Keratoconus stage

Minimum corneal thickness

(μm)

Corneal thickness in the 7 to 10-mm zone

(μm)

Topographic indices

K1 (D)

K2 (D)

Astigmatism (D)

III

TMS-5, Tomey

Visante OCT, CZM

393 ± 24.8

365 ± 18.8

537.4 ± 24.6

525.43 ± 23.7

54.8 ± 0.9

48.9 ± 0.1

4.0 ± 0.7

IV

TMS-5, Tomey

Visante OCT, CZM

371 ± 23.8

355 ± 16.4

544.6 ± 23.6

530.44 ± 21.8

59.8 ± 5.7

54.8 ± 5.8

8.1 ± 3.8