Table 1

Patterns of the proposed classification for post-keratoplasty corneas

1 Non-astigmatic corneas
2 Regular astigmatism
 (a) oval
 (b) prolate symmetric bow tie (PSBT)
 (c) prolate asymmetric bow tie (PABT)
 (d) oblate symmetric bow tie (OSBT)
 (e) oblate asymmetric bow tie (OABT)
3 Irregular astigmatism
 (a) mixed
 (b) prolate irregular (PI)
 (c) oblate irregular (OI)
 (d) “horseshoe” pattern
 (e) “triple” pattern
 (f) steep/flat (SF)
 (g) localised steep (LS)
 (h) unclassified