Variaciones diurnas de espesor y curvatura corneal central y paracentral

  1. M.J. Giráldez-Fernández
  2. A. Díaz-Rey
  3. C. García-Resua
  4. E. Yebra-Pimentel-Vilar
Zeitschrift:
Archivos de la Sociedad Española de Oftalmologia

ISSN: 0365-6691

Datum der Publikation: 2008

Ausgabe: 83

Nummer: 3

Seiten: 183-192

Art: Artikel

DOI: 10.4321/S0365-66912008000300010 DIALNET GOOGLE SCHOLAR lock_openOpen Access editor

Andere Publikationen in: Archivos de la Sociedad Española de Oftalmologia

Zusammenfassung

Objective: Corneal topography and thickness has clinical importance in contact lens fitting and refractive surgery, however repeated measurement of corneal thickness and curvature is complicated by the natural phenomenon of diurnal variation. Our aim was determine diurnal variations of central and paracentral corneal thickness and curvature over a period of ten hours. Materials and methods: Corneal thickness and curvature of 10 right eyes of 10 young healthy men were determined by Orbscan Topography System and EyeSys videokeratoscope respectively. Both parameters were determined for central and paracentral regions 1 mm and 2 mm from the centre of the cornea at 2-hour internals for ten hours. Results: The cornea was thickest and flattest on awakening. There was a difference in corneal thickness (ANOVA, Schfféc method p< 0.05) and curvature (ANOVA, Tamhane method p< 0.05) over time for all the corneal locations studied, with greater changes observed in the peripheral corneal data. The minimum value was 10 and 8 hours after eye opening for central and paracentral zones, respectively. Change in central and paracentral corneal thickness was strongly correlated with corneal curvature, except for the 2 mm nasal and superior semi-meridians. Conclusions: These data indicate a shift in corneal thickness and curvature that can be of clinical relevance as individual changes vary greatly.

Bibliographische Referenzen

  • Brennan, NA, Coles, ML. (1997). Extended wear in perspective. Optom Vis Sci. 74. 609-623
  • Yebra-Pimentel, E, Giraldez, MJ, Gonzalez, J, Perez, MV, Parafita, M. (1998). Changes in corneal thickness after daily and extended wear of hydrogel lenses: a comparison of optical and ultrasonic pachometry. Int Contact Lens Clin. 25. 103-107
  • Pallikaris, IG, Kymionis, GD, Astyrakakis, NI. (2001). Corneal ectasia induced by laser in situ keratomileusis. J Cataract Refract Surg. 27. 1796-1802
  • Rao, SN, Epstein, RJ. (2002). Early onset ectasia following laser in situ keratomileusis: case report and literature review. J Refract Surg. 18. 177-184
  • Jonsson, M, Behndig, A. (2005). Pachymetric evaluation prior to laser in situ keratomileusis. J Cataract Refract Surg. 31. 701-706
  • Mertz, GW. (1980). Overnight swelling of the living human cornea. J Am Optom Assoc. 51. 211-214
  • Kiely, PM, Carney, LG, Smith, G. (1982). Diurnal variations of corneal topography and thickness. Am J Optom Physiol Opt. 59. 976-982
  • Holden, BA, Mertz, GW, McNally, JJ. (1983). Corneal swelling response to contact lenses worn under extended wear conditions. Invest Ophthalmol Vis Sci. 24. 218-226
  • Harper, CL, Boulton, ME, Bennet, D, Marcyniuk, B, Jarvis-Evans, JH, Tullos, AB. (1996). Diurnal variations in human corneal thickness. Br J Ophthalmol. 80. 1068-1072
  • Lattimore, MR Jr, Kaupp, S, Schallhorn, S, Lewis, R 4th. (1999). Orbscan pachymetry: implications of a repeated measures and diurnal variation analysis. Ophthalmology. 106. 977-981
  • Cronje, S, Harris, WF. (1997). Short-term keratometric variation in the human eye. Optom Vis Sci. 74. 420-424
  • Read, SA, Collins, MJ, Carney, LG. (2005). The diurnal variation of corneal topography and aberrations. Cornea. 24. 678-687
  • Handa, T, Mukuno, K, Niida, T, Uozato, H, Tanaka, S, Shimizu, K. (2002). Diurnal variation of human corneal curvature in young adults. J Refract Surg. 18. 58-62
  • Rom, ME, Keller, WB, Meyer, CJ, Meisler, DM, Chern, KC, Lowder, CY. (1995). Relationship between corneal edema and topography. CLAO J. 21. 191-194
  • Kiely, PM, Carney, LG, Smith, G. (1983). Menstrual cycle variations of corneal topography and thickness. Am J Optom Physiol Opt. 60. 822-829
  • Marsich, MW, Bullimore, MA. (2000). The repeatability of corneal thickness measures. Cornea. 19. 792-795
  • Giraldez Fernandez, MJ, Diaz Rey, A, Cerviño, A, Yebra-Pimentel, E. (2002). A comparison of two pachymetric systems: silt-scanning and ultrasonic. CLAO J. 28. 221-223
  • Cho, P, Lam, AK, Mountford, J, Ng, L. (2002). The performance of four different corneal topographers on normal human corneas and its impact on orthokeratology lens fitting. Optom Vis Sci. 79. 175-183
  • Dave, T, Ruston, D, Fowler, C. (1998). Evaluation of the EyeSys model II computerized videokeratoscope: Part I: Clinical assessment. Optom Vis Sci. 75. 647
  • Dave,, T., Ruston,, D., Fowler, C.. (1998). Evaluation of the EyeSys model II computerized videokeratoscope: Part II: The repeatability and accuracy in measuring convex aspheric surfaces. Optom Vis Sci. 75. 656-662
  • Miyata, K, Tokunaga, T, Nakahara, M, Ohtani, S, Nejima, R, Kiuchi, T. (2004). Residual bed thickness and corneal forward shift after laser in situ keratomileusis. J Cataract Refract Surg. 30. 1067-1072
  • Ozdamar, A, Kucuksumer, Y, Devranoglu, K. (2005). Flap dimensions created with the Hansatome microkeratome: correlation with Orbscan-derived anterior segment data. J Cataract Refract Surg. 31. 1614-1617
  • Spadea, L, Cerrone, L, Necozione, S, Balestrazzi, E. (2002). Flap measurements with the Hansatome microkeratome. J Refract Surg. 18. 149-154
  • Klyce, SD. (1981). Stromal lactate accumulation can account for corenal oedema osmotically following wpithelial hypoxia in the rabbit. Journal of Physiology. 321. 49-64
  • du Toit, R, Vega, JA, Fonn, D, Simpson, T. (2003). Diurnal variation of corneal sensitivity and thickness. Cornea. 22. 205-209
  • Benjamin, WJ, Rasmussen, MA. (1988). Oxygen consumption of the superior cornea following eyelid closure. Acta Ophthalmol. 66. 309-312
  • Benjamin, WJ, Ruben, CM. (1995). Human corneal oxygen demands at superior, central and inferior sites. J Am Optom Assoc. 66. 423-428
  • Erickson, P, Comstock, TL, Zantos, SG. (1996). Effects of hydrogel lens transmissibility profiles on local corneal swelling during eye closure. Optom Vis Sci. 73. 169-177
  • Odenthal, MT, Nieuwendaal, CP, Venema, HW, Oosting, J, Kok, JHC, Kijlstra, A. (1999). In vivo human corneal hydration control dynamics: a new model. Invest Ophthalmol Vis Sci. 40. 312-319
  • Buehren, T, Collins, MJ, Carney, L. (2003). Corneal aberrations and reading. Optom Vis Sci. 80. 159-166
  • Lieberman, DM, Grierson, JW. (2000). The lids influence on corneal shape. Cornea. 19. 336-342
  • MacRae, S, Rich, L, Phillips, D, Bedrossian, R. (1989). Diurnal variation in vision after radial keratotomy. Am J Ophthalmol. 107. 262-267
  • Kwitko, S, Garbus, JJ, Hwang, DG, Gauderman, WJ, McDonnell, PJ. (1992). Computer-assisted study of diurnal variation in corneal topography after penetrating keratoplasty. Ophthalmic Surg. 23. 10-16
  • Kwitko, S, Gritz, DC, Garbus, JJ, Gauderman, WJ, McDonnell, PJ. (1992). Diurnal variation of corneal topography after radial keratotomy. Arch Ophthalmol. 110. 351-356
Fuente de los datos: Dialnet