Placido disc is useful for detecting:
Placido disc Placido disc is a type of video-keratoscopy which helps understand details about the corneal surface and anterior curvature -In normal cornea , there is no distoion of reflected pattern - In keratoconus , there is distoion of reflected pattern
Microcornea
Megalocornea
Corneal scars
Keratoconus
Optics and Errors of Refraction