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©2013 Baishideng Publishing Group Co.
World J Ophthalmol. Aug 12, 2013; 3(3): 20-31
Published online Aug 12, 2013. doi: 10.5318/wjo.v3.i3.20
Published online Aug 12, 2013. doi: 10.5318/wjo.v3.i3.20
Table 2 Paraclinic criteria for diagnosis of keratoconus[4]
| Criteria | Values in keratoconus |
| Curvature | > 46 to 47 D |
| Asymetry I-S | > 1.4 D |
| Irregularity | > 20 or 30 degrees with respect to the vertical meridian |
| Keratometric difference between the 2 eyes | > 1 D |
| Anterior elevation | < 15 m in Placido rings images and < 12 m in Scheimpflug images |
| Posterior elevation | < 35 m in Placido rings images and < 18 m in Scheimpflug images |
| Pachymetry | Thinnest, decentered point, difference of 100 m between center and periphery |
| Aphericity (Q) | Between -0.5 and < -1 |
| Eccentricity | Approaching 1 |
| Form factor | Approaching 0 |
| Corneal irregularity | > 1.1-5 |
| Medium toric keratometry | 47.3-60 D |
| Surface irregularity index | > 1.55 |
| Predicted corneal acuity (Holladay Report) | > 0 |
| Keratoconus index (Maeda) | > 0 |
| Keratoconus % index | > 100 |
| Keratoconus prediction index | > 0.38 |
| Surface variation index | > 41 |
| Vertical asymmetry index | 0.32 |
| Keratoconus index | > 1.07 |
| Central keratoconus index | > 1.03 |
| Smallest curvature radius | > 6.71 |
| Largest asymmetry index | > 21 |
| Height decentration index | > 0.016 |
| Aberration coefficient | > 1 |
| Aberration | Vertical Coma and Coma-like RMS (> 1.5 m) |
| Corneal volume analysis | > 57.98 ± 2.65 mm3 |
| Corneal hysterisis | > 9.64 mmHg |
| Corneal resistance factor | > 9.6 mmHg |
- Citation: Jaimes M, Ramirez-Miranda A, Graue-Hernández EO, Navas A. Keratoconus therapeutics advances. World J Ophthalmol 2013; 3(3): 20-31
- URL: https://www.wjgnet.com/2218-6239/full/v3/i3/20.htm
- DOI: https://dx.doi.org/10.5318/wjo.v3.i3.20