Comparison of the screening and diagnosis ability of the novel Scheimpflug-based tomography device (Scansys) with Pentacam and the Scheimpflug-based biomechanics device (Corvis ST) for keratoconus.

Inclusion criteria:

• Best corrected visual acuity (BCVA) ≥ 20/20;
• No other eye diseases except myopia and astigmatism;
• The cornea was transparent, and there was no cloud or pannus;

Exclusion Criteria:

• The presence of ocular diseases other than myopia and keratoconus;
• Ocular trauma;
• Previous ocular surgery;
• Patients were required to stop wearing soft contact lenses for at least 2 weeks and rigid contact lenses for at least 4 weeks before examination;
• Pregnant and lactating women;

Patients premedicated for refractive surgery