Table 2.

Pre- and postoperative keratometry results of the second case.

Type	${\text{K}}_{\text{1}}(D)$	${\text{K}}_{\text{2}}(D)$	${\text{K}}_{\text{mean}}(D)$	$\mathrm{\Delta }{\text{K}}_{\text{mean}}(D)$	Errora $(\%)$
Pre (FEM)	42.63	48.32	45.48	–	0.73
Pre (clinical)	42.42	47.87	45.15	–	–
Post-Kera160-one prog segment (FEM)	42.67	46.95	44.81	− 0.9	15.27
Post-Kera160-two prog segments (FEM)	41.53	45.66	43.6	− 2.71	12.74
Post-Kera160-two segments (FEM)	39.49	44.05	41.77	− 4	8.01
Post-Kera320 (FEM)	38.5	44.25	41.38	− 4.33	7
Post-Kera355 (FEM)	38.27	43.93	41.10	− 4.61	6.28
Post-MyoRing (FEM)	38.35	41.89	40.12	− 5.59	3.7
Post-Kera355-pocket (FEM)	37.5	42.16	39.87	− 5.84	3.1
Post-MyoRing (clinical-6month)	36.36	40.99	38.67	− 6.48	-

^aPercentage error of FEM predictaed ${\text{K}}_{\text{mean}}$.