The relationship between the cornea and the optic disc

Objective To evaluate the structural relationship between the cornea and the optic disc in normal subjects. Methods This hospital-based observational study included 205 eyes from 205 individuals who were diagnosed as normal at our glaucoma clinic. The subjects underwent an eye examination, optic disc imaging with optic disc photography, optical coherence tomography, IOL master, specular microscopy, and ultrasound corneal pachymetry. Results In univariate regression models (Pearson`s correlation coefficient), the cup-to-disc (CD) ratio showed a negative correlation with corneal curvature (r = -0.315, P < 0.001) and central corneal thickness (r = -0.206, P = 0.005), and a positive correlation with white-to-white diameter (horizontal limbus to limbus distance, r - 0.215, P - 0.003). In multiple linear regression models with CD ratio as the dependant parameter, the CD ratio was still significantly associated with corneal curvature (beta = -0.205, P = 0.011) and white-to-white diameter (beta = 0.207, P = 0.010). The central corneal thickness failed to show statistical significance, but did show a negative correlation with borderline significance (beta = -0.133, P = 0.075). Conclusions Eyes with a large CD ratio have large and flat corneas; this may suggest that there is a structural relationship between the cornea and the optic disc. These results can be helpful in analysing the anatomical relationship between the cornea and the optic disc. Eye (2010) 24, 1653-1657; doi: 10.1038/eye.2010.98; published online 23 July 2010Park SH, 2010, OPHTHALMOLOGICA, V224, P188, DOI 10.1159/000252982Jonas JB, 2009, ARCH OPHTHALMOL-CHIC, V127, P1395Cankaya AB, 2008, EUR J OPHTHALMOL, V18, P32WELLS AP, 2008, INVEST OPHTH VIS SCI, V49, P3380PARSA CF, 2008, ALBERT JACOBIECS PRI, P4271Pakravan M, 2007, BRIT J OPHTHALMOL, V91, P26, DOI 10.1136/bjo.2006.106039Oliveira C, 2007, BRIT J OPHTHALMOL, V91, P37, DOI 10.1136/bjo.2006.102061Choi HJ, 2006, J GLAUCOMA, V15, P120Jonas JB, 2005, INVEST OPHTH VIS SCI, V46, P1275, DOI 10.1167/iovs.04-0851Atchison DA, 2004, INVEST OPHTH VIS SCI, V45, P3380, DOI 10.1167/iovs.04-0292Jonas JB, 2004, INVEST OPHTH VIS SCI, V45, P2660, DOI 10.1167/iovs.03-1363Herndon LW, 2004, ARCH OPHTHALMOL-CHIC, V122, P17Jonas JB, 2003, INVEST OPHTH VIS SCI, V44, pU267Leske MC, 2003, ARCH OPHTHALMOL-CHIC, V121, P48Jonas JB, 2002, OPHTHALMOLOGY, V109, P1561Bozkurt B, 2002, CORNEA, V21, P458, DOI 10.1097/01.ICO.0000015545.84332.8DLEMPERT P, 1998, J AAPOS, V2, P207Jonas JB, 1997, OPHTHALMOLOGY, V104, P1934ARAIE M, 1994, OPHTHALMOLOGY, V101, P1440SELLHEYER K, 1988, GRAEF ARCH CLIN EXP, V226, P89JONAS JB, 1988, GRAEF ARCH CLIN EXP, V226, P213APPLE DJ, 1984, INT OPHTHALMOL CLIN, V24, P109YOUNG SE, 1976, AM J OPHTHALMOL, V82, P16LARSEN JS, 1971, ACTA OPHTHALMOL, V49, P873