Ophthalmol. 2013;7:1539–48.

    Article  PubMed  Google Scholar 

  40. Seiler T, Quurke AW. Iatrogenic keratectasia after LASIK in a case of forme fruste keratoconus. J Cataract Refract Surg. 1998;24:1007–9.

    Article  CAS  PubMed  Google Scholar 

  41. Schlegel Z, Hoang-xuan T, Gatinel D. Comparison of and correlation between anterior and posterior corneal elevation maps in normal eyes and keratoconus-suspect eyes. J Cataract Refract Surg. 2008;34:789–95.

    Article  PubMed  Google Scholar 

  42. Klyce SD. Chasing the suspect: keratoconus. Br J Ophthalmol. 2009;93:845–7.

    Article  PubMed  Google Scholar 

  43. Amsler M. The “forme fruste” of keratoconus (in German). Wien Klin Wochenschr. 1961;73:842–3.

    CAS  PubMed  Google Scholar 

  44. Saad A, Lteif Y, Azan E, Gatinel D. Biomechanical properties of keratoconus suspect eyes. Invest Ophthalmol Vis Sci. 2010;51(6):2912–6.

    Article  PubMed  Google Scholar 

  45. Shirayama-Suzuki M, Amano S, Honda N, et al. Longitudinal analysis of corneal topography in suspect keratoconus. Br J Ophthalmol. 2009;93:815–9.

    Article  CAS  PubMed  Google Scholar 

  46. Rabinowitz YS, McDonnell PJ. Computer-assisted corneal topography in keratoconus. Refract Corneal Surg. 1989;5:400–8.

    CAS  PubMed  Google Scholar 

  47. Szczotka LB, Rabinowitz YS, Yang H. Influence of contact lens wear on the corneal topography of keratoconus. CLAO J. 1996;22:270–3.

    CAS  PubMed  Google Scholar 

  48. Muftuoglu O, Ayar O, Hurmeric V, et al. Comparison of multimetric D index with keratometric, pachymetric, and posterior elevation parameters in diagnosing subclinical keratoconus in fellow eyes of asymmetric keratoconus patients. J Cataract Refract Surg. 2015;41:557–65.

    Article  PubMed  Google Scholar 

  49. Saad A, Gatinel D. Topographic and tomographic properties of forme fruste keratoconus corneas. Invest Ophthalmol Vis Sci. 2010;51:5546–55.

    Article  PubMed  Google Scholar 

  50. Li X, Yang H, Rabinowitz YS. Keratoconus: classification scheme based on Videokeratography and clinical signs. J Cataract Refract Surg. 2009;35(9):1597–603.

    Article  PubMed  PubMed Central  Google Scholar 

  51. Li X, Rabinowitz YS, Rasheed K, Yang H. Longitudinal study of the normal eyes in unilateral keratoconus patients. Ophthalmology. 2004;111(3):440–6.

    Article  PubMed  Google Scholar 

  52. Waring GO, Rabinowitz YS, Sugar J, Damiano R. Nomenclature for keratoconus suspects. Refract Corneal Surg. 1993;9(3):219–22.

    Google Scholar 

  53. Lim L, Wei RH, Chan WK, Tan DT. Evaluations of keratoconus in Asians: role of Orbscan II and Tomey TMS-2 corneal topography. Am J Ophthalmol. 2007;143:390–400.

    Article  PubMed  Google Scholar 

  54. Klyce SD, Smolek MK, Maeda N. Keratoconus detection with the KISA% method-another view. J Cataract Refract Surg. 2000;26:472–4.

    Article  CAS  PubMed  Google Scholar 

  55. Rabinowitz YS, Nesburn AB, McDonnell PJ. Videokeratography of the fellow eye in unilateral keratoconus. Ophthalmology. 1993;100:181–6.

    Article  CAS  PubMed  Google Scholar 

  56. Rabinowitz YS, Rasheed K. KISA% index: a quantitative videokeratography algorithm embodying minimal topographic criteria for diagnosing keratoconus. J Cataract Refract Surg. 1999;25:1327–35.

    Article  CAS  PubMed  Google Scholar 

  57. Rao SN, Raviv T, Majmudar PA, Epstein RJ. Role of Orbscan II in screening keratoconus suspects before refractive corneal surgery. Ophthalmology. 2002;109:1642–6.

    Article  PubMed  Google Scholar 

  58. Mahon L, Kent D. Can true monocular keratoconus occur? Clin Exp Optom. 2004;87:126; author reply 126.

    Article  PubMed  Google Scholar 

  59. Muftuoglo O, Ayar O, Ozulken K, et al. Posterior corneal elevation and back difference corneal elevation in diagnosing forme fruste keratoconus in the fellow eyes of unilateral keratoconus patients. J Cataract Refract Surg. 2013;39:1348–57.

    Article  Google Scholar 

  60. Rabinowitz YS, Rasheed K, Yang H, Elashoff J. Accuracy of ultrasonic pachymetry and videokeratography in detecting keratoconus. J Cataract Refract Surg. 1998;24(2):196–201.

    Article  CAS  PubMed  Google Scholar 

  61. Nilforoushan MR, Speaker M, Marmor M. Comparative evaluation of refractive surgery candidates with Placido topography, Orbscan II, Pentacam, and wavefront analysis. J Cataract Refract Surg. 2008;34:623–31.

    Article  PubMed  Google Scholar 

  62. Schweitzer C, Roberts CJ, Mahmoud AM, et al. Screening of forme fruste keratoconus with the ocular response analyzer. Invest Ophthalmol Vis Sci. 2010;51:2403–10.

    Article  PubMed  Google Scholar 

  63. Buhren J, Kuhne C, Kohnen T. Wavefront analysis for the diagnosis of subclinical keratoconus (in German). Ophthalmologe. 2006;103:783–90.

    Article  CAS  PubMed  Google Scholar 

  64. Buhren J, Kuhne C, Kohnen T. Defining subclinical keratoconus using corneal first-surface higher-order aberrations. Am J Ophthalmol. 2007;143:381–9.

    Article  PubMed  Google Scholar 

  65. Rabinowitz YS. Videokeratographic indices to aid in screening for keratoconus. J Refract Surg. 1995;11(5):371–9.

    CAS  PubMed  Google Scholar 

  66. Rabinowitz YS, Li X, Canedo ALC, et al. Optical coherence tomography (OCT) combined with videokeratography to differentiate mild keratoconus subtypes. J Refract Surg. 2014;30(2):80–7.

    Article  PubMed  PubMed Central  Google Scholar 

  67. Li Y, Shekhar R, Huang D. Corneal pachymetry mapping with high-speed optical coherence tomography. Ophthalmology. 2006;113(5):792–9.

    Article  PubMed  PubMed Central  Google Scholar 

  68. Li Y, Tang M, Zhang X, et al. Pachymetric mapping with Fourier domain optical coherence tomography. J Cataract Refract Surg. 2010;36(5):826–31.

    Article  PubMed  PubMed Central  Google Scholar 

  69. Buhren J, Kook D, Yoon G, Kohnen T. Detection of subclinical keratoconus by using corneal anterior and posterior surface aberrations and thickness spatial profiles. Invest Ophthalmol Vis Sci. 2010;51:3424–32.

    Article  PubMed  Google Scholar 

  70. Saad A, Gatinel D. Evaluation of total and corneal wavefront high order aberrations for the detection of forme fruste keratoconus. Invest Ophthalmol Vis Sci. 2012;53:2978–92.

    Article  PubMed  Google Scholar 

  71. Maeda N, Klyce SD, Smolek MK, Thompson HW. Automated keratoconus screening with corneal topography analysis. Invest Ophthalmol Vis Sci. 1994;35:2749–57.

    CAS  PubMed  Google Scholar 

  72. Arbelaez MC, Versaci F, Vestri G, et al. Use of a support vector machine for keratoconus and subclinical keratoconus detection by topographic and tomographic data. Ophthalmology. 2012;119(11):2231–8.

    Article  PubMed  Google Scholar 

  73. Smadja D, Touboul D, Cohen A, et al. Detection of subclinical keratoconus using an automated decision tree classification. Am J Ophthalmol. 2013;156:237–46.

    Article  PubMed  Google Scholar 

  74. Belin MW, Khachikian SS. Keratoconus: it’s hard to define but…. Am J Ophthalmol. 2007;43(3):500–3.

    Article  Google Scholar 

  75. Sridhar MS, Mahesh S, Bansal AK, et al. Pellucid marginal corneal degeneration. Ophthalmology. 2004;111:1102–7.

    Article  CAS  PubMed  Google Scholar 

  76. Krachmer JH. Pellucid marginal corneal degeneration. Arch Ophthalmol. 1978;96:1217–21.

    Article  CAS  PubMed  Google Scholar 

  77. Robin JB, Schanzlin DJ, Verity SM, et al. Peripheral corneal disorders. Surv Ophthalmol. 1986;31:1–36.

    Article  CAS  PubMed  Google Scholar 

  78. Romero-Jimenez M, Santodomingo-Rubido J, Wolffsohn JS. Keratoconus: a review. Contact Lens Ant Eye. 2010;33:157–66.

    Article  Google Scholar 

  79. Jinabhai A, Radhakrishnan H, O’Donnell C. Pellucid corneal marginal degeneration: a review. Contact Lens Ant Eye. 2011;34:56–63.

    Article  Google Scholar 

  80. Tzelikis PF, Cohen EJ, Rapuano CJ, et al. Management of pellucid marginal corneal degeneration. Cornea. 2005;24:555–60.

    Article  PubMed  Google Scholar 

  81. Kompella VB, Aasuri MK, Rao GN. Management of pellucid marginal corneal degeneration with rigid gas permeable contact lenses. CLAO J. 2002;28:140–5.

    PubMed  Google Scholar 

  82. Mularoni A, Torreggiani A, di Biase A, et al. Conservative treatment of early and moderate pellucid marginal degeneration: a new refractive approach with intracorneal rings. Ophthalmology. 2005;112:660–6.

    Article  PubMed  Google Scholar 

  83. Taglia DP, Sugar J. Superior pellucid marginal corneal degeneration with hydrops. Arch Ophthalmol. 1997;115:274–5.

    Article  CAS  PubMed  Google Scholar 

  84. Gruenauer-Kloevekorn C, Fischer U, Kloevekorn-Norgall K, Duncker GIW. Pellucid marginal corneal degeneration: evaluation of the corneal surface and contact lens fitting. Br J Ophthalmol. 2006;90:318–23.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  85. Rasheed K, Rabinowitz YS. Surgical treatment of advanced pellucid marginal degeneration. Ophthalmology. 2000;107:1836–40.

    Article  CAS  PubMed  Google Scholar 

  86. Karabatsas CH, Cook SD. Topographic analysis in pellucid marginal corneal degeneration and keratoglobus. Eye. 1996;10(Pt 4):451–5.

    Article  PubMed  Google Scholar 

  87. Lee BW, Jurkunas UV, Harissi-Dagner M, et al. Ectatic disorders associated with a claw-shaped pattern on corneal topography. Am J Ophthalmol. 2007;144(1):154–6.

    Article  PubMed  Google Scholar 

  88. Walker RN, Khachikian SS, Belin MW. Scheimpflug imaging of pellucid marginal degeneration. Cornea. 2008;27(8):963–6.

    Article  PubMed  Google Scholar 

  89. Belin MW, Khachikian SS. An introduction to understanding elevation based topography: how elevation data are displayed – a review. Clin Experiment Ophthalmol. 2009;37(1):14–29.

    Article  PubMed  Google Scholar 

  90. Belin MW, Asota IM, Ambrosio Jr R, Khachikian SS. What’s in a name of: keratoconus, pellucid marginal degeneration, and related thinning disorders. Am J Ophthalmol. 2011;152:157–62.

    Article  PubMed  Google Scholar 

  91. Sinjab MM, Youssef LN. Pellucid-like keratoconus. Available on: www.ncbi.nlm.nih.gov/pmc/articles/PMC3752625.

  92. Maguire LJ, Klyce SD, McDonald MB, Kaufman HE. Corneal topography of pellucid marginal degeneration. Ophthalmology. 1987;94:519–24.

    Article  CAS  PubMed  Google Scholar 

  93. Tummanapalli SS, Maseedupally V, Mandathara P, et al. Evaluation of corneal elevation and thickness indices in pellucid marginal degeneration and keratoconus. J Cataract Refract Surg. 2013;39:56–65.

    Article  PubMed  Google Scholar 

  94. Verrey K. Keratoglobe aigu. Ophthalmologica. 1947;114:284–8.

    Article  Google Scholar 

  95. Cavara V. Keratoglobus and keratoconus: a contribution to the nosological interpretation of keratoglobus. Br J Ophthalmol. 1950;34:621–6.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  96. Pouliquen Y, Dhermy P, Espinasse MA, Savoldelli M. Keratoglobus. J Fr Ophthalmol. 1985;8(1):43–5.

    CAS  Google Scholar 

  97. Gregoratos ND, Bartsocas CS, Papas K. Blue sclerae with keratoglobus and brittle cornea. Br J Ophthalmol. 1971;55(6):424–6.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  98. Cameron JA. Keratoglobus. Cornea. 1993;12(2):124–30.

    Article  CAS  PubMed  Google Scholar 

  99. Cameron JA, Al-Rajhi AA, Badr IA. Corneal ectasia in vernal keratoconjunctivitis. Ophthalmology. 1989;96(11):1615–23.

    Article  CAS  PubMed  Google Scholar 

  100. Wallang BS, Das S. Keratoglobus. Eye. 2013;27(9):1004–12.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  101. Moshirfar M, Edmonds JN, Behunin NL, Christiansen SM. Current options in the management of pellucid marginal degeneration. J Refract Surg. 2014;30(7):474–85.

    Article  PubMed  Google Scholar 

  102. Baillif S, Garweg JG, Grange JD, et al. Keratoglobus: review of the literature. J Fr Ophthalmol. 2005;28:1145–9.

    Article  CAS  Google Scholar 

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  1. Ophthalmology Department, Damascus University, Damascus, Syria

    Mazen M. Sinjab MD, MSc, ABOphth, PhD, FRCOphth

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  1. Ophthalmology Department, Damascus University, Damascus, Saudi Arabia

    Mazen M. Sinjab

  2. Wellington Eye Clinic, Dublin, Ireland

    Arthur B. Cummings

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Sinjab, M.M. (2017). Patterns and Classifications in Ectatic Corneal Diseases. In: Sinjab, M., Cummings, A. (eds) Corneal Collagen Cross Linking. Springer, Cham. https://doi.org/10.1007/978-3-319-39775-7_2

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