There are various ways by which eye surgeons document progression of keratoconus. Both the machines you mentioned are good. There are others as well. It is important you rely more on your eye doctor and his/ her skills rather than machines alone. Many factors are taken in consideration by your doctor rather than data from one or more machines. Maskatieyeclinic Opposite Charni Road station east, Mumbai

Hello. Ultrasound biometry is best Moreover, for keratoconus, corneal topography is also important.