Primary pathology
| Primary pathology | CSA | Control |
| HSV | 3 | 4 |
| Other infections | 10 | 11 |
| Keratoconus and dystrophies | 4 | 7 |
| Chemical burns | 6 | 3 |
| Other inflammatory (RA, atopy, GVH, IK) | 5 | 7 |
| Endothelial failure | 15 | 10 |
| Other (mechanical trauma, aniridia) | 6 | 7 |
HSV = herpes simplex infection; RA = rheumatoid arthritis; GVH = graft versus host disease; IK = interstitial keratitis.