Placido disc is useful for detecting:: (A) Microcornea, (B) Megalocornea, (C) Corneal scars, (D) Keratoconus
Answer is D. 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